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Bifocal
Глоссарий терминов и сокращений по оптическим линзам |
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.
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Progressive, английский
A 1 длительный; 2 про- грессивный (ант. regressive) aspect, assimilation, dissimilation
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Binocular pd, английский
The single measured distance from pupil center to pupil center. binocular (binocularity) vision – the blending of the separate images by each eye into a single image; allows images to be seen with depth.
Biconvex, английский
A lens style where both the front and back surfaces are plus (convex).
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