作者将白内障病人分成两组:一组包括过熟及成熟白内障,视力≤20/200,均有相应的致密的前囊下或后囊下混浊(至少占囊的50%且/或有1～4级核硬化。对照组包括混浊不到前、后囊的一半且/或有相应核硬化的未成 The authors classify cataract patients into two groups: one group includes over-mature and mature cataracts with a visual acuity of 20/20, with correspondingly dense anterior subcapsular or posterior subcapsular opacities (accounting for at least 50% of the sac and / Grade 4 nuclear sclerosis. The control group consisted of less than half of the posterior and / or posterior capsular opacities and / or minor nuclear sclerosis