Failure of pupillary dilation in early choroidal detachment.

Transient miosis presents a challenge in extracapsular cataract extraction and retinal detachment surgery, despite the advent of the small-pupil ophthalmoscope. Mechanisms have been proposed and preventive measures described. We describe a case of transient miosis that led to cancellation of the repair of retinal detachment and was the first sign of early choroidal detachment.