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20 Cards in this Set
- Front
- Back
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Distometer |
Tool used for measuring vertex distance |
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Vertex Distance |
The space measured in mm between the cornea and the spectacle lens |
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Binocular P.D. |
Distance from the center of one pupil to another |
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Monocular PD |
Distance from the center of the pupil to the center of the nose bridge |
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Occluder |
Hand held device used to block vision |
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Theoretical Minimum Blank Size |
Smallest lens blank for a particular frame |
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Zyl Frame |
Common slang for plastic frame |
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Ocular Surface |
Back or concave side of the lens |
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Convex Surface |
Base curve or front of the lens |
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Seg Inset |
An automatic decentering inward of a bifocal seg, usually 1.5mm |
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Ultrasonic Cleaner |
Used to clean frames by sound waves in water |
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Sphere Power |
The primary correction power of a prescription lens |
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Cylinder Power |
The secondary power of a lens used to correct astigmatism |
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PD Stick |
Common mm ruler used to measure PD and frame meadurements |
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Pupilometer |
Device used to measure interpupillary distance |
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Prentice Rule |
Formula to find unwanted prism (dxD divided by 10=) |
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Frame PD |
A measurement of a frame added to the DBL |
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GCD |
Geometrical center distance (same size as frame pd) |
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Midline |
Pertaining to the nasal or center of the patient's nose bridge |
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Lensometer |
Instrument to find the power, prism and optical center of a lens |
