| 摘要 |
A lens has two or more layered sections of thermoplastic material, and a substantially homogenous formation in which at least one of the layered sections has an active photochromic material present. The article is made by: forming a mould cavity (31) from first (27) and second (28) mould halves; loading the mould cavity with a first thermoplastic material; curing or partially curing that material; changing the second mould half to define a subsequent mould cavity in which the cured or partially cured material is present; loading the subsequent mould cavity with a subsequent thermoplastic material (32); and completing any uncompleted curing of the first and subsequent thermoplastic materials. At least one of the thermoplastic materials is loaded with an active photochromic material. |
