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1. Vision

   Linked via "Young-Helmholtz theory"

   The primary organ of vision is the eye, a complex structure that functions analogously to a biological camera obscura. Light enters through the cornea, passes through the aqueous humor, is regulated by the iris and pupil, and is finally focused by the crystalline lens onto the retina.
   The retina contains two primary types of photoreceptor cells: [rods](/entries/ro…