The study is the first to use "propensity matching," which tries to eliminate confounding variables at baseline--making it a key contribution to the relatively recent research into this potential interaction. There are a number of ways in which statins could be a marker for important confounder, including accessible healthcare and health insurance, as well as underlying risk factors such as smoking, diabetes, and older age--all of which are also risk factors for cataract.
These kind of variables may have been a factor in other studies that found the opposite effect (that statin use lowered risk of cataracts). However, with stronger evidence showing an increased risk of cataracts with statin use, the future for this popular class of drugs seems a little dimmer.
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Source: Association of Statin Use With CataractsA Propensity Score–Matched Analysis
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