Glossary of Terms

Astigmatism

Two points of focus in the back of the eye caused by unequal reactive error in one or more or the eyes optical media.

Bifocal

A spectacle or contact lens that corrects vision at two different distances.

Cataracts

Opacity that forms in the crystalline lens inside the eye and inhibits the ability of light to be focused properly in the back of the eye.

Glaucoma

A disease of the eye caused by light pressure inside the eye, resulting in damage to the optical nerve and leading to blindness if not properly treated.

Hyperopia

Farsightedness. A condition in which the power of the eye is too weak the length.

Macular Degeneration

Gradual loss of sensitivity of the area of the retina that provides central vision and results in a loss of the central visual field.

Myopia

Nearsightedness. A condition in which the power of the eye is too great for the length.

Presbyopia

A condition in which the crystalline lens inside the eye loses the ability to adjust and focus clearly up close.

UV

Ultra violet radiation is a range of wavelength this in the invisible spectrum of light. UV has harmful effects on the ocular tissues that absorb it.