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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Meniscus |
Lens having a convex surface on the front and concave on the back |
Lens having a convex surface on the front and a conca |
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Axis |
The axis orientates the sphere power of a compound lens |
The axis orientates the sphere of a compound lens |
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Base Curve |
Beginning front curve of a Lens on which the net power is based |
Beginning front curve of a lens on which the net power is based |
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Power Cross |
Schematic representation of the two major meridians of the lens power |
Schematic representation of the two major meridians of the lens power |
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Nominal Power |
Total or estimated power of the lens determined by the power cross |
Total or estimated power of the lens determined by the power cross |
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Regular Astigmatism |
Non spherical cornea which has its two major curves 90 degrees apart |
Non spherical cornea which has its two major curves 90 degrees apart |
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Irregular Astigmatism |
Non spherical cornea where the two meridians are not 90 degrees apart |
Non spherical cornea where the two meridians are not 90 degrees apart |
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Compound Myopic Astigmatism |
When light entering an eye is broken into 2 different focal points, & both of them come to point, focus before the retina |
When light entering an eye is broken into 2 different focal points, & both of them come to point, focus before the retina |
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Compound Hyperopic Astigmatism |
When light entering an eye is broken into 2 different focal points , & both of them come to a point of focus after the retina |
When light entering an eye is broken into 2 different focal points , & both of them come to a point of focus after the retina |
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Mixed Astigmatism |
When light entering an eye is broken into 2 different focal points & one ray comes to a point focus before the retina & the other Ray after the retina |
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Isometropia |
The same refractive error in both eyes |
The same refractive error in both eyes |
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Antimetropia |
The refractive power is a plus in one eye and a minus in the other eye |
The refractive power is a plus in one eye and a minus in the other eye |
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CR-39 |
Common plastic lens material with an index of 1.490 |
Common plastic lens material with an index of 1.490 |
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Crown Glass |
Common glass lens material with an index of 1.523 |
Common glass lens material with an index of 1.523 |
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Trivex |
Strong light weight lens material with an index of 1.530 |
Strong light weight lens material with an index of 1.530 |
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Polycarbonate |
Bullet proof, light weight lens recommended for children w/ an index of 1.589 |
Bullet proof, light weight lens recommended for children w/ an index of 1.589 |
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High Index |
A material with an index number that is higher than the average 1.530 |
A material with an index number that is higher than the average 1.530 |
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Abbe Value |
An index to measure the chromatic aberration or clarity of a lens material |
An index to measure the chromatic aberration or clarity of a lens material |
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Ametropia |
Generic for a refractive error |
Generic for a refractive error |
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Plano |
No lens power needed |
No lens power needed |
