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

Against-the-rule astigmatism

Eyewear; Optometry

With the rule astigmatism has an axis of about 180 degrees (when Rx is written in minus cylinder form). "Against the rule" astigmatism has the axis at about 90 degrees. Both forms are common. ...

Aphakia

Eyewear; Optometry

The absence of the eye’s natural crystalline lens, usually after cataract removal.

Plano

Eyewear; Optometry

No refractive error. Normal vision. A diopter of 0.

Humanitarian device exemption

Eyewear; Optometry

A Humanitarian Device Exemption from the Food and Drug Administration authorises the use and marketing of a device that is intended to benefit patients in the treatment of conditions that affect ...

Thick, plus-powered eyeglasses that were once the standard correction for optical power following extraction of cataract. The glasses were cumbersome and greatly distorted peripheral vision. Today, ...

Point spread function (PSF)

Eyewear; Optometry

Often used in wavefront diagnostic analysis. A single round spot of light becomes diffused when it passes through an aberrated element such as a human eye. Aberrations cause some of the light to ...

Hyperopia

Eyewear; Optometry

Also known as farsightedness or longsightedness. Hyperopia occurs when the eyeball is too short from front to back, or the eye's focusing mechanism is too weak, causing light rays to be focused ...