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13 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What are the 3 layers that make up the eye? |
Outer layer: Fibrous Tunic Middle layer: Vascular Tunic Inner layer: Nervous Tunic |
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Fibrous Tunic |
The outler layer of the eye that consists of the sclera and the cornea |
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Vascular Tunic |
Consists of the iris, choroid, and the ciliary body |
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From anterior to posterior order what are the 5 layers of the cornea |
Epithelium Bowman's Membrane Stroma Descemet's Membrane Endothelium |
Posterior is innermost Anterior is outermost |
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Iris |
The colored part of the eye. It has 2 muscles that open and close in order to regulate the amount of light that enters the eye. |
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Nervous Tunic |
The inner layer of the eye. It consists of the retina |
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What is Accommadation and how is it acheived? |
Accommadation is the process of focusing on an object based on distance. The Crystalline lense first focuses the light on the retina, then the cillary bodies attach to the lens via zonules. When the cillary bodies contract they thicken the lense which adds power to see objects up close and when they relax the lense becomes thinner, which allows the eye to focus on distance |
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Rods |
photoreceptor cells that suited for night vison and peripheral vision. There are aprox. 120 million rods, most of which are located on the periphery. |
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Cones |
Photoreceptor cells that detect detail and color. There are aprox. 6 million cones in the retina |
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Emmetropia |
Free of refractive error Light comes to focus on the retina. Not before Not after. |
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Myopia |
A refractive error where light comes into focus in front of the retina. This makes objects that are far away look blurry. Uses a - prescription |
near-sightedness |
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Hyperopia |
A refractive error where light comes into focus behind the retina. This causes items that are up close to be blurry but items far away are clear. Uses a + prescription |
far-sightedness |
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What is the Cornea's index of refraction |
1.376 |
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