Eyewear

Eyewear

Eyeglasses, goggles or other objects worn over the eyes, usually to aid vision or for protective purposes.

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Eyewear > Optometry

photoreceptor

Health care; Optometry

A light-sensitive cell found in the retina. Photoreceptors in the human retina are classified as cones and rods. Cones are located in the central retina (the fovea) and control ...

corneal abrasion

Health care; Optometry

A loss of the epithelial layer of the cornea, typically due to minor trauma (contact lens trauma, a sports injury, dirt or another foreign body, etc. ). Symptoms include blurred ...

index of refraction

Health care; Optometry

A measure of how much a substance reduces the speed of light waves passing through it. The index of refraction (or refractive index) of a substance equals the ratio of the speed ...

nanometer

Health care; Optometry

A measurement of length equal to one-billionth of a meter. Abbreviated as nm. Wavelengths of light are measured in nanometers. Eyeglass and sunglass lens manufacturers use ...

ophthalmologist

Health care; Optometry

A medical doctor (MD) who specializes in the eye. Ophthalmologists perform eye exams, treat disease, prescribe medication, and perform surgery. They may also write prescriptions ...

corneal collagen cross-linking

Health care; Optometry

A medical procedure that involves the application of riboflavin (vitamin B2) eye drops and ultraviolet light to the eye to strengthen corneal tissue in an eye affected by ...