| 摘要 |
PURPOSE:To provide the intra-ocular lens which has excellent bioadaptability and UV absorptivity, is chemically stable and has the heat resistance to allow the steam sterilization in an autoclave by providing a lens part and a fixing part for fixing the lens pat into the eye and constituting the lens part of colorless transparent polyimide having a specific chemical structure. CONSTITUTION:This lens has the lens part and the fixing part for fixing the lens part into the eye. The lens part is constituted of the colorless transparent polyimide essentially consisting of the repeating unit expressed by general formula (1). In the formula, X denotes the group selected from the groups consisting of a directly coupled 1 to 10C bivalent chain hydrocarbon group, perfluoro(1- methyl ethylidene) group, carbonyl group, and thio group and the bond position of the nitrogen atom of the imide ring is a metha or para position with an ether bond. The lens part has the bioadaptability, is chemically inert, has >=1.6 refractive index and completely absorbs UV rays of 200 to 380nm region. |
