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Relevance. Rating Newest Oldest. Best Answer: The cow's eye is bigger, its iris is only one color, it has a tapetum, its corneas are tougher. the iris is brown on a cow and on humans its many different colors, and the tapetum is what allows animals to see well in the dark which is something a human doesnt have.Source(s): butcher.Todd S Â· 7 years ago.est Answer: The cow's eye is bigger, its iris is only one color, it has a tapetum, its corneas are tougher. the iris is brown on a cow and on humans its many different colors, and the tapetum is what allows animals to see well in the dark which is something a human doesnt have. Source(s): butcher. Todd S Â· 7 years ago.
Brown eyes are the result of higher melanin concentrations which absorbs more of the light, reducing the amount of light being reflected. In humans, brown eyes result from a relatively high concentration of melanin in the stroma of the iris, which causes light of both shorter and longer wavelengths to be absorbed..