A Comparison Between a Human's and Cow's Eye

Aim

To compare the structure of the cow's eye to the structure of a human eye

Materials

Cow's eye

Sharp Knife

Plastic dishes

Paper Towel

Tweezers

Mounted Needle

Hypothesis

My hypothesis is that we should be able to see all the parts of a human eye (that we've been studying from the text book) in the cow's eye. This is my hypothesis because just from my knowledge, I think cow's need to see as well as humans do. They need to see what they are eating, where they are going, and since all mammals are somewhat related, their eye functions should be relatively similar to each other. I don't think evolution changed the functions of eyeball in mammals that differently to each other. We all live in similar environment and we all use eyes for the same purpose.

The Exterior of the Eye

A table comparing the exterior of the eyeball in cows and humans

Optic Nerve

It looks exactly like in the text book, except that I think that the white 'wall' or 'membrane' surrounding the nerve fibers in the pig was thicker; I could hardly see the nerve fibers.

Eye on Science

Eye Diagram without text

Human eye. Español: Iris de un ojo humano. El ojo...

Pupil

The shape of the pupil in cow's are oval. Humans are round. When strong light passed the pupil of the cow's eye, it appeared to be blue colour! Humans are only black.

Sclera

They appear to be the same. (The cow's sclera is so thick to break through!)

Iris

When I looked around at my colleague's eyeball cow, all the iris seemed to be dark brown. I know that human's iris come in different colour such as green, blue, gray, etc.

Cornea

They look exactly the same

Exterior Observations - A diagram illustrating the shape of Cornea, Iris and Pupil

Description of Cow's Eyeball's Shape

The two eyeballs...