In a recent study published in Transitional Vision Science and Technology, researchers investigated the causal effects of physical activity (PA) on the risk of developing senile cataracts (SC). Give me some background first. Cataracts are one of the most common causes of vision loss in older individuals, affecting an estimated 95 million globally. Symptoms can include: Cloudy or blurry vision Colors appearing faded Trouble seeing at night Lamps, sunlight, or headlights appearing too bright Seeing a halo around lights Seeing double vision Needing to change the prescription of glasses or contacts often In relation to this research: SC—also referred to as age-related cataracts—commonly occurs due to aging. Now, talk about the study. Investigators utilized a bidirectional two-sample Mendelian randomization (MR) approach for their analysis. Several methods were used in their analyses, including: Primary analysis Inverse variance weighted method Secondary analyses MR-Egger regression ...