Crystalline keratopathy from Dieffenbachia plant sap.

correctly diagnosed by CT scan have been described.6 Ultrasonography has been advocated in view of its availability, low cost, and high detection rates. One study,3 using porcine eyes, reported an overall IOFB detection rate by ultrasound of 930/O compared with 40°/O by plain x ray. Significantly, Bryden et al's detection rate for Perspex was 96%. Localisation is, of course, less accurate and the technique may not be applicable in some acutely injured eyes. This case emphbsises the need for a combined approach using plain x ray, CT, and ultrasound in the complete assessment of a penetrating eye injury where an intraocular foreign body is suspected.