申请人:Menicon Co., Ltd.
公开号:EP1367067A1
公开(公告)日:2003-12-03
A highly water-absorptive ophthalmic lens which is formed of a macromolecular material including vinyl alcohol unit as a major component and whose water content is in a range of 50-90 %, characterized in that: the macromolecular material is a cross-linked vinyl alcohol-allyl alcohol/halogenated-alkyl ethylene copolymer which includes allyl alcohol unit and/or halogenated-alkyl ethylene unit, together with the vinyl alcohol unit; and the ophthalmic lens has a ratio of a dimensional change of less than ±2 % and being free from whitening after (A) the ophthalmic lens has been subjected to three cycles of a freezing-thawing operation wherein the ophthalmic lens formed of the macromolecular material is left at a temperature of not higher than -10°C for not less than twelve hours, and is subsequently left at a temperature in a range from 15°C to 30°C for not less than six hours, and/or (B) the ophthalmic lens has been kept at a temperature in a range from 1°C to 9°C for three months.
一种高吸水性眼科晶状体,它是由以乙烯醇单元为主要成分的高分子材料形成的,其含水量在 50-90 % 之间,其特征在于:大分子材料是交联的乙烯醇-烯丙基醇/卤代烷基乙烯共聚物,其中包括烯丙基醇单元和/或卤代烷基乙烯单元以及乙烯醇单元;(A) 将由该高分子材料形成的眼科学晶状体在不高于 -10°C 的温度下放置不少于 12 小时,然后再在不高于 -10°C 的温度下放置不少于 12 小时,在此过程中,该眼科学晶状体经受了三次冷冻-解冻操作循环,在此过程中,该眼科学晶状体的尺寸变化率小于 ±2%,且不会变白、(B) 眼科晶状体在 1°C 至 9°C 的温度下保存三个月。