Why is the human eye having some white part whereas cows eyes not?
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This is caused by the tapetum lucidum in cows, which is an area of chartreuse pigment located just below the retina at the level of the choroid, in the back of the cow's eyeball. The light that enters the eye reflects within the eye and amplifies low levels of light, which improves their vision at night.
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The eyeballs of humans and the eyeballs of cows have a similar structure overall. Both have the sclera, which is the white part of the eyeball, cornea or the clear structure over the iris and pupil, lens, vitreous fluid, retina and choroid.
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