Keratoconus Eye Disorder
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Keratoconus Eye Disorder Excerpt
Keratoconus is a degenerative eye disorder involving structural changes within the cornea that can cause visual distortions, such as multiple images, streaking and light sensitivity.
I believe that keratoconus would have been rare or non-existent among our pre-agricultural ancestors simply because if it were entirely a genetic maladaptation, it would have been rapidly eliminated by natural selection.
Given the incidence of keratoconus in Western populations, it seems likely that environmental factors introduced since the advent of agriculture may trigger this disease. Clearly diet and sunlight exposure (vitamin D) have to be implicated.