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Biconcave
| Глоссарий терминов и сокращений по оптическим линзам |
A lens style where both front and back surfaces are minus (concave).
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Двояковогнутый, русский
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Biconvex, английский
A lens style where both the front and back surfaces are plus (convex).
Bevel edger, английский
A machine by which an uncut lens is given a bevel on its edge by a special lens grinding wheel. bi-centric grinding (slab off) – the process of grinding base up prism to correct vertical imbalance.
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