The adjusted hazard ratios ( HRs ) for association of progression to cataract surgery at @ years were : nuclear cataract increase of @ unit or more compared with less than @-unit change at @ years , @ ( @ % confidence interval -LSB- CI -RSB- , @-@ @ ; P < @ ) ; cortical cataract increase of @ % or more in lens opacity in the central @ mm of the lens compared with less than @ % increase at @ years , @ ( @ % CI , @-@ @ ; P = @ ) ; and posterior subcapsular cataract increase of @ % or more versus less than @ % in the central @ mm of the lens , @ ( @ % CI , @-@ @ ; P < @ ) .