| abstract |
A method of producing a dioptric photochromic semi-finished lens, a diopter of which is to be imparted by grinding a concave surface of the semi-finished lens. Color concentration between a center portion and a peripheral portion is maintained at a fixed color concentration independent of the diopter of the lens and the lens is shockproof. In the method, after mixing a photochromic material with a thermoplastic polycarbonate resin to make a sheet, the sheet is processed to have a spherical surface sheet, set in a mold and thermoplastic polycarbonate resin is injected in the mold to be bonded with the sheet. |