Delicate tissue that lines the inside of the eyelids and covers the front part of the eye except the cornea.
Glossary of Eye and Vision Terms
Common terms to help you learn more about your eyes and vision
Cornea
The clear curved structure that comprises the front of the eye, a refractive surface through which light enters.
Cross eyed
“Cross eyed” is sometimes used to describe a misalignment of the eye. The misalignment results from the failure of the eye muscles to work together. One eye, or sometimes both, may turn in (crossed eyes), turn out (wall eyes), turn up or turn down. Sometimes more than one of the ‘turns’ are present. Strabismus is
Degeneration
Tissue changes that make it less able to carry out its function.
Depth Perception
The blending of slightly dissimilar images from the two eyes for the perception of three–dimensional depth.
Detached Retina
Vitreous fluid, the gel-like material that fills the eyeball, is attached to the retina around the back of the eye. If the vitreous changes shape, it may pull away a piece of the retina with it, leaving a tear. Once there is a tear, vitreous fluid can seep between the retina and the back wall
Diabetic Retinopathy
Diabetic Retinopathy or Diabetes-related retinopathy occurs when small blood vessels leak and bleed in the retina. The retina is layer of the eye that acts like the film in the camera of the eye to help you see. Diabetes-related retinopathy is a leading cause of blindness in American adults and it affects over one in
Diopter
Metric unit used to denote the refractive error of the eye or lens.
Distance Vision
Ability to distinctly perceive objects at a distance, usually tested at 20 feet.
Eclipse Glasses
To view a solar eclipse safely and without damaging your eyes, solar eclipse glasses can help. Make sure they meet safety requirements and are manufactured with the ISO 12312-2 standard. Look for ISO standard labeling when looking for solar eclipse glasses and purchase them from a trusted source. Find out more about protecting your eyes