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

Atoroidal surface

Eyewear; Optometry

Surface having mutually perpendicular principal meridians of unequal curvature, of which the cross-section in at least one principal meridian is not circular.

Back vertex focal length

Eyewear; Optometry

Distance in an optical system from the back surface to the focal point measured along the optical axis (axis of symmetry).

Auxiliary lenses

Eyewear; Optometry

Additional corrective lenses to facilitate access to higher refractive powers without an excessive numbers of lenses.

Balancing lens

Eyewear; Optometry

Lens fitted to a spectacle frame or mount to balance the weight and/or the appearance of the other lens.

Atoric lens

Eyewear; Optometry

Lens with astigmatic power in which at least one principal meridian is not spherical.

Back surface

Eyewear; Optometry

That surface of the spectacle lens intended to be fitted nearer to the eye.

Astigmatic power lens

Eyewear; Optometry

Lens bringing a paraxial pencil of parallel light to two separate line foci mutually at right angles and hence having vertex power in only the two principal meridians.