Proceedings PaperMeasurements And Speculations On The Subclinical Astigmatism
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By the use of a slit pupil of variable orientation, placed in the focal plane of a Badal lens (sometimes coupled to a laser refractor), faint meridional differences in optical power are found in eyes clinically regarded as emmetropic. This subdlinical astigmatism is known to depend on a number of stimulus related factors. Amongst others, fresh material is now displayed indicating its dependence on the spectral composition of illumination, in particular, when passing from red to blue on CTV monitors, by using as test object the grain (or texture) of the screen. It cannot be excluded that these effects have a behavior related teleological meaning.