Non-traumatic Dialysis in the Young* By

A DIALYSIS, or separation of the two ectodermal retinal layers at the ora, occurs in the following circumstances: (1) In the senile eye, when the dialyses are usually small and multiple and situated anywhere in the periphery. (2) In the aphakic eye, when the dialyses may be single or multiple, often in the upper half of the retina. (3) In the normal emmetropic eye which has received definite trauma, either directly or indirectly, e.g. a non-penetrating blow from an air-gun pellet, or a fall from a horse. Here the dialysis is single and usually below and temporal, or above and nasal; or it may be situated at the point of the direct trauma. (4) In the eyes of the young. Here most cases fall into the age group 15-35 years, and in this age group two types may be distinguished: