safety lens

safe·ty lens

a lens that meets government specifications of impact resistance; the increased impact resistance required for safety lenses is obtained by tempering, by an ion-exchange process, or by using laminated or plastic lenses.

safe·ty lens

(sāf'tē lenz)
A lens that meets government specifications of impact resistance; the increased impact resistance required for safety lenses is obtained by tempering, by an ion-exchange process, or by using laminated or plastic lenses.
References in periodicals archive ?
WeeTect Material Limited is safety lens and visor manufacturer for OEM businesses.
Heat treatment is a way of giving glass the suitable impact resistance required for use as a safety lens.
A safety lens is included and prescription can be accommodated.