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Do some cardio for your eyes
A previous study had linked regular running with a reduced risk of cataract development. Researchers wondered if walking had the same effect. They used data collected during a 6.2-yr follow-up from 32 610 runners in the National Runners Health Study II and 14 917 walkers in the National Walkers Health Study to compare the risk of being diagnosed with cataracts between the groups. Both regular runners and regular walkers had a statistically significant reduction in risk of developing cataract when compared to less active people and the risk reduction was not significantly different between the two activities, increasing activity totals increased risk reductions up to a certain level.