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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 |
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Anisometropia |
When the Rx of each eye differs significantly |
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Fresnel lens |
Thin sheet of plastic that deviates the light |
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Ametropia |
Generic refractive error of the eye |
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Antimetropia |
A condition in which one eye has a refractive error of plus and the other a minus |
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Aniseikonia |
An image appears dissimilar in size and shape upon the retina of the two eyes |
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Emmetropia |
Perfect vision of 20/20 |
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Front vertex power |
Measurement of dioptric power when viewed through the lenses from the patient’s perspective |
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Iseikonic lenses |
Used to correct anisometropia and aniseikonia |
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Asthenopia |
Eye strain |
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Positive face form |
Frame front conforms to the natural shape of the head |
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Negative face form |
Frame front contradicts the natural shape of the head |
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Press on add |
Plastic bifocal segment which can adhere to the back of the lens |
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Eikonometer |
Instrument used to measure aniseikonia |
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Image jump |
The sudden displacement of an image as the bifocal line is crossed by the eye |
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Coquille lenses |
Plano or demo lenses, a French word meaning shell |
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Crazed lens |
Cracked in appearance caused by damage or defect |
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Myodisc |
High minus lens with a lenticular design |
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Lenticular |
A lens with the refractive power in the center and a flat plano carrier on the periphery |
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Parallax |
The apparent change in position of an object as the result of a change in viewing angle |