I'm now finding that when I'm tired I can't see well at all, it all gets very blurry.  That limits what I can do very much.  Thank heaven that I can knit okay, especially if it's all knit or an easy repeat that I don't need to read clearly to keep up with (like 8 lines of pattern).   

Further, it is painful to be in the car at night without my sunglasses.  The headlights from the oncoming cars hurts a lot.  Didn't know your eyes can hurt.......they can.  Wearing shades helps a great deal.  And I'd have been better off if I'd worn them in a brightly lit restaurant where the light was painful.  It just seemed rude to leave them on, though the people I was with would not have objected (too much anyway).

The over the counter eye-drops are magic.