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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 vision and near vision in one lens |
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Trifocal |
Lenses correcting three different distances in one lens |
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Multi-focal |
Lens having multiple powers to correct for many distances in one lens |
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Image jump |
A sudden displacement of vision when a lined bifocal is crossed by the eye |
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(PAL) |
Lens that gradually increases in power called progressive lens |
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Segment |
The area added on to an existing lens to make a bifocal |
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Double D lens |
A trifocal with the intermediate portion on the top of the lens |
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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 eye glass temple |
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Library temple |
Straight temple used for frequent easy on and off use |
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Cable temple |
Wrap around temple for hard to remove, great for active children |
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“A” measurement |
Widest horizontal measurement of the 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, also known as bridge size |
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ED |
Effective diameter, longest diagonal measurement of the frames eye wire |
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Aspheric design |
A lens with multiple curves on the front to achieve a flatter and more cosmetically appealing lens |
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Hinge |
Metal hinge where the temples are attached 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 a very shallow “B” measurement so the patient can look easily over the tops of the glasses |
