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Contact lenses

Epithelium

Eyewear; Optometry

The outer surface layer of the cornea, like the epidermis or outer layer of the skin.

Optic disc

Eyewear; Optometry

The circular area (disc) where the optic nerve connects to the retina. Also know as the optic nerve head.

Epithelium basement membrane dystrophy

Eyewear; Optometry

See Anterior Basement Membrane Dystrophy

Acuity

Eyewear; Optometry

Clearness, as in visual acuity. The most common measure of visual acuity is the Snellen acuity chart. Normal acuity being 20/20 (6/6 metric version).

Optic nerve

Eyewear; Optometry

The optic nerve is a bundle of nerve fibers, about the diameter of pencil, which passes through the back of the eyeball and connects to the nerve fibre layer of the retina. It can be observed ...

Optical zone

Eyewear; Optometry

The area of the eye through which light passes to the retina. To reach the retina light must pass through the cornea, aqueous humor, crystalline lens, and vitreous while passing through the pupil. ...

Zonules

Eyewear; Optometry

The fibres that hold the lens suspended in position and enable it to change shape during accommodation.

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