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Biconvex
| Глоссарий терминов и сокращений по оптическим линзам |
A lens style where both the front and back surfaces are plus (convex).
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Двояковыпуклый, русский
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Bifocal, английский
A lens with two focal points, one for distance vision and one for near. regular bifocals have a line between the prescriptions; progressive bifocals change gradually from the near to far prescriptions with no visible line on the lens.
Biconcave, английский
A lens style where both front and back surfaces are minus (concave).
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