Tuesday, March 7, 2017

Eye Dissection

When light enters the sheep's eye it passes through the cornea, then through the pupil, that the ciliary bodies adjust the amount of light allowed by adjusting the iris around the pupil. Then it enters the aqueous humor that flowed out when we opened up the eye and directly into the lens, which was yellow, hard, and clouded due to cataracts, then it enters the vitreous humor, which not only holds the shape of the eye it has the light travel through it. Then the light hits the retina which turns the light into electrical impulses that travel through the optic nerve and out to the brain to be turned into a picture.
The eye before being dissected. The cornea is the dark circle. Surrounding it is fat that covers the sclera, the white of the eye. 

This is the lens detached from the vitreous humor and the ciliary bodies. The black lines are the ciliary bodies that have not been removed. The lens feels hard like a ball of dried wax.  

The retina peels off of the back half of the eye to reveal the tapedum lucidium. This is used to reflect light and allow the animal to see better at night. This is why cat's eyes glow in the dark when light is shone on them.

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