http://en.wikipedia.org/wiki/Eye
The resolution of pit eyes can be greatly improved by incorporating a material with a higher refractive index to form a lens, which may greatly reduce the blur radius encountered—hence increasing the resolution obtainable.The most basic form, seen in some gastropods and annelids, consists of a lens of one refractive index.
The resolution of pit eyes can be greatly improved by incorporating a material with a higher refractive index to form a lens, which may greatly reduce the blur radius encountered—hence increasing the resolution obtainable.The most basic form, seen in some gastropods and annelids, consists of a lens of one refractive index.
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