During class on Thursday we had a guest lecturer come talk about the eye, and who better to talk about the eye then an optometrist. Her name was Dr. Pamela Fong. She had a lot to talk about considering the eye is a very complex organ. First she showed us a model of an eye and all the main parts of the eye, such as the: iris, lens, optic nerve, retina, pupil, and cornea. The iris is the colored part of someone’s eye and also identifies the person, because everyone’s iris is slightly different. The cornea is the very front of the eye, if the cornea is too strong you’re near-sighted or myopic and if it’s too weak you’re far-sighted and hyperopic. If someone has astigmatism their cornea is aspheric or warped. The lens flattens and rounds to focus what you see. The optic nerve connects your eyes to the brain; this is also where your blind spot is located. The retina lines the inside of the eye and contains rods and cones. These rods and cones are light-sensitive and help you see in dim light or the dark. In the retina is a black spot, called the macula that contains cones, it helps your depth perception.
After this, she showed us pictures she had taken of the back of people’s eyes. It turns out you can learn a lot about the person just by looking at those pictures. The macula was located on opposite sides for the right and left eye. This would show which one you were looking at. If there is a sheen around the macula it means you are looking at a young eye. In the eye there are arteries and veins, by the width or size of the veins you can tell if someone was sick or had a problem with their body. People with light eyes usually have light-colored hair and vice versa, and depending on what the shade of the eye is you can tell what their hair color is. So by looking at the back of an eye you can tell all that, that’s pretty impressive.
One thing that Dr. Fong said that interested me was the fact that everyone sees things differently because our brains think differently.
Sheep Eye Dissection
Few minutes later we had a sheep eye dissection. I thought it’d be interesting to dissect an eye, but I also thought it’d be gross. When we cut open the eye all this clear goo spilled out, that was the vitreous humor, it helped the eye keep its shape. The lens was a hard clear object shaped like an actual lens. The sclera, covering of the eye, was grayish, attached to the end of the eye was the optic nerve. The inside of the eye was a metallic blue and the retina lining it was yellowish white. I learned a lot about the anatomy of the eye from this dissection.
After this, she showed us pictures she had taken of the back of people’s eyes. It turns out you can learn a lot about the person just by looking at those pictures. The macula was located on opposite sides for the right and left eye. This would show which one you were looking at. If there is a sheen around the macula it means you are looking at a young eye. In the eye there are arteries and veins, by the width or size of the veins you can tell if someone was sick or had a problem with their body. People with light eyes usually have light-colored hair and vice versa, and depending on what the shade of the eye is you can tell what their hair color is. So by looking at the back of an eye you can tell all that, that’s pretty impressive.
One thing that Dr. Fong said that interested me was the fact that everyone sees things differently because our brains think differently.
Sheep Eye Dissection
Few minutes later we had a sheep eye dissection. I thought it’d be interesting to dissect an eye, but I also thought it’d be gross. When we cut open the eye all this clear goo spilled out, that was the vitreous humor, it helped the eye keep its shape. The lens was a hard clear object shaped like an actual lens. The sclera, covering of the eye, was grayish, attached to the end of the eye was the optic nerve. The inside of the eye was a metallic blue and the retina lining it was yellowish white. I learned a lot about the anatomy of the eye from this dissection.
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