Why Eye History Is a High-Yield OSCE Station
Ophthalmology presentations appear in GP, A&E, and general medical OSCE circuits. Eye history stations often involve acute presentations requiring urgent management — sudden painless vision loss, acute painful red eye, or monocular visual disturbance. The examiner is specifically looking for your ability to identify emergencies and respond appropriately. You do not need to be an ophthalmologist — you need a systematic approach and the ability to recognise what cannot wait.
The Core Framework: Systematic Eye History
Work through these domains in order for every visual complaint:
1. Presenting Complaint and SOCRATES
| Question | Key follow-up |
|---|---|
| Site | Which eye — right, left, or both? Which part of the visual field? |
| Onset | Sudden (seconds/minutes) or gradual (days/weeks/months)? |
| Character | Blurred, cloudy, distorted, missing field? Curtain or shadow? |
| Associations | Redness, pain, discharge, headache, nausea |
| Time course | Constant or intermittent? Progressive? |
| Exacerbating | Worse in bright light? Worse at night? |
2. Always Ask About These Specific Features
- Visual acuity: "How much can you see — can you read, recognise faces, see hand movements?"
- Type of pain: sharp/gritty (corneal) vs deep aching (raised intraocular pressure, uveitis) vs no pain (vascular — most serious)
- Redness: localised (episcleritis, AC joint) vs diffuse (conjunctivitis) vs limbal flush (glaucoma, uveitis)
- Discharge: purulent (bacterial) vs watery (viral) vs mucoid (allergic)
- Floaters: new sudden-onset floaters = posterior vitreous detachment or retinal tear until proven otherwise
- Flashes: photopsia (flashing lights) = traction on the retina — retinal tear risk
- Visual field defect: "Have you noticed any missing area of vision — like a curtain or shadow?"
- Haloes around lights: acute angle closure glaucoma
- Diplopia: monocular (disappears with one eye closed = within the eye) vs binocular (persists with one eye covered = cranial nerve or orbital pathology)
Differentiating by Symptom Pattern
Sudden Painless Vision Loss
🧠 Mnemonic
RSVP — causes of sudden painless vision loss
R — Retinal detachment: floaters then flashes then a curtain from the periphery inward
S — Stroke: cortical (bilateral homonymous field defect) or optic nerve (amaurosis fugax)
V — Vascular: CRAO (complete sudden loss), CRVO (haemorrhagic, less acute), AION (ischaemic optic neuropathy)
P — Posterior vitreous detachment: new floaters and flashes — usually benign, but must exclude retinal tear
⚠️ Red Flag
Central retinal artery occlusion (CRAO) is the ocular equivalent of a stroke — sudden complete painless monocular vision loss, cherry-red spot on fundoscopy. This is a time-critical emergency. Immediate senior and ophthalmology review is required.
Gradual Painless Vision Loss
| Cause | Key discriminating features |
|---|---|
| Cataracts | Gradual glare, difficulty in bright light, improved visual acuity with pinhole test |
| Chronic open-angle glaucoma | Insidious peripheral field loss, raised IOP, cup-to-disc ratio over 0.6, family history |
| Age-related macular degeneration | Central field loss, metamorphopsia (straight lines appear wavy), age over 60 |
| Diabetic retinopathy | Known diabetes, bilateral, may have floaters from vitreous haemorrhage |
| Optic neuritis | Young adult, unilateral, painful on eye movement, central scotoma, relative afferent pupillary defect |
The Painful Red Eye — Differentials
| Condition | Pain | Redness pattern | Pupil | Vision | Key clue |
|---|---|---|---|---|---|
| Acute angle closure glaucoma | Severe aching + headache + nausea | Limbal flush | Semi-dilated, fixed | Reduced | Haloes around lights, rock-hard eye |
| Anterior uveitis (iritis) | Dull ache, photophobia | Limbal flush | Small, constricted (miosis) | Mildly reduced | Ankylosing spondylitis, IBD, sarcoidosis |
| Corneal ulcer/keratitis | Sharp, foreign body sensation, photophobia | Diffuse | Normal | Reduced | Contact lens wearer, white corneal opacity |
| Conjunctivitis | Gritty (not true pain) | Diffuse | Normal | Normal | Discharge present |
| Scleritis | Severe, boring, nocturnal | Deep red, scleral | Normal | May be reduced | Rheumatoid arthritis |
| Episcleritis | Mild, localised | Sectoral, superficial | Normal | Normal | Blanches with topical phenylephrine |
| Subconjunctival haemorrhage | None | Bright red, flat, well-defined | Normal | Normal | Trauma, Valsalva, anticoagulants |
Past Medical and Drug History — Eye-Specific
- Diabetes (diabetic retinopathy, macular oedema)
- Hypertension (hypertensive retinopathy, CRVO, CRAO)
- Autoimmune conditions: ankylosing spondylitis, IBD, sarcoidosis (uveitis), rheumatoid arthritis (scleritis, sicca)
- Previous eye surgery, trauma, contact lens use
- Refractive error: myopia (increased retinal detachment and PVD risk)
High-yield drug history for eye complaints:
- Hydroxychloroquine (lupus, RA): bull's-eye maculopathy — requires annual monitoring
- Ethambutol (TB): optic neuropathy with colour vision loss — test Ishihara plates before and during
- Systemic corticosteroids: posterior subcapsular cataracts and raised intraocular pressure
- Amiodarone: corneal microdeposits, optic neuropathy
- Sildenafil and PDE5 inhibitors: transient visual disturbance, non-arteritic AION
ICE and Safety Netting
ICE: "Some patients worry that their visual symptoms might mean something serious — is there anything specific you're concerned about?"
Safety net: "If you notice your vision gets suddenly worse, you see a curtain coming across your vision, you develop a very severe headache with the eye pain, or you notice a sudden shower of new floaters, please go to A&E immediately and do not wait for a GP appointment."
💎 Clinical Pearl
Always test each eye separately. Patients with gradual bilateral visual loss frequently present describing only one eye — they have adapted to the other eye's reduced vision without realising. Cover one eye and test visual acuity in each independently.
Frequently Asked Questions
"How do I differentiate a painful red eye from a painless red eye in an OSCE?"
Painful red eye causes: acute angle closure glaucoma (severe aching, semi-dilated fixed pupil, haloes, raised IOP), anterior uveitis or iritis (dull ache, photophobia, small constricted pupil, limbal flush — associated with ankylosing spondylitis), corneal ulcer (sharp foreign body pain, photophobia, often in contact lens wearers), and scleritis (boring nocturnal pain, associated with rheumatoid arthritis). Painless red eye includes conjunctivitis (discharge), episcleritis (sectoral, blanches), and subconjunctival haemorrhage.
"What is amaurosis fugax and what does it indicate?"
Amaurosis fugax is transient monocular visual loss lasting seconds to minutes, often described as a curtain or shutter coming across the vision and then clearing. It is caused by transient retinal ischaemia, most commonly from emboli arising from carotid artery atherosclerosis or a cardiac source. It is the ocular equivalent of a TIA and requires urgent investigation — carotid Doppler, echocardiogram, ECG, and antiplatelet therapy. The risk of ipsilateral stroke is high in the days following the episode.
"What are floaters and when should I be concerned about them in an OSCE?"
Most floaters are benign vitreous opacities from posterior vitreous detachment, common in myopes and those over 50. They become concerning when accompanied by flashes of light (traction on the retina suggesting a tear), a sudden shower of new floaters (vitreous haemorrhage), or a curtain or shadow in the visual field (retinal detachment). Any of these combinations requires same-day ophthalmology review — retinal detachment is a surgical emergency.
"Which drug histories are most important in an eye history OSCE?"
The highest-yield drug history questions relate to hydroxychloroquine (used in lupus and rheumatoid arthritis — causes irreversible bull's-eye maculopathy requiring annual retinal monitoring), ethambutol (TB treatment — causes optic neuropathy with progressive colour vision loss), systemic corticosteroids (posterior subcapsular cataracts and elevated intraocular pressure), and amiodarone (corneal microdeposits visible on slit lamp, and optic neuropathy).
"How do I describe a visual field defect in a history?"
Ask the patient to describe it in their own words first, then clarify: Is it one eye or both? Is it central (cannot see what I am looking at — macular disease, optic neuritis) or peripheral (cannot see to the side — glaucoma, homonymous hemianopia from stroke)? Is it a curtain from the periphery inward (retinal detachment — the curtain starts from the side where the detachment begins)? Is it the upper or lower half? This information localises the lesion anatomically.
Related guides: [Neurological History OSCE](/blog/neurological-history-osce) · [Cranial Nerve Examination OSCE](/blog/cranial-nerve-examination-osce) · [Diabetes History OSCE](/blog/diabetes-history-osce)