Explaining why a normal-looking eye needs slit-lamp screening — OSCE

Candidate instructions (8-minute station)

You are the paediatric registrar in the outpatient clinic. A four-year-old girl has just been diagnosed with oligoarticular ANA-positive juvenile idiopathic arthritis. The paediatric rheumatologist has arranged a baseline slit-lamp examination and explained that she will need eye screening every three months. The mother is anxious — her daughter's eyes look perfectly normal, she has never complained about her vision, and the mother does not understand why she needs to see an eye doctor so often. ^[7]

The candidate must: ^{[7] [9]}

1. Explain the silent nature of JIA-associated uveitis — that the inflammation inside the eye produces no redness, pain or visible change in the early stages, so the eye looks normal even when inflammation is present. ^[7]

2. Explain what the slit-lamp looks for — the ophthalmologist uses a special microscope to look for inflammatory cells and protein haze (flare) inside the anterior chamber, which are invisible to the naked eye but are the signs of active uveitis. ^[1]

3. Explain why three-monthly screening matters — because untreated uveitis can cause permanent damage to the eye (band keratopathy, cataract, glaucoma, adhesions) and to the developing brain's vision centre (amblyopia), and because catching the inflammation early with treatment prevents this damage entirely. The three-monthly schedule is based on the child's risk profile (ANA positive, oligoarticular JIA, young onset). ^[7]

4. Outline the treatment plan if uveitis is found — eye drops to reduce the inflammation (prednisolone) and drops to widen the pupil and prevent adhesions (cycloplegic), with specialist medications like methotrexate or a biologic injection if the drops alone are not enough. The treatment is shared between the eye doctor and the rheumatology team. ^[9]

5. Give a clear safety-net — bring her back sooner if the pupil looks small or irregular, if a white patch appears on the coloured part of the eye, if her vision seems to change, if she squints or holds things close to see, or if the eye becomes red, painful or light-sensitive. ^{[9] [7]}