>> i am noreen wheaton. while humans share binocular vision, like most bards, vision acuitier to ability to distinguish details of some bird spee 2 1/2 to 6 times better than hue mans and to know how our vision compares with that of birds is difficult and we must use anatomy and behavior to compare bird's ability to see with our own. also, each species vision has evolved differently depending on the environmental conditions in which it survives. so how are other eyes different? for one, most species of birds have huge eyeballs. some raptor's eyes are 15 times the size of ours. we can only see a small portion of the bird's eyes on the surface. if our ice were proportionately the size of owls, they would be as big as baseballs and weigh 2 to 3 pounds. in both hue mans and bird, the innermost layer of the eyeball is the retina which consists of light sensitive cells, the rods and cones. eyes consist of large pupils and highly curved cornea that provide a bright image to the retina. unlike human eyes, the retina