Methods: A 22-year-old woman was diagnosed as rhegmatogenous retinal detachment. She was treated with buckle and cryotherapy, and additional laser photocoagulation was needed after the surgery to surround the retinal tears in the upper temporal and lower temporal quadrants. One month later, she noticed that she had anisocoria.

Results: Ophthalmic examination showed that the right pupil was a bit larger than the left pupil in room light. Topical administration of 0.1% pilocarpine demonstrated marked supersensitivity of the right pupil and little effect on the left pupil. Cerebral and orbital magnetic resonance imaging was normal. Three months later, she also exhibited light-near dissociation.

Conclusions: The probable basis for this phenomenon is the lesion, which exists at the ciliary ganglion or at the parasympathetic postganglionic fibres. Review of the pathophysiology is presented. Keywords : Adie's pupil, Tonic pupil, Retinal detachment