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To the Editor:
It is our hope that our papers on spectral reflectance will not be misconstrued as downgrading the excellent laboratory investigations concerning visual pigments performed by Weale, Rushton, and other groups. Our approach is essentially directed toward the clinical patient where none of the refinements available for laboratory experimentation can be employed. On the other hand, our method is simple, quick, and practical. Therein lies its usefulness to clinical situations.There is question that blue light penetrates beyond the neurofiber layer, witness the fluorescence in blue light of dyes in deeply located vessels (including those of the choroid). The crucial factor is that the amount of light which reaches the photographic emulsion after crossing this layer twice is insufficient to form an image superimposed on the light reflected from the surface. A demonstration of this occurs in diabetes mellitus. Here, a punctate retinal hemorrhage may be well demarcated
Behrendt T, Duane TD. FUNDUS PHOTOGRAPHY. Arch Ophthalmol. 1966;76(3):468. doi:10.1001/archopht.1966.03850010469041