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How does The Normal Eye work?
How does The Normal Eye work?
The eye works like a camera.
How does The Normal Eye work?
The eye works like a camera. Light enters the eye through the cornea (the clear front window of the eye). The pupil controls the amount of light. In people having perfect vision, the light focuses directly on the retina and the image is sent to the brain whereas in people with vision problems, light does not focus directly on the retina, thus producing visual distortions.
Parts of the Eye
•Cornea: Transparent front part of the eye that covers the iris, pupil, and anterior chamber and provides most of an eye's optical power.
•Iris: Pigmented tissue lying behind the cornea that gives color to the eye (e.g., blue eyes) and controls amount of light entering the eye by varying the size of the pupillary opening.
• Pul: Variable-sized black circular opening in the center of the iris that regulates the amount of light that enters the eye.
• Lens, crystalline ns: The eye's natural lens. Transparent, biconvex intraocular tissue that helps bring rays of light to a focus on the retina. Cataracts usually form in the Lens.
• Reta: Light sensitive nerve tissue in the eye that converts images from the eye's optical system into electrical impulses that are sent along the optic nerve to the brain. Forms a thin membranous lining of the rear two-thirds of the globe.
• Macu: Small central area of the retina surrounding the fovea; area of acute central vision.
• Optic nee: The nerve of the eye; carries impulses for sight from the retina to the brain.
• Vitreous, vitreous huor: Transparent, colorless gelatinous mass that fills the rear two-thirds of the eyeball, between the lens and the retina.