At 1 year after surgery , 996 ( 83.0 % ) patients were followed up with an uncorrected visual acuity of 6/18 or better in 90.3 % of the foldable and 94.3 % in the rigid IOL group ( risk ratio ( RR ) 0.96 , 95 % confidence intervals ( CI ) 0.92-0 .99 ) .