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Double segment bifocals
| Глоссарий терминов и сокращений по оптическим линзам |
Lenses with segments at the top and bottom of the lens. suited for those who require near focal length above and below the head.
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Down bend, английский
The drop or downward bend of the tip end of a temple (earpiece) to fit over and around the ear; also known as the ear bend.
Double convex lens, английский
A biconvex lens of special form having bulging surfaces of equal radii on both sides of the lens.
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