constringence

(redirected from V-value)
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constringence

[kən′strin·jəns]
(optics)
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References in periodicals archive ?
Every lens supplier offers products made of CR39 as this material has a good optical quality, with a high V-value and is easy to surface, edge, drill and coat.
Trivex[TM] has a high impact resistance, and due to the crosslink design has a much better chemical and stress resistance than polycarbonate, coupled with an acceptable V-value of 43.
The dispensing of Trivex will help to reduce chromatic aberrations, compared with polycarbonate, as it has a higher V-value of 45.