Evaluation of photographic methods for documentation of lens opacities

Abstract

Several systems have been developed to document lens opacities photographically. In general, the settings for these photographs have been standardized, but there has been no scientific basis for the selection of these settings. We investigated several of these variables. We examined the effect of degree of angulation of the slit beam in slit photography of the nucleus and found no difference in the grading of nuclear opacities in paired photographs taken with illumination angles of 30 or 40°C. Similarly, we found no difference between black-and-white and color film in the detection or grading of either cortical or posterior subcapsular opacities in retroillumination photographs and no differ..