In 1961 one of the authors made a retrospective study, in which results obtained from 470 cataract operations performed by using zonulolysis and an equal number of the same kind of operations without zonulolysis were compared to each other (Castrtn 1961). It was verified then that there were noticeably better results with alphachymotrypsin. The following results reveal an especially significant statistical difference: 1) The ruptures of the lens capsules decreased in the enzyme group from 21 to 1 1 per cent. 2) Vitreous prolapses during the operation occurred in 13 per cent of the cases, but in the group, in which the enzyme was not used, the corresponding percentage was 23 per cent. 3) After the cataract extraction 74 per cent of the enzyme group and 66 per cent of the control group had good vision (0.5-1.6). 4) Four per cent of the enzyme group and eight per cent of the control group had final vision less than F.C. 1 m or blindness.In the same year that the study mentioned above was printed, Krwawicz published his cryoextraction method. Since then many results have been published about materials on which the procedure mentioned was used. But there are relatively few studies in which an attempt has been made to compare the
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