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

Cylindrical power

Eyewear; Optometry

Plus or minus the astigmatic difference, depending on the principal meridian chosen for reference.

Cylindrical surface

Eyewear; Optometry

Part of the inside or outside surface of a cylinder.

Cylindrical test lens

Eyewear; Optometry

Lenses with cylindrical faces which are used to calibrate the axis marker and axis indicator with respect to the adjustment orientation of the rail.

Decentration

Eyewear; Optometry

Displacement of the centration point from the boxed centre of the shape of the edged lens.

Depth perception

Eyewear; Optometry

Perception of the distance at which objects points are located from the wearer.

Design reference point

Eyewear; Optometry

That point or those points, stipulated by the manufacturer, on the finished surface of a lens blank or on the front surface of the finished lens, at which the design specifications apply.