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chapt 17 eyeearnose
disease process eye ear nose chap 17
Question | Answer |
---|---|
Macula | yellow disk on retina behind lens |
what nourishes the eye? | blood vessels |
what is conjunctiva? | inner mucous membrane surface of the eyelids |
What is Refraction | The bending of light rays. produced by the cornea and the lens. |
Hyperopia | light comes to a focus behind retina. vision is better for distant objects. Commonly called farsightedness.Difficulty seeing objects up close.caused from globe of eye being abnormally short in length. |
Presbyopia | A form of farsightedness causes eye to lose focus. From loss of elasticity in crystalline lens. Caused from advancing age. |
Myopia | Light comes to focus in front of retina. vision better for nearby objects. commonly called nearsightedness.Happens when eyeball is abnormally long from front to back. |
Astigmatism | Refractive error when light entering eye is focused unevenly. Caused by variations in the curvature over lens or cornea. Creates out of focus vision. |