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Vision Disorders

Other Causes

Many people, especially males, experience color blindness, varying degrees of which range from inability to differentiate between red and green to total inability to see one or more colors. Damage to any area in the visual pathway—including the optic nerve, optic tract, optic chiasm, optic radiations, or visual cortex—will cause vision deficits or loss. Although not vision disorders themselves, diseases, disorders, and damage of the eye lid, eye, and bony orbit (eye socket) may—if severe and left untreated—result in reduced, impaired, or lost vision.

See also Blindness and visual impairments; Radial keratotomy.


Resources

Books

Bankes, James L. Kennerley. Clinical Ophthalmology—A Text and Colour Atlas. London: Churchill Livingstone, 1994.

Chawla, Hector Bryson. Ophthalmology. London: Churchill Livingstone, 1993.

Stein, Harold A., Bernard J. Slatt, and Raymond M. Stein. Ophthalmic Terminology-Speller and Vocabulary Builder. St. Louis: Mosby, 1987.


Marie L. Thompson

KEY TERMS

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Astigmatism

—Irregular curvature of the cornea causing distorted images.

Cataract

—Eye disease characterized by the development of a cloudy layer in the lens of the eye.

Diplopia

—Double image.

Dystrophy

—Atrophy, deterioration.

Fundus

—Layers lining the inside of the eye.

Glaucoma

—A disease of the eye in which increased pressure within the eyeball can cause gradual loss of vision.

Hyperopia/presbyopia

—Far-sighted; close objects are out of focus.

Keratoconus

—Thinning of the cornea.

Moypia

—Near-sighted; distant objects out of focus.

Stabismus

—Non-parallel eye axes.

Additional topics

Science EncyclopediaScience & Philosophy: Verbena Family (Verbenaceae) - Tropical Hardwoods In The Verbena Family to WelfarismVision Disorders - Refractive Errors, Hyperopia/presbyopia, Other Refractive Errors, Strabismus, Nonparalytic Strabismus, Paralytic Strabismus - Myopia, Astigmatism, Glaucoma, Secondary glaucomas, Degeneration of the macula, Retinal dystrophies