Patent ID: 6070979
Filing Date: 2000-06-06
Classification: G02B,G02C

Abstract:
A plastic lens for spectacles with high refractive indices, comprising a plastic lens base of a polyurethane resin as obtained through polymerization of at least one polyisocyanate compound and at least one polythiol and/or sulfur-containing polyol, a primer layer of a polyurethane formed on said base lens, and an organosiloxane-type, hard coat layer having a refractive index of 1.47 or more formed on said primer layer; which is characterized in that said primer layer has a thickness sufficient for shock absorption, and that, when the thickness of the center part of the lens is from 0.7 mm to less than 1.2 mm, the lens is resistant to striking energy of not smaller than 4 times the striking energy value of the FDA Standard, 0.204 joules.