low vision

Term usually used to indicate vision of less than 20/200. May require additional optical aids, especially for near point tasks.

Macula

Central part of the retina. Composed uniquely of cone cells and enables precise vision.

Macula, macula lutea

The central portion of the retina that is responsible for central vision. An insult to the macula can cause loss of central vision and a significant decrease in visual acuity.