glossary

Age-related macular degeneration, a disease that damages the macula, the central part of the retina, leading to a loss of central vision and leaving only the peripheral or lateral vision intact.

Distortions, related to astigmatism , that cause the inability of light rays entering the eye to converge (come together) to a single focus point on the retina . Aberration are divided into two main categories: higher-order and lower-order. Optical system image defects; rays of light emanating from an object-point fail to form a perfect image-point.

Surgical removal of tissue, typically using a cool beam laser