Modern ocular photographic documentation now seems to be described on the basis of three attributes which together produce a "complete" picture of the disease process under study. The first photographic characteristic is stereoscopy; the second, color, and the last, serialization. Reflection will make clear that these represent the photographic properties necessary to accurately capture and record elevation-depression from a normal physiological plane, change in color, and extent of lesion, three ways in which pathology not infrequently manifests itself. As Newhall1 has recently pointed out, the camera documents only what is before the lens, the unobvious as well as the obvious, and for this reason the resulting photograph often contains information which was unnoticed at the instant of exposure. In ophthalmic photography this last fact has been experienced by many and not infrequently adds additional helpful information used in diagnosing and treating the particular disease. This paper is primarily concerned
NORTON HJ, SULLIVAN CT. Practical Dual-Exposure Stereophotography of the Retina. AMA Arch Ophthalmol. 1958;60(3):455–460. doi:10.1001/archopht.1958.00940080473017
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