Observations on the Choroidal Circulation

THE discovery of aqueous veins and subsequent studies of their significance in health and disease have been responsible in no small measure for a new impetus to research work in the aetiology of glaucoma, which in turn has necessitated a re-examination of our fundamental knowledge of the anatomy and physiology of the ocular circulation and the drainage of the aqueous humour, with particular reference to the ocular tension. Amid the abundant recent literature on these subjects are a few papers directing attention towards the minute anatomy of the choroidal circulation, and the findings reported would be of very great importance if the evidence could be regarded as conclusive. It is the purpose of this paper to discuss these reports in the light of our own experience, and to introduce a technique which is likely to prove of value in future work in this field.