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20 Cards in this Set
- Front
- Back
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Single vision |
Lenses correcting only one distance, near or far |
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Bifocal |
Lenses correcting for both distance and near vision |
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Trifocal |
Lenses correcting 3 distances with one lens |
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Multi-focal |
Lens having multiple powers to correct many distances in one lens |
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Image jump |
Sudden displacement of vision when a lined bifocal is crossed by the eye |
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PAL |
Lens that gradually progresses in power called a progressive lens |
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Segment |
Area added onto a lens called a bifocal |
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Double D lens |
Trifocal with intermediate portion on the top |
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Franklin bifocal |
Old fashioned executive lens where the segment line reaches all the way across the lens |
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Skull temple |
Most common used glasses temple |
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Library temple |
Straight temple used for easy on and off use |
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Cable temple |
Wrap around temple, hard to remove, great for active kids |
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A measurement |
Widest portion of measurement of frames eye wire |
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B measurement |
Deepest vertical measurement of the frames eye wire |
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DBL |
Distance between lenses, aka bridge size |
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ED |
Effective diameter, longest diagonal measurement of frames eye wire |
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Aspheric design |
Lens with multiple curves on front to achieve flatter, more cosmetic appealing effect |
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Hinge |
Metal hinge where temples are connected to the frame front |
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End piece |
Corners of the frame front where the hinge is embedded |
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Half eyes |
Glasses designed with very low b measurement so patient can easily look over glasses |
