Last Friday, Dr. Pamela Fong, an optometrist, came to my Biology class and talked about how to be an optometrist. She said she took in high school Biology, Chemistry, and Physics. Also, she told us she took these three courses again plus microbiology and anatomy in college.
She told us about the eye in general and told us about the parts of the eye. She started with the cornea, which is the main focusing lens of the eye. Next, she told us about the iris, which is the colored part of the eye that has fibers on it that have many colors, but from afar, it looks like someone has only one color because the color that you could see from afar is just light reflecting off. Then she told us about the pupil, which lets light in and could dilate or tighten depending on the level of light. Everyone's retina is unique, which makes the eye a complex instrument in the human body. There are people who have eye defections, like myopia, a condition in the eye that makes a person only see near them, thus given the nickname "near-sighted." Another condition is hyperopia, which is the exact opposite of myopia, people with hyperopia can only see far away, thus given the nickname "far-sighted." A person who is myopic and a person who is hyperopic would have different grades of glasses because a person who is myopic has a cornea that is too strong, so an optometrist must fix a myopic person with a negative grade. For example, I am myopic, and my grade is -0.75. A person who is hyperopic would have a positive grade on their glasses. Another one is astigmatism, which is cornea aspheric.
I learned that when you cut the sheep eyes, you could see the caratoid layer, which looks black due to the preservatives put inside. I also learned the vitreous found in the eye is really hard because it is an artificial one due to the sheep having cataract.
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