Optometry

Optometry

A health care profession concerned with eyes and related structures, as well as vision, visual systems, and vision information processing in humans. The practice of eye and vision care.

Industry: Eyewear; Health care

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Optometry

concave lens

Eyewear; Optometry

Lens which causes parallel incident light to diverge from a virtual focus. Also known as minus-power lens.

condensing lens

Eyewear; Optometry

A convex lens used to condense the illuminating beam into the patient's eye and to form a real inverted image of the retina thus illuminated.

contrast

Eyewear; Optometry

Ratio of the differential luminance to background luminance.

lens blank

Eyewear; Optometry

Piece of material, usually preformed, for the making of a lens at any stage before completion of the surfacing processes.

Agreed distance of 250 mm between the object side (first) nodal point of the eye and the object observed. The reference seeing distance is used, above all, as a reference parameter for calculating ...