Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
Distometer |
Tool used for measuring vertex distance |
|
Vertex distance |
The space measured in mm between the cornea and the spectacle lens |
|
Binocular P.D. |
Distance from the center of one pupil to another |
|
Monocular P.D. |
Distance from the center of the pupil to the center of the nose bridge |
|
Occluder |
Hand held device used to block vision |
|
Theoretical minimum blank size |
Smallest lens blank for a particular frame |
|
Zyl frame |
Common slang for plastic frame |
|
Ocular surface |
Back or concave side of the lens |
|
Convex surface |
Base curve or front of the lens |
|
Seg inset |
An automatic decentering inward of a bifocal seg, usually 1.5 mm |
|
Ultrasonic cleaner |
Used to clean frames by the sound waves in water |
|
Sphere power |
The primary correction power of a prescription lens |
|
Cylinder power |
The secondary power of a lens used to correct astigmatism |
|
PD stick |
Common mm ruler used to measure pd and frame measurements |
|
Pupilometer |
Device used to measure interpupillary distance |
|
Prentice rule |
Formula to find unwanted prism (dxD divided by 10=) |
|
Frame PD |
A measurement of a frame added to the DBL |
|
GCD |
Geometrical center distance (same size as frame Pd) |
|
Midline |
Pertaining to the nasal or center of the patients nose bridge |
|
Lensometer |
Instrument to find the power, prism and optical center of a lens |