There are four major types of vision impairments. The first type are refractive errors. It is cause by the change of shape or size of the eyeball, conera or the lens. Myopia (short-sighted) and hyperopia (long-sighted) are two common examples. People with myopia or hyperopia cannot focus image accurately on the retina. Another example is astigmatism, it is caused by the abnormal curve sha

The second type are ocular motor problems. It is caused by irregular movement of the ocular muscles that control the movement of the eyeballs. It leads to the inability for the eyes to control focusing objects. Strasbismus is an example. This condition effects about 2 percent (2 out of 100) of all young children. Strabismus is a lack of coordinated muscle movement or focusing ability between the eyes, causing the eyes to point in different directions. One or both eyes may turn inward (crossed eyes) or outward ("walleye"). The eyes, the brain area that controls vision, and the muscles attached to the eyeball are involved. It result in the child that looks in certain directions, double vision (sometimes), vision in one eye only, with loss of depth perception. Strabismus can affect both sexes, all ages, but it usually begins during early childhood, frequently before age 5. If not corrected through therapy or surgery, crossed eyes can result in permanent loss of vision.

The third type are eye diseases, it is "caused by damage or dis

Some common words found in the essay are:
Winzer370 Vision, Impairments People, color blindness, vision impairments, vision eye, double vision, visually impaired, crossed eyes, blurred vision,
Approximate Word count = 698
Approximate Pages = 3 (250 words per page double spaced)