Protruding Iris Collarette
A 37-year-old woman presented to an ophthalmologist with itching and watering of her eyes. Examination revealed conjunctival papillary reaction and mild hyperemia, findings that were consistent with allergic conjunctivitis. Her visual acuity was 20/20 in both eyes. The intraocular pressure was normal, and the pupils in both eyes were round and equally reactive to light and accommodation (adjustment for distance). On slit-lamp examination, prominent iris collarettes were noted in both eyes (the left eye is shown). The iris collarette is a landmark that separates the central pupillary zone from the peripheral ciliary zone. It is typically flat but can be prominent, as seen in this patient. This finding is a normal variant. It is benign and asymptomatic and requires no treatment. The patient received treatment for allergic conjunctivitis and reassurance about this incidental finding.
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