BIOL 212 Lecture Notes - Lecture 14: Visual Acuity, Retina, Refraction

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14 - the special senses (eyes and ears) iii. Process begins as light rays enter eye. Transmitted through the cornea, aqueous humor, pupil, lens, and vitreous humor to the retina. Sensitive nerve cells of the retina transmit the image through the optic nerve to the brain. Process of bending of light rays as they pass through the various structures of the eye to produce a clear image on the retina. Occur when the eyeball is abnormally shaped. Occur when the lens has lost the ability to accommodate to near vision. Refractive error causing light rays entering the eye to be focused irregularly on the retina due to an abnormally shaped cornea. Contact lenses or eyeglasses to neutralize defect. Inflammation of the eyelid margins stemming from seborrheic, allergic, or bacterial origin. Occurs when the eyelid partially or entirely covers the eye as a result of a weakened muscle. Loss of the sense of sight or extreme visual limitations.

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