I tend to squint if it is even a tad bright outside, but I never knew how tough even cloudy days were on the eyes. Last week, Anderson Cooper went temporarily blind, because he wasn’t protecting his eyes on an overcast day.

I found a good post on the NY Times today, covering this topic:
On an overcast day, Mr. Cooper, sans sunglasses, was filming a news segment on the water off the coast of Portugal.
Most people wear sunglasses on a sunny day.
But even on an overcast day, UV rays can pass through clouds and damage your eyes.
Like sand and water, fresh snow can also reflect UV rays on a cloudy day.
THE BOTTOM LINE Even on overcast days, UV rays can pierce through clouds and cause eye damage.

Source: Really? On a Cloudy Day, Your Eyes Can Be Sunburned — NYTimes.com.
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