Ophthalmology Nursing – GCC Advanced Guide

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Anterior Segment Anatomy

Structures (front of lens)

Cornea – avascular, transparent; 5 layers (epithelium, Bowman's, stroma, Descemet's, endothelium); provides ~70% refractive power
Sclera – white fibrous coat; attachment for extraocular muscles
Limbus – corneoscleral junction; site of stem cells; aqueous drainage (trabecular meshwork)
Anterior chamber – contains aqueous humour; depth ~3.5 mm
Iris – pigmented diaphragm; controls pupil size (mydriasis/miosis)
Pupil – aperture; normal 2–6 mm in light
Ciliary body – produces aqueous; contains ciliary muscle (accommodation)
Lens – biconvex; suspended by zonules; provides ~30% refractive power; avascular

Aqueous Humour Pathway

Produced by ciliary body → posterior chamber → through pupil → anterior chamber → trabecular meshwork → Schlemm's canal → episcleral veins

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Posterior Segment Anatomy

Structures (behind lens)

Vitreous humour – gel-like; 80% of eye volume; 99% water + hyaluronic acid; decreases with age (syneresis)
Retina – 10 layers; contains photoreceptors (rods: peripheral/dim light; cones: central/colour)
Macula – central 5 mm; responsible for detailed central vision; contains fovea centralis (highest cone density)
Optic disc – blind spot; no photoreceptors; nerve fibres exit; cup:disc ratio normally ≤0.5
Choroid – vascular layer between retina and sclera; provides outer retinal nutrition
Central retinal artery/vein – main blood supply; enters/exits at optic disc

Clinical Pearl

The fovea centralis has NO blood vessels — it is nourished by the choriocapillaris. This is why subretinal neovascularisation in AMD causes such devastating central visual loss.

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Visual Acuity Testing – Snellen Chart

Standard Testing

Distance: 6 metres (20 feet)
Test each eye separately; record with/without correction
Normal: 6/6 (20/20)
If unable to read top line: count fingers (CF), hand movements (HM), light perception (LP), no light perception (NLP)

Snellen Notation

Notation	Meaning
6/6	Normal
6/12	Reads at 6m what normal reads at 12m
6/60	Severe impairment
3/60	Legally blind (UK/GCC)
CF, HM	No chart readable

Pinhole Test

If VA improves with pinhole → refractive error (correctable). If no improvement → media opacity or retinal/neurological cause.

Near Vision

Jaeger chart at 30 cm. Presbyopia (>45 yrs) affects near vision first.

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Pupil Assessment – PERLA

Pupils Equal and Reactive to Light and Accommodation

Finding	Significance
PERLA 4mm	Normal
Mydriasis (dilated)	Sympathetic stimulation, CN III palsy, atropine, angle-closure glaucoma
Miosis (constricted)	Parasympathetic, opioids, Horner syndrome, pilocarpine use
Anisocoria >1mm	Pathological: CN III palsy, Horner, trauma, drugs
RAPD (Marcus Gunn)	Optic nerve disease, large retinal lesion
Fixed dilated pupil	Emergency: herniation, or post mydriatic drops

Swinging Flashlight Test

RAPD: when light swings to affected eye, both pupils dilate (paradoxical). Indicates afferent pathway deficit (optic nerve/retinal disease).

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Visual Fields Testing

Confrontation test – bedside screening; patient covers one eye, compares fields with examiner
Humphrey visual field analyser – automated static perimetry; gold standard for glaucoma monitoring
Goldmann perimetry – kinetic; useful in neurological defects

Field Defect Localisation

Defect Pattern	Location
Central scotoma	Macula / optic nerve
Altitudinal defect	BRAO, ischaemic optic neuropathy
Bitemporal hemianopia	Optic chiasm (pituitary)
Homonymous hemianopia	Optic tract / cortex (stroke)
Arcuate scotoma	Glaucoma (nerve fibre bundle)

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Intraocular Pressure (IOP)

10–21

Normal IOP (mmHg)

>21

Ocular Hypertension

>30

Acute Glaucoma Risk

Goldmann Applanation Tonometry (GAT)

Gold standard for IOP measurement
Applied to anaesthetised cornea (fluorescein + proxymetacaine)
Measures force to flatten 3.06 mm area of cornea
Affected by central corneal thickness (CCT) — thin cornea underestimates IOP
Non-contact tonometry (air puff): screening only; less accurate
iCare rebound tonometry: no anaesthesia needed; useful in children

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Slit-Lamp & Fundoscopy

Slit-Lamp Examination

Binocular microscope + adjustable light beam
Examines: eyelids, conjunctiva, cornea, anterior chamber, iris, lens
Cells and flare in AC = intraocular inflammation (uveitis)
Keratic precipitates (KPs) = inflammatory cells on endothelium
With 78D/90D lens: posterior pole, disc, macula

Direct Fundoscopy Findings

Normal disc: pink, sharp margins, cup:disc ≤0.5
Papilloedema: swollen disc, blurred margins, raised ICP
Diabetic changes: microaneurysms, haemorrhages, exudates, new vessels
Hypertensive changes: AV nicking, silver/copper wiring, flame haemorrhages
CRVO: 'stormy sunset' – extensive flame haemorrhages all quadrants

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Red Eye – Differential Diagnosis

Condition	Pain	Vision	Discharge	Pupil	IOP	Priority
Bacterial conjunctivitis	Gritty	Normal	Purulent	Normal	Normal	Routine
Viral conjunctivitis	Gritty	Normal	Watery	Normal	Normal	Routine
Allergic conjunctivitis	Itch	Normal	Mucoid	Normal	Normal	Routine
Corneal ulcer	Severe	Reduced	+/-	Normal	Normal	Urgent
Anterior uveitis (iritis)	Aching	Blurred	None	Small/irregular	Varies	Urgent
Acute angle-closure glaucoma	Severe + nausea	Halos/loss	None	Fixed mid-dilated	Very high	EMERGENCY
Scleritis	Deep boring	Normal/reduced	None	Normal	Normal	Urgent
Chemical injury	Severe	Reduced	Tearing	Varies	Varies	EMERGENCY

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Cataract

Definition

Opacification of the crystalline lens. Most common cause of reversible blindness worldwide.

LOCS III Grading System

Type	Location	Grade
Nuclear (NC/NO)	Lens nucleus	1–5 (colour/opalescence)
Cortical (C)	Lens cortex	0.1–5
Posterior Subcapsular (P)	Posterior capsule	0.1–5

Symptoms by Type

Nuclear: gradual blur, myopic shift ("second sight"), glare, worse in bright light
Posterior subcapsular: worse near vision, severe glare/halos (common in diabetics, steroids)
Cortical: glare, monocular diplopia

Risk Factors

Age (most common), UV exposure (high in GCC), diabetes, corticosteroids, trauma, smoking
GCC: outdoor workers, high UV index — earlier presentation common

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Glaucoma

Definition

Progressive optic neuropathy with characteristic optic disc cupping and visual field loss. IOP is a major risk factor.

Open-Angle (POAG)

Chronic, painless, insidious
Peripheral VF loss first
Trabecular meshwork obstruction
Most common type (90%)
IOP often elevated
Normal tension glaucoma: IOP ≤21 but damage occurs

Angle-Closure (AACG)

Acute or chronic
Iris blocks trabecular meshwork
Hypermetropic eyes (shorter axial length)
Sudden severe pain, halos, N&V
EMERGENCY (see Tab 3)
Prophylactic PI other eye

Optic Disc Changes

Increased cup:disc ratio (>0.6 suspicious, >0.8 highly suggestive)
Notching of rim (inferior > superior > nasal > temporal = ISNT rule reversal)
Disc haemorrhages (Drance haemorrhages) – NTG marker
Nasal shifting of vessels, bayoneting sign

VF Loss Patterns

Paracentral scotoma → arcuate (Bjerrum) scotoma → nasal step → tubular/tunnel vision → total loss

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Age-Related Macular Degeneration (AMD)

Dry AMD (Atrophic) – 85% of cases

Drusen: extracellular deposits between RPE and Bruch's membrane
Hard drusen: small, discrete, lower risk
Soft drusen: large, confluent, higher risk of progression
Geographic atrophy: RPE cell death, permanent central loss
Gradual, painless central visual loss
No treatment (AREDS2 supplements may slow progression)

AREDS2 Supplements

Vitamin C 500mg, Vitamin E 400IU, Lutein 10mg, Zeaxanthin 2mg, Zinc 80mg, Copper 2mg. Reduces risk of progression by ~25% in intermediate/advanced AMD.

Wet AMD (Neovascular) – 15% but 90% of severe loss

Choroidal neovascularisation (CNV) breaks through Bruch's membrane
New vessels leaky → subretinal fluid, haemorrhage, exudates
Rapid central vision loss; metamorphopsia (distortion)
Amsler grid: straight lines appear wavy/missing
Treatment: Anti-VEGF injections (ranibizumab, aflibercept, bevacizumab)
OCT: key monitoring tool (SRF, IRF)

Amsler Grid Monitoring

All AMD patients should self-monitor with Amsler grid daily. New distortion or missing squares = urgent referral within 24–48 hours for wet AMD assessment.

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Diabetic Retinopathy

GCC Alert – High Prevalence

GCC countries have among the world's highest rates of type 2 diabetes (UAE ~19%, Saudi Arabia ~18%, Kuwait ~23%). Diabetic retinopathy is the leading cause of preventable blindness in working-age adults in the region.

Non-Proliferative DR (NPDR)

Grade	Features
Mild	Microaneurysms only
Moderate	MA + dot/blot haemorrhages, hard exudates, cotton-wool spots
Severe	4-2-1 rule: haem in 4 quadrants, VB in 2 quads, IRMA in 1 quad
Very Severe	Two or more of above

Proliferative DR (PDR)

New vessels on disc (NVD) or elsewhere (NVE)
Vitreous/preretinal haemorrhage
Tractional retinal detachment
Rubeosis iridis (neovascular glaucoma)
Treatment: panretinal photocoagulation (PRP), Anti-VEGF, vitrectomy

Diabetic Macular Oedema (DMO)

Can occur at any DR stage
Clinically significant: hard exudates within 500μm of fovea
OCT-based: centre-involving CMO
Treatment: Anti-VEGF (first line), laser, steroid implants

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Retinal Detachment

EMERGENCY – Same Day Referral

Any suspected retinal detachment, especially macula-on, requires same-day emergency assessment. Vision may be salvaged if macula attached.

Types

Rhegmatogenous (most common): break/tear → fluid under retina. Myopia, trauma, post-cataract surgery, vitreous detachment
Tractional: proliferative membranes pull retina (PDR, sickle cell)
Exudative: fluid from choroidal tumour/inflammation; no break

Classic Symptoms (Rhegmatogenous)

Photopsia (flashes) – vitreous traction on retina
Floaters (shower of spots) – pigment cells or blood in vitreous
Visual field defect ("curtain" or "shadow" from periphery)
Sudden painless vision loss if macula detached

Risk Factors

High myopia (>6 dioptres), prior cataract surgery, trauma, family history, lattice degeneration, fellow eye RD

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Corneal Ulcer & Uveitis

Corneal Ulcer

Bacterial (Pseudomonas common in contact lens wearers), fungal, Acanthamoeba, viral (HSV dendritic ulcer)
Symptoms: severe pain, photophobia, foreign body sensation, discharge, reduced VA
Corneal staining with fluorescein under blue light confirms epithelial defect
Contact lens wearers: remove lens immediately; urgent corneal scrape for culture
Treatment: intensive topical antibiotics (hourly initially), cycloplegics for pain
HSV: topical acyclovir (NOT steroids in epithelial disease)

Uveitis (Anterior – Iritis)

Inflammation of uveal tract; anterior = iris + ciliary body
Symptoms: deep aching pain, photophobia, blurred vision, lacrimation, red eye (ciliary flush)
Slit-lamp: cells & flare in AC, KPs on endothelium, posterior synechiae
Causes: idiopathic, HLA-B27 conditions (AS, Reiter's), sarcoid, Behcet's, infections (TB, syphilis)
GCC: Behcet's disease prevalence higher; TB-associated uveitis important differential
Treatment: topical steroids, cycloplegics; systemic if posterior involvement

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GCC-Specific Ophthalmology

Consanguinity-Related Conditions

Retinitis Pigmentosa (RP) – autosomal recessive common; night blindness, tunnel vision, bone spicule pigmentation
Leber Congenital Amaurosis – severe early-onset inherited retinal dystrophy
Familial exudative vitreoretinopathy
Various forms of congenital cataracts and glaucoma
Genetic counselling recommended in GCC high consanguinity regions

Trachoma History in GCC

Chlamydia trachomatis bacterial infection
Historically prevalent in GCC; now eliminated/near-eliminated
WHO SAFE strategy: Surgery, Antibiotics, Face washing, Environmental improvement
Complications: trichiasis (lashes in-turned), corneal scarring, blindness
Treatment: azithromycin mass drug administration

High-Prevalence Conditions in GCC

Diabetic retinopathy – top cause preventable blindness
Pterygium – UV-related conjunctival overgrowth; surgical excision
Dry eye disease – high in air-conditioned environments
Nuclear cataracts – UV-related, younger presentation
Keratoconus – higher prevalence, often familial, associated with eye rubbing

Ophthalmic Emergencies – Time is Vision

All emergencies in this section require immediate escalation. Nurses must know the initial management steps and which interventions take priority before the ophthalmologist arrives.

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Acute Angle-Closure Glaucoma (AACG)

Presentation

Sudden onset severe unilateral eye pain
Headache, nausea, vomiting (may mimic migraine/GI emergency)
Coloured halos around lights
Reduced vision, cloudy/steamy cornea
Red eye (ciliary flush)
Fixed mid-dilated pupil (4–6mm, oval, non-reactive)
IOP dramatically elevated (often 40–80 mmHg)
Rock-hard eyeball on gentle palpation

Precipitating Factors

Dim lighting (pupil dilates)
Emotional stress
Anticholinergic medications (antihistamines, TCAs)
Hypermetropic females >50 years

Emergency Management

Immediate ophthalmology referral — do not delay
Supine position initially; may help lens fall back
IV Acetazolamide 500mg (carbonic anhydrase inhibitor) — reduces aqueous production
Topical pilocarpine 2–4% to affected eye (miotic — opens drainage angle)
Topical beta-blocker (timolol 0.5%) to lower IOP
IV mannitol 20% (1–2 g/kg) if IOP remains very high
Antiemetics (nausea impairs drop absorption, compliance)
Analgesia for pain relief
Definitive: Laser peripheral iridotomy (LPI) — creates hole in peripheral iris to restore aqueous flow
Fellow eye: prophylactic LPI (bilateral predisposition)

Nursing Priority

Do NOT give pilocarpine to the fellow eye unless directed by ophthalmologist. Ensure IV access and accurate medication documentation.

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Chemical Eye Injury

IRRIGATION FIRST – DO NOT DELAY

Copious irrigation takes absolute priority over everything else — before history, before examination, before any other treatment. Every second counts, especially with alkali burns.

Alkali vs Acid Burns

Feature	Alkali	Acid
Examples	Ammonia, bleach, cement, lime	Battery acid, vinegar, pool chemicals
Mechanism	Liquefactive necrosis – penetrates deeply	Coagulative necrosis – self-limiting
Severity	Worse	Less severe
Penetration	Through cornea into AC	Superficial layers
pH target	Normal: 7.0–7.4

Roper-Hall Classification

Grade I: Corneal epithelial damage only; good prognosis
Grade II: Corneal haze, <1/3 limbal ischaemia; good prognosis
Grade III: 1/3–1/2 limbal ischaemia; guarded prognosis
Grade IV: >1/2 limbal ischaemia; very poor prognosis

Irrigation Protocol

Remove contact lens immediately if present
Irrigate with normal saline or Ringer's lactate — at least 2 litres
Use Morgan lens for continuous irrigation
Evert eyelids and irrigate fornices
Remove any particulate matter (e.g. cement particles) with wet swab
Check pH with litmus paper after 5 minutes of irrigation
Continue until pH 7.0–7.4 maintained for 30 minutes
Document time, agent, volume irrigated

Post-Irrigation Management

Topical antibiotics, cycloplegics for pain
Ascorbate drops/oral Vitamin C (alkali burns)
Topical steroids in first week to reduce inflammation
IOP monitoring (can rise acutely post-chemical injury)

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Central Retinal Artery Occlusion (CRAO)

STROKE EQUIVALENT – Time Critical

CRAO is a "brain attack" of the eye. Window for intervention: ≤90 minutes (ideally). Treat as stroke protocol — urgent neurovascular assessment.

Presentation

Sudden, painless, profound unilateral visual loss
VA may be CF or LP only
Relative afferent pupillary defect (RAPD)
Fundoscopy: pale/white retina, cherry-red spot at macula (choroidal circulation preserved)
Attenuated retinal arteries
Risk factors: AF, carotid stenosis, hypertension, giant cell arteritis

Acute Management

Ocular massage (10 seconds on, 10 off) — dislodge embolus
IOP lowering: IV acetazolamide, anterior chamber paracentesis
Rebreathing CO2 (carbogen) — dilates retinal vessels
Urgent thrombolysis consideration (if within 4.5h) — stroke team
ESR/CRP: exclude giant cell arteritis (immediate prednisolone if suspected)

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Penetrating Eye Injury

DO NOT REMOVE THE OBJECT

Never attempt to remove a penetrating foreign body. Do not apply pressure to the eye. Rigid eye shield (Fox shield) only.

Immediate Nursing Actions

Apply rigid eye shield (Fox shield) — NOT cotton wool pad
Nil by mouth (NPO) — urgent surgery required
IV access, analgesia (avoid NSAIDS — increase bleeding risk)
Antiemetics — vomiting increases IOP and risk of extrusion
IV antibiotics (endophthalmitis prophylaxis)
Tetanus prophylaxis
Plain CT orbits (no MRI if metallic FB)
Urgent ophthalmology and theatre notification

Seidel Test

Fluorescein strip over wound — if aqueous leaks, dark stream visible through orange dye (positive Seidel). Confirms open globe. Do not manipulate.

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Hyphaema Management

Definition & Classification

Blood in the anterior chamber, usually following blunt or penetrating trauma.

Grade	Blood in AC
0 (microhyphaema)	RBC without layering
I	<1/3 of AC
II	1/3–1/2 of AC
III	>1/2 of AC
IV ("8-ball")	Total – black/dark red

Management

Bed rest with head elevated 30–45 degrees
Protective eye shield
No aspirin/NSAIDs — risk of rebleed
Topical steroids to reduce inflammation
Cycloplegics (reduce ciliary spasm/pain)
IOP monitoring — clot can block trabecular meshwork
Oral aminocaproic acid (antifibrinolytic — reduces rebleed risk)

Rebleed Risk

Peak risk: days 3–5 post-injury. Rebleed often more severe than initial bleed. Sickle cell patients: avoid IOP >24 mmHg (sickled cells block meshwork).

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Pre-operative Assessment – Ophthalmic Surgery

Nursing Assessment Checklist

Baseline visual acuity (each eye separately)
IOP measurement and recording
Allergy history (especially drops, latex, iodine/povidone)
Current medications: identify anticoagulants (warfarin, NOACs), antiplatelets (aspirin, clopidogrel)
Diabetic patients: blood glucose target <10 mmol/L pre-op; insulin adjustment
Blood pressure: hypertension can cause expulsive haemorrhage; target <160/90
Systemic conditions: COPD (beta-blocker drops contraindicated), cardiac disease
Confirm correct eye marked and documented (WHO surgical safety checklist)
Pre-operative drops given as prescribed (dilating drops, antibiotic cover)
NPO status for GA; topical anaesthesia most cataract surgery = no NPO required
Biometry measurements reviewed (IOL power calculation)

Anti-coagulation Guidance

Medication	Action
Aspirin	Usually continue for cataract; stop 7 days for vitreoretinal
Warfarin	Check INR <3.0; often continued for local anaesthesia cases
NOACs (rivaroxaban, apixaban)	Withhold per protocol; consult haematology/cardiology
Clopidogrel	Consult prescriber; cardiac stent patients high risk to stop

WHO Checklist

Always verify: correct patient, correct eye (laterality), correct procedure, correct IOL power (cataract). Sign-in, time-out, sign-out mandatory.

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Cataract Surgery Nursing

Phacoemulsification Procedure

Small incision (2–3mm) — self-sealing, no sutures usually
Phaco probe: ultrasound breaks up lens nucleus (emulsification)
Cortex removed by irrigation/aspiration
Posterior capsule preserved (bag) for IOL support
Foldable intraocular lens (IOL) inserted into capsular bag
Viscoelastic removed at end
Duration: ~15–20 minutes; topical/local anaesthesia

IOL Types

Monofocal: one focus distance; most common; spectacles for near
Multifocal: near and distance; halos/glare possible
Toric: for astigmatism correction
Extended Depth of Focus (EDOF): intermediate range added

Post-operative Drop Regimen (Standard)

Drop	Class	Duration	Frequency
Dexamethasone 0.1%	Steroid	4 weeks	4x/day tapering
Chloramphenicol 0.5%	Antibiotic	2 weeks	4x/day
Ketorolac/Diclofenac	NSAID	4 weeks	3–4x/day

Post-op Instructions

Wear shield at night (4 weeks)
No rubbing; no swimming (4 weeks)
No heavy lifting/straining (2 weeks)
Avoid bending below waist acutely
New spectacles prescribed after 4–6 weeks
Return immediately: sudden pain, reduced vision, flashing lights

Endophthalmitis – Post-op Emergency

Signs (days 1–7 post-op): increasing eye pain, reduced vision, hypopyon (pus in AC), lid swelling, discharge. IMMEDIATE ophthalmology referral. Treatment: intravitreal vancomycin + ceftazidime injection.

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Vitreoretinal Surgery Nursing

Common Procedures

Pars plana vitrectomy (PPV): remove vitreous gel; treat retinal detachment, macular hole, ERM, vitreous haemorrhage
Scleral buckle: silicone band around eye to indent and close retinal break
Pneumatic retinopexy: gas injection + cryotherapy to fix detachment (office-based)

Gas Tamponade Nursing Care

Face-Down Positioning – Critical

Gas bubble floats. Face-down (prone) positioning for macular hole surgery maintains gas contact with macular area for healing. Required 50 minutes per hour for 1–2 weeks.

Gas types: SF6 (sulphur hexafluoride) lasts 2 weeks; C3F8 (perfluoropropane) lasts 6–8 weeks
Silicone oil: permanent or semi-permanent tamponade; requires surgical removal later; patient can be upright
NO AIR TRAVEL until gas absorbed — dramatic IOP rise at altitude (potentially blinding)
Gas-filled eye: bracelet/card to warn anaesthetists (NO N2O gas during any GA)

Positioning Aids

Face-down support chairs, massage chair inserts, mirror systems for TV/reading. Physiotherapy input for elderly patients. Skin pressure care for prone neck/chest.

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Glaucoma Surgery & Strabismus

Trabeculectomy

Creates new drainage pathway (bleb) under conjunctiva
Mitomycin C (MMC) applied intraoperatively to prevent bleb scarring
Post-op: bleb care critical; avoid rubbing/pressure on bleb
Hypotony risk: IOP too low — soft eye, choroidal effusion
Bleb infection (blebitis): emergency — severe pain, purulent discharge, vision loss. IV antibiotics, vitreous tap
Bleb hygiene: no eye rubbing; avoid water contamination; avoid contact sports
Suture lysis (post-op): laser suture lysis adjusts IOP; nurse to instil topical anaesthetic before procedure

Strabismus Surgery (Squint)

Usually paediatric; corrects misalignment of extraocular muscles
Recession (weakening) or resection (strengthening) of muscles
Post-op: red eye expected (1–2 weeks), sutures visible
Oculocardiac reflex (OCR): bradycardia/cardiac arrest during muscle manipulation — atropine available
Post-op nausea/vomiting common: antiemetic prophylaxis standard
Diplopia immediately post-op: expected; resolves as adaptation occurs
Amblyopia treatment continues post-surgery (patching)

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Glaucoma Eye Drop Classes

Class	Example	Mechanism	Dosing	Key Side Effects / Notes
Prostaglandin analogues	Latanoprost 0.005%, Bimatoprost, Travoprost	Increases uveoscleral outflow	Once daily PM	Eyelash growth (hypertrichosis), iris/periocular hyperpigmentation, hyperaemia. Best IOP lowering (~30%)
Beta-blockers	Timolol 0.25/0.5%, Betaxolol (selective)	Reduces aqueous production	BD (or gel OD)	Bradycardia, bronchospasm. CONTRAINDICATED: asthma, COPD, heart block, bradycardia. Betaxolol = selective β1, safer in COPD
Carbonic anhydrase inhibitors	Dorzolamide 2%, Brinzolamide 1%, Acetazolamide (oral)	Reduces aqueous production	BD–TDS topical; oral for acute use	Topical: stinging, metallic taste. Oral: paraesthesia, hyponatraemia, nephrolithiasis, sulfonamide allergy cross-reactivity
Alpha-2 agonists	Brimonidine 0.2%, Apraclonidine	Reduces production + increases outflow	BD–TDS	CNS depression, apnoea in infants (CONTRAINDICATED <2 years). Allergy: follicular conjunctivitis (up to 25%)
Miotics (cholinergics)	Pilocarpine 1–4%	Increases trabecular outflow (ciliary contraction)	QDS	Miosis (dim vision), headache (ciliary spasm), myopia. Used in acute angle-closure

Combination Drops

Fixed combinations improve compliance: Cosopt (timolol + dorzolamide), Combigan (timolol + brimonidine), Ganfort (bimatoprost + timolol). Fewer drops = fewer preservative-related side effects.

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Anti-VEGF Injections

Agents

Drug	Type	Indications	Regimen
Ranibizumab (Lucentis)	Fab fragment	Wet AMD, DMO, CRVO, ROP	Monthly × 3 then PRN/treat-and-extend
Bevacizumab (Avastin)	Full antibody (off-label)	Same indications; cost-effective	Monthly × 3 then PRN
Aflibercept (Eylea)	Fusion protein (VEGF trap)	Wet AMD, DMO, CRVO, PDR	Monthly × 3 then 2-monthly; or PRN
Faricimab (Vabysmo)	Bispecific (VEGF-A + Ang-2)	Wet AMD, DMO	Monthly × 4 then up to 4-monthly

Intravitreal Injection Nursing Care

Confirm consent, allergy check, correct eye marked
VA and IOP measured before injection
Povidone iodine 5% instilled (mandatory antisepsis)
Topical anaesthetic applied
Sterile drape and lid speculum
Injection site: 3.5–4mm from limbus (pars plana)
Post-injection: check light perception, IOP check

Post-injection Warning Signs

Return immediately if: severe pain, severe redness, floaters (new), significant vision loss — possible endophthalmitis or retinal detachment.

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Steroid Eye Drops

Common Agents

Dexamethasone 0.1%: high potency; post-surgical, uveitis
Prednisolone acetate 1%: moderate-high; uveitis mainstay; shake well
Fluorometholone 0.1%: low penetration; allergic conjunctivitis; lower IOP risk
Loteprednol etabonate 0.5%: "soft steroid"; metabolised quickly; reduced IOP risk

Complications of Prolonged Use

Steroid Response

IOP elevation in ~30% of patients (especially high myopes). Usually reversible on cessation. Prolonged high IOP causes steroid-induced glaucoma.

Posterior subcapsular cataract (PSC) — chronic use (>3 months)
Raised IOP → steroid-induced glaucoma
Delayed wound healing
Increased risk of secondary infection (bacterial, fungal, viral reactivation — HSV)
Monitor IOP at 2–4 weeks if using long-term steroids

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Eye Drop Instillation Technique

Correct Technique (Nurse Teaching)

Wash hands thoroughly
Tilt head back or lie down
Gently pull lower eyelid down to form pocket (inferior fornix)
Look upward; hold bottle 1 cm above eye
Instil one drop into lower conjunctival sac (NOT onto cornea)
Close eyes gently — do NOT squeeze (forces drop out)
Apply nasolacrimal occlusion (NLO): press inner corner of eye with finger tip for 2 minutes
Blot excess — do not rub

Nasolacrimal Occlusion (NLO)

NLO reduces systemic absorption of drops via nasolacrimal duct into nasopharynx. Critical for beta-blockers (reduces bradycardia risk) and brimonidine (reduces CNS effects). Can increase ocular bioavailability by 2–3 fold.

Multiple Drop Timing

Wait minimum 5 minutes between different eye drops. The first drop dilutes the second if given too close together. Give drops that must be shaken (suspensions) last if possible.

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Other Ophthalmic Medications

Mydriatics & Cycloplegics

Tropicamide 0.5–1%: short-acting (4–6h); diagnostic dilation
Cyclopentolate 1%: medium (24h); paediatric refraction
Atropine 1%: long-acting (1–2 weeks); amblyopia treatment, uveitis
Phenylephrine 2.5%: sympathomimetic mydriasis; no cycloplegia; caution hypertension, cardiac disease
Warn patients about photophobia and blurred near vision post-dilation

Antibiotics

Chloramphenicol 0.5%: broad-spectrum; first line conjunctivitis (UK/GCC); aplastic anaemia risk minimal topically
Ciprofloxacin 0.3%: fluoroquinolone; corneal ulcer (intensive); pseudomonal cover
Moxifloxacin 0.5%: broad-spectrum; good penetration; no preservative in some preparations
Fusidic acid 1% gel: Staph coverage; twice daily; eyelid/conjunctival infections
Acyclovir 3% ointment: HSV keratitis; 5x/day for 14 days

Lubricants & Dry Eye

Hypromellose 0.3–0.5%: artificial tears; baseline dry eye
Carbomer 0.2% gel: longer contact time; twice daily
Sodium hyaluronate 0.1–0.4%: viscous; moderate-severe dry eye
Cyclosporin A 0.05% (Restasis/Ikervis): immunomodulation; chronic dry eye; takes 3–6 months effect
Preservative-free formulations: preferred if >4x daily use or contact lens wearers
GCC: high dry eye prevalence — air conditioning, sandstorm exposure

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GCC-Specific Ophthalmology Practice

Diabetic Eye Screening Programmes

Country	Programme	Notes
UAE (Dubai)	Dubai Diabetes Screen + DHA digital retinal photography	Annual for all diabetics; integrated into Salama system
UAE (Abu Dhabi)	DOH-mandated annual screening	NMC/SEHA clinic-based
Saudi Arabia	MOH National Diabetic Retinopathy Programme (NDRP)	Graded photography; teleophthalmology expansion
Qatar	PHCC diabetic eye screening integrated	Hamad Medical Corporation VR unit
Kuwait / Bahrain / Oman	MOH-based programmes	Varying implementation; hospital-based clinics

GCC Screening Recommendation

Type 1 DM: screen 5 years after diagnosis onset
Type 2 DM: screen at diagnosis (may have had undetected DM for years)
Frequency: annually if no retinopathy; 3–6 monthly if NPDR present
Pregnancy: screen pre-conception and each trimester (DR can worsen rapidly)

Vision Requirements for Driving in GCC

Category	Minimum VA	Field
Private vehicle (Group 1)	6/12 (better eye)	120° horizontal (binocular)
Commercial (Group 2) – UAE/KSA	6/9 better eye; 6/60 other	160° horizontal
Both eyes required?	Monocular drivers: assessed individually; must demonstrate safe field

Inherited Eye Diseases – GCC Relevance

Retinitis Pigmentosa (RP): autosomal recessive most common; gene variants prevalent in GCC consanguineous families; RPGR, CNGB1, CRB1 mutations. Symptoms: night blindness, ring scotoma, bone spicule pigmentation. No curative treatment; vitamin A supplementation may slow progression
Leber Hereditary Optic Neuropathy (LHON): mitochondrial inheritance; sudden bilateral visual loss young males; GCC families documented
Bardet-Biedl Syndrome: RP + obesity + polydactyly + renal disease; autosomal recessive; higher prevalence consanguineous populations

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DHA / DOH / SCFHS Exam Key Topics

High-yield DHA Topics

Normal IOP range (10–21 mmHg)
AACG emergency management steps (acetazolamide, pilocarpine, laser PI)
Endophthalmitis signs and treatment
Anti-VEGF injection procedure and nursing care
Gas tamponade positioning (face-down) rationale
Chemical injury: irrigation first, pH monitoring
Eye drop instillation steps and NLO
Cataract post-op drop regimen (steroid/antibiotic/NSAID)

High-yield DOH Topics

Diabetic retinopathy classification (NPDR mild-very severe, PDR)
CRAO management (cherry-red spot, time critical)
Retinal detachment symptoms (floaters/flashes/curtain)
Timolol: contraindications (asthma, heart block)
Latanoprost: once daily PM, side effects (pigmentation)
AMD types and treatment (anti-VEGF for wet AMD)
Penetrating eye injury: Fox shield, NPO, no object removal

High-yield SCFHS Topics

Snellen chart interpretation (6/6, 6/60 meanings)
RAPD: diagnosis significance (optic nerve lesion)
Glaucoma VF patterns (arcuate, nasal step)
Steroid eye drops: IOP risk, PSC risk
Hyphaema grading and management (no aspirin, elevated head)
Trachoma (WHO SAFE strategy)
GCC diabetic retinopathy screening programmes
Retinitis pigmentosa: autosomal recessive inheritance, GCC prevalence

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Practice MCQs (10 Questions)

Click an option to reveal the answer and explanation. These questions reflect DHA/DOH/SCFHS examination style.

1. A patient presents with sudden severe eye pain, coloured halos, fixed mid-dilated pupil, and IOP of 58 mmHg. What is the FIRST pharmacological intervention?

A. Topical pilocarpine 2%
B. IV acetazolamide 500mg
C. IV mannitol 20%
D. Topical atropine 1%

CORRECT: B. This is acute angle-closure glaucoma. IV acetazolamide 500mg rapidly reduces aqueous production. Pilocarpine 2% is also given to constrict the pupil and pull the iris away from the trabecular meshwork. Atropine is strictly contraindicated as it would worsen pupil dilation and angle closure.

2. A patient with wet AMD is receiving intravitreal ranibizumab injections. They call the clinic 48 hours after their last injection reporting severe pain and reduced vision. What is your PRIORITY action?

A. Reassure the patient and schedule their next routine appointment
B. Prescribe topical antibiotic drops via telephone
C. Advise immediate emergency ophthalmology assessment — same day
D. Book urgent appointment within 24–48 hours

CORRECT: C. Post-intravitreal injection endophthalmitis is an ophthalmic emergency. Classic signs: pain, redness, hypopyon, vision loss occurring days 1–7. Treatment requires urgent intravitreal vancomycin + ceftazidime injection. Same-day assessment is mandatory.

3. Which statement about latanoprost (prostaglandin analogue) eye drops is CORRECT?

A. Should be administered once daily in the morning
B. Reduces aqueous humour production
C. Can cause irreversible iris pigmentation and eyelash hypertrichosis
D. Contraindicated in patients with bradycardia

CORRECT: C. Latanoprost 0.005% is administered ONCE DAILY in the evening. It works by increasing uveoscleral outflow. Side effects include eyelash hypertrichosis, iris hyperpigmentation (irreversible), and periocular skin darkening. Bradycardia is a beta-blocker side effect, not prostaglandin.

4. A nurse is preparing to administer multiple eye drops to a glaucoma patient. What is the CORRECT minimum interval between instilling different drops?

A. 1 minute
B. 2 minutes
C. 5 minutes
D. 15 minutes

CORRECT: C. A minimum of 5 minutes should elapse between instillation of different eye drops. This prevents the second drop from washing out the first, ensures adequate absorption time, and minimises drug interactions. Ointments should always be given LAST if used with drops.

5. A patient who had vitreoretinal surgery for macular hole repair 3 days ago calls to say they need to fly to see family. What is your response?

A. Advise they can fly if wearing an eye shield
B. Short-haul flights within 2 hours are acceptable
C. Air travel is absolutely contraindicated until gas is completely absorbed
D. They may fly if supplemental oxygen is used

CORRECT: C. Intraocular gas expands at altitude due to reduced atmospheric pressure — this can cause IOP to rise to catastrophically high levels, potentially causing acute angle-closure glaucoma or central retinal artery occlusion. SF6 lasts ~2 weeks, C3F8 up to 8 weeks. The patient should carry a gas card warning anaesthetists also (no N2O during any surgery).

6. When irrigating a chemical eye injury with alkali, what pH target indicates adequate decontamination?

A. pH 6.0
B. pH 7.0–7.4
C. pH 8.0
D. pH 5.0

CORRECT: B. Target pH 7.0–7.4 (normal physiological tear pH). Measure pH 5 minutes after stopping irrigation. If not neutral, continue irrigating. Check again 30 minutes after stopping. At least 2 litres of normal saline or Ringer's lactate should be used. Alkali injuries require more aggressive and prolonged irrigation than acid injuries.

7. A 45-year-old diabetic patient describes seeing a "curtain coming across" their vision from below. Visual acuity is hand movements. This presentation is MOST consistent with:

A. Central retinal artery occlusion
B. Vitreous haemorrhage
C. Retinal detachment
D. Acute angle-closure glaucoma

CORRECT: C. The "curtain" or "shadow" across the visual field is the classic symptom of retinal detachment as the detached retina blocks incoming light. Combined with diabetes (risk for tractional RD or rhegmatogenous in myopes), profound VA loss to hand movements, this is a same-day ophthalmic emergency. Macula status is critical — macula-on RD must be treated urgently to preserve central vision.

8. Timolol 0.5% eye drops are prescribed for a glaucoma patient. Which condition is an ABSOLUTE contraindication?

A. Hypertension
B. Bronchial asthma
C. Type 2 diabetes mellitus
D. Open-angle glaucoma

CORRECT: B. Timolol is a non-selective beta-blocker (β1 and β2 blockade). Beta-2 receptors are present in bronchial smooth muscle — blockade causes bronchoconstriction. Even topical eye drops can have systemic absorption via the nasolacrimal duct sufficient to precipitate potentially fatal bronchospasm. Other contraindications: second/third-degree heart block, bradycardia, decompensated heart failure.

9. Following penetrating eye injury with a metallic foreign body still in situ, a nurse correctly applies a rigid Fox shield. What is the NEXT most important nursing action?

A. Apply a pressure pad over the shield
B. Make the patient nil by mouth and inform the theatre team
C. Attempt to remove the foreign body to prevent further damage
D. Arrange urgent MRI to localise the foreign body

CORRECT: B. Nil by mouth and urgent theatre notification. Penetrating eye injuries with retained foreign body require urgent surgical exploration under GA. NPO prevents aspiration risk. Plain CT (not MRI) is used to localise metallic FBs. The patient should also receive IV antibiotics (endophthalmitis prophylaxis) and tetanus prophylaxis. Never apply pressure over the globe.

10. Which visual field defect pattern is MOST characteristic of advanced open-angle glaucoma?

A. Bitemporal hemianopia
B. Central scotoma
C. Arcuate scotoma progressing to tunnel vision
D. Homonymous hemianopia

CORRECT: C. Glaucoma damages retinal nerve fibres in arcuate bundles. Visual field loss progresses from paracentral scotomas → arcuate (Bjerrum) scotomas → nasal step → tubular/tunnel vision (central island remaining) → complete blindness. This pattern follows the anatomy of nerve fibre layer. Central vision is preserved until very late, which is why glaucoma can be asymptomatic for years.

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Visual Acuity & Red Eye Triage Tool

Interactive Eye Triage Assessment

Select the patient's presenting features below. The algorithm will generate an urgency level, suspected diagnosis, and recommended action.

Pain Level

Vision Change

Redness

Trauma History

Ophthalmology NursingGCC Advanced Clinical Guide

Interactive Eye Triage Assessment

Ophthalmology Nursing
GCC Advanced Clinical Guide