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

auxiliary lenses

Eyewear; Optometry

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

astigmatic difference

Eyewear; Optometry

Vertex power in the second principal meridian minus that in the first principal meridian.

astigmatic effect

Eyewear; Optometry

Collective description of the cylindrical power and the cylinder axis.

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.

astronomical telescope

Eyewear; Optometry

Compound optical system, afocal in normal adjustment, consisting of a positive objective element or group and a positive ocular element or group forming a magnified, inverted image.