The number of species should increase with increasing island size. This is also known as the species-area hypothesis.

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Cones 

Higher visual acuity

responsible for vision in bright light (photopic vision) Participate in color vision

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Inputs from eye to CNS: 

Input from the rods 

Input from the cones

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Duplicity Theory 

The existence of these two kinds of input, each working maximally under different conditions of illumination

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Axons of retinal ganglion cells  Received and transduced information and carried to the CNS

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Blind spot  There are no visual receptors over the optic disk

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The photosensitive pigment in the rods is called rhodopsin (visual purple).