This is also how you get snowblindness on cloudy days. The light intensity isn't high enough to cause your pupils to dilate the same way as on a sunny day, and

This is also how you get snowblindness on cloudy days. The light intensity isn't high enough to cause your pupils to dilate the same way as on a sunny day, and the snow reflects a bunch of UV into your eyes. So you get a sunburn on your retina.