One of the repeating cycles I go through, is the day after I cut my lawn, my right eye gets cloudy for the next four days. Then when I go, shopping, by the time I get there, 2 mi, it gets cloudy again. After I finish shopping, in 2 more days, I will have to cut the lawn again. It's environmental, as when took a vacation to Maui for 30 days, at the end, I didn't need contacts nor glasses for the last week.