Article Synopsis
- The mystery of retinal straylight, first theorized by Stiles in 1929, suggested a strong dependency on wavelength (lambda(-4)), but this has not been observed in practice.
- Using a precise method called 'compensation comparison', researchers measured retinal straylight across a range of wavelengths (625 to 457 nm) while considering different eye pigmentation.
- The findings revealed that retinal straylight varies significantly with eye pigmentation and age, with well-pigmented young individuals showing a clear lambda(-4) dependence, while those with less pigmentation exhibit additional components that disrupt this relationship.
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Article Abstract
Wavelength dependence of retinal straylight has been a mystery since Stiles in 1929 [Stiles,W.S., 1929. The scattering theory of the effect of glare on the brightness difference threshold. Proc. R. Soc. Lond. (Biol.) 105, 131-41.] supposed it to have the strong Rayleigh type lambda(-4) dependence, typical for small particle light scattering, but which was never found. Using the accurate 'compensation comparison' approach, retinal straylight was measured from 625 to 457 nm. Subjects with a large variety of ocular pigmentation were included. Straylight was found to depend strongly on pigmentation of the eye, in addition to age. Young and well-pigmented eyes (young negroids) show nearly perfect lambda(-4) dependence. With less pigmentation (blue-eyed Caucasians), a red dominated component is added, negating the lambda(-4) dependence.
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