Eye surgery

Eye surgery

Industry: Eyewear

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Eye surgery

hemeralopia

Eyewear; Optometry

Day blindness. Loss of one half of the visual field in one or both eyes. Often caused by clouding or opacity of one or more of the normally clear ocular tissues.

Used in a diagnostic setting to differentiate whether reduced vision is secondary to uncorrected refractive error or to disease/amblyopia. By eliminating the peripheral light rays and concentrating ...

higher order aberration (HOA)

Eyewear; Optometry

A common eye examination and refraction evaluates low order aberrations (LOA). These are commonly called sphere (myopia or hyperopia) and cylinder (astigmatism). Only a wavefront diagnosis is able to ...

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 authorizes the use and marketing of a device that is intended to benefit patients in the treatment of conditions that affect ...

aphakic spectacles

Eyewear; Optometry

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 ...