Mah Jong Until My Eyes Bleed

I enjoy playing Mah Jong on my computer, even though I loose more time than I win.  The big problem is I start to have a hard time differentiating between the pieces.  Suddenly things get blurry, my eyes feel like they are going to drag themselves out of my eyes, and that can't be a pretty site. 

Also, the cat gets jealous. If Aggie doesn't get at least ten hours of petting she gets indignant.

Something like this: