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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.
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