4 Terms
Home > Industry/Domain > Eyewear; Health care > 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
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.
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.
Concave lens
Eyewear; Optometry
Lens which causes parallel incident light to diverge from a virtual focus. Also known as minus-power lens.
Abbe number
Eyewear; Optometry
Mathematical expression for determining the correction for chromatic aberration of an optical material of component.
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.
