A process in which millions of cells change light into nerve signals that tell the brain what the person is seeing. As a person reads, drives, and performs other activities that require fine, sharp, straight-ahead vision, light is focused onto the macula in the center of the retina, the light-sensitive layer of tissue at the back of the eye.
- Vision, low
Visual loss that cannot be corrected with eyeglasses or contact lenses and that interferes with daily living activities.
- Vision, macular
The macula is a special area in the center of the retina, the light-sensitive layer of tissue at the back of the eye. As we read, light is focused onto our macula. There, millions of cells change the light into nerve signals that tell the brain what we are seeing. This is called our macular […]
- Vision, tubular
Tubular vision; Tunnel vision.
- Visual acuity
The clarity or clearness of vision, a measure of how well a person sees.
- Visual acuity test
This test measures how well you see at various distances. It is the familiar eye chart test. The eye chart itself — the usual one is called Snellen’s chart — is imprinted with block letters that line-by-line decrease in size, corresponding to the distance at which that line of letters is normally visible. The letters […]