Low vision is the loss of sight that is not correctable with prescription eyeglasses, contact lenses, or surgery. Low vision does not include complete blindness, because there is still some sight. Low vision can be treated or offset, however, with the use of vision aids such as magnifying glasses.
Low vision includes different degrees of sight loss -- from having blind spots to almost a complete loss of sight. The American Optometric Association divides low vision into two categories based on the vision in the best eye:
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Here's where you can learn about the different types of lenses available in eyeglasses for various lifestyle activities.
1. Partially sighted, meaning the person's vision is between 20/70 and 20/200 with conventional prescription lenses
2. Legally blind, meaning the person's vision is no better than 20/200 with conventional correction or a restricted field of vision less than 20 degrees wide
Low vision is a result of a variety of conditions and injuries, but age is a factor. Macular degeneration, glaucoma, and cataracts are more common in people over age 45 and even more so in adults over age 65. It is estimated that some 14 million Americans suffer from vision impairment.
The most common types of low vision include:
Loss of central vision. A condition in which there is a blind spot in the center of one's vision
Loss of peripheral (side) vision. An inability to see anything to either side and above or below eye level; central vision, however, remains intact.
Night blindness. An inability to see in poorly lit areas such as a theater, as well as outside at night
Blurred vision. A condition in which objects both near and far appear out of focus
Hazy vision. A condition in which the entire field of vision appears to be covered with a film or glare
What Causes Low Vision?
Besides age-related retinal conditions, there are many other possible causes of low vision, including conditions such as glaucoma and diabetes. Low vision may also result from cancer of the eye, albinism, stroke, eye trauma or a brain injury. If you have or are at risk of having these disorders, you are at an increased risk for low vision.