Doyne's Discoid Cataract (Coppock).

I HAVE been asked many times what I)oyne's Discoid Cataract (Coppock) looks like under the slit-lamp. One of the original family attended at the Oxford Eye Hospital the other day, so I arranged with Mlessrs. Hamblin to have an ophthalmoscopic and slit-lamp painting done. In this particular case the opacity is a fairly dense one, and the patient can only carry on if her pupils are kept slightly dilated with weak atropine. In some of the cases the opacity is very much fainter, and may hardly interfere at all with vision. This case also shows some senile changes which have been developing recently on the inner side of the lens. On examination with the ophthalmoscope the cataract appears as a circular spotted disc in the centre of the lens. On examination with the slit-lamp the disc is seen to be a small spotted biconvex opacity, the spots looking bright white in the beam of the lamp, with a more or less clear central area. The Y's could not be definitely identified but the opacity appeared to involve the embryonic nucleus only, and to be of the nature of a very small "lamellar " cataract. In the case illustrated here, there is a large vacuole at about XI o'clock on the edge of the opacity. This is a senile change which has developed fairly recently.