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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.
View full size image. Chickens may have bird brains, but their eyes are a different matter. When it comes to color vision, these farm fowl have bested humans in many ways, a new study finds. The superior color vision comes down to a well-organized eye, structurally speaking, the researchers say. They mapped five types of light receptors in the eyes of chickens.