constringence

(redirected from V-value)
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constringence

[kən′strin·jəns]
(optics)
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References in periodicals archive ?
In Asia and the majority of Europe the market penetrance of this material is subdued by its low V-value, poor chemical resistance, and susceptibility to cracking, particularly on contact with metal.
6, prior to the development of the next generation, MR8, with a higher V-value.
It has a creditable V-value of 33 but can appear to have a yellowish tinge to the lens, is more brittle when drilled, and has a distinctive, unpleasant odour when being edged.
7 Rodenstock Lentoid Hoya Shamir Signet Armolite Jai Kudo Table 2 Properties of plastics lenses Index Lens type Density V-value UV abs 1.