They squint and/or close their eyes when they have light-sensitive eyes. Usually albino leos do. People with light colored eyes such as blue, grey, and green tend to be very light-sensitive, too. I don't know much about albino people, but I'd assume it was the same.
I've often wondered the same thing about my leo. She bumps into things all the time, and acts like she's totally blind, but responds to movement and to light.... she's an albino snake eye...