Sheep Eye Dissection Lab Analysis

For this lab, we were able to dissect a preserved sheep's eye in order to learn more about the structures of the human eye. Throughout the lab, we were tasked with finding certain aspects of the eye while dissecting, and in the following picture, I was able to define the parts mentioned.

As for the order that light travels through the eye, light passes through the cornea and the aqueous humor, where it then enters through the pupil. The cornea mainly serves to protect the eye, while the pupil is the hole in the center of the iris that lets light into the eye. The iris, or the colored part of the eye, expands and contracts, controlling the size of the pupil accordingly in relation to the amount of light in the room. After passing through the pupil, light goes through the lens, and then goes through the vitreous humor to to hit the retina, where the image is then sent through the optic nerve to be processed in the brain. Sheep and other animals have a layer of tapetum lucidum to help them see better in the dark, and like us, have a choroid layer to absorb reflecting light in the eye. The sclera is the chute of the eye, and is tough in order to further protect the eye; attached to said layer are accessory muscles that contract and stretch to control eye movement.