In 1954 Donaldson1 described the latest modification of his camera for medical stereophotography. With his unit, excellent stereophotographs of the external eye, anterior segment, and angle of the anterior chamber could be obtained. Fundamentally, the Donaldson camera is two reflex cameras mounted side by side and connected to a common reflex housing, with use of rhomboid prisms in front to provide a satisfactory interlens distance. There is a mechanism which permits independent adjustment of the interlens distance and parallax displacement. It is well conceived and has produced beautiful pictures. However, the camera is difficult to obtain and is very expensive. For these reasons, it does not fully answer the needs of the average office or eye clinic which desires to improve its photographic records by adding stereoscopy.
In 1955 Goodstein and his co-workers2 described a method of taking pictures through a gonioscopic lens, with use of a hand