People with low vision have reduced vision, even when using the best possible corrective lenses. Low vision may be a result of either congenital disease such as retinitis pigmentosa or Leber’s congenital amaurosis or of an acquired conditions such as optic atrophy. It is treated within a subspecialty of optometry and ophthalmology called “low vision”.
When vision cannot be improved with regular eyeglasses, medicine or surgery, people with low vision need help to learn how to make the most of their remaining sight and keep their independence. Losing vision does not mean giving up your activities, but it does mean finding new ways of doing them.
Patterns of vision and vision loss
This is the detailed vision we use when we look directly at something. Macular degeneration (AMD) affects central vision. Diabetic retinopathy can affect central or peripheral vision.
This is the less detailed vision we use to see everything around the edges. Glaucoma affects peripheral vision first. Strokes can affect one side of the peripheral vision.
This is the ability to distinguish between objects of similar tones like milk in a white cup or to distinguish facial features. All eye problems can decrease contrast sensitivity.
This is the ability to judge the position of objects. New vision loss in one eye can affect depth perception, such as the height of a step.
The lens in our eye focuses light rays onto our retina. The retina converts these light rays into signals that are sent through the optic nerve to our brain, where they are interpreted as the images we see. A problem with any of these processes affects our vision in various ways.