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20 Cards in this Set

  • Front
  • Back

Vertical imbalance

When the rx of each eye differs significantly when looking away from optical center in the vertical meridian

Anisometropia

When the Rx of each eye differs significantly

Fresnel lens

Thin sheet of plastic that deviates light

Ametropia

Generic refractive error of the eye

Antimetropia

A condition in which one eye has a refractive error of plus and the other a minus

Aniseikonia

An image appears dissimilar in size and shape upon the retina of the two eyes

Emmetropia

Perfect vision of 20/20

Front vertex power

Measurement of dioptric power when viewed through the lenses from the patients perspective

Iseikonic lenses

Used to correct anisometropia and aniseikonia

Asthenopia

Eye strain

Positive face form

Frame front conforms to the natural shape of the head

Negative face form

Frame front contradicts the natural shape of the head

Press on add

Plastic bifocal segment which can adhere to the back of the lens

Eikonometer

Instrument used to measure aniseikonia

Image jump

The sudden displacement of an image as the bifocal line is crossed by the eye

Coquille lenses

Plano or demo lenses, a french word meaning shell

Crazed lens

Cracked in appearance caused by damage or defect

Myodisc

High minus lens with a lenticular design

Lenticular

A lens with the refractive power in the center and a flat plano carrier on the periphery

Parallax

The apparent change in position of an object as the result of a change in viewing angle