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We conducted a prospective study of 164 patients aged 70 and over who had undergone cataract removal and intraocular lens implantation to determine variables which predicted change in physical function experienced by the patients one year after cataract surgery. Path analysis was used to estimate direct and indirect effects of ADL change. Direct effects were estimated for mental status (-.35), mental status change (.51), binocular visual disability (-.39), binocular visual disability change over one year (.51), and baseline ADL (.36), with 45% of variance explained. Age and baseline mental status had important indirect effects through mental status change, and presurgical visual disability had important indirect effects through both visual disability change and mental status change. In summary, change in level of function one year after cataract surgery was not explained solely by change in vision, but was conditional on baseline function and baseline mental status and mediated in part by change in mental status.
Elam et al. (Thu,) studied this question.