Big Eye Quiz 1/21/05
Terms
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- Cornea
- The transparent convex anterior portion of the outer fibrous coat of the eyeball that covers the iris and the pupil and is continuous with the sclera.
- Iris
- The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.
- Pupil
- The apparently black circular opening in the center of the iris of the eye, through which light passes to the retina.
- Lens
- A transparent, biconvex body of the eye between the iris and the vitreous humor that focuses light rays entering through the pupil to form an image on the retina.
- Optic Nerve
- Either of the second pair of cranial nerves that arise from the retina and carry visual information to the thalamus and other parts of the brain.
- Near Sightedness
- Unable to see distant objects clearly
- Far Sightedness
- Abnormal condition in which vision for distant objects is better than for near.
- Retina
- A delicate, multilayered, light-sensitive membrane lining the inner eyeball and connected by the optic nerve to the brain.
- Cataracts
- Opacity of the lens or capsule of the eye, causing impairment of vision or blindness.
- Glaucoma
- Any of a group of eye diseases characterized by abnormally high intraocular fluid pressure, damaged optic disk, hardening of the eyeball, and partial to complete loss of vision.
- Astigmatism
- A visual defect in which the unequal curvature of one or more refractive surfaces of the eye, usually the cornea, prevents light rays from focusing clearly at one point on the retina, resulting in blurred vision.