A clinical study: plastic lens warpage.
This clinical study of ophthalmic plastic lens warpage reviews prior work and confirms the presence of warpage. However, there were no patient symptoms related to the warpage, especially if within the ANSI Z80.1 standards.
D005139:Eyeglasses / Q000592:standards*; D006801:Humans; D010969:Plastics / Q000592:standards*; D014481:United States
D010969:Plastics