Basic principles of lens fracture testing.
An analysis of different tests used or proposed for evaluation of the resistance of ophthalmic lenses to breakage is presented. The tests considered subject the lenses to different strain rates, areas under stress, and energy losses. The analysis examines effects of these variables as well as effects of differences in lens-failure stress and lens thickness on test results.
D005139:Eyeglasses / Q000592:standards*; D005898:Glass / Q000592:standards; D006801:Humans; D013314:Stress, Mechanical; D013718:Tensile Strength