A New Analysis Method for Cataractous Images Taken by Retroillumination Photography

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Abstract
Photographic data have been used to diagnose cataracts. In particular, retroillumination photographs are popular and useful owing to their clearness of whole images of crystalline lenses at a glance. A new procedure called grid method for the quantitative analysis of retroillumination photographs is proposed here. With this method a ratio of cataractous area to total area can be calculated by separating an image of a lens in grids, with a greater precision compared with the usual threshold method. Furthermore, based on a correlation check of the grid number and the resulting accuracy we determined that 25 grids is the optimal cutting for our grid method.

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