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Prismatic effect by lens
| Глоссарий терминов и сокращений по оптическим линзам |
When light goes through a wedge shaped lens which is called a prism, it bends. light is also bent when it does not go through the center of a lens. it commonly occurs when the pupillary distance (pd) is not measured or made correctly.
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Prismatic imbalance, английский
The difference in prism power in a pair of ophthalmic lenses at corresponding specified reference points.
Prism segment, английский
A straight-top glass bifocal lens with the “base in” prism ground in the segment portion only. prism thinning (equi-thin)– the reduction of inherent thickness in the upper portion of certain type of mutifocal lenses by grinding equal basedown prism in each lens of a pair; the lower portions in certain type lenses tend to be thinner than the upper portions. thickness and weight are reduced due this procedure causing a more pleasing pair of spectacles.
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