In college, I had my glasses on all the time. I wore glasses to formals, in a cappella performances, on the beach. (I took them off for yoga class, which means I learned virtually blind. It was difficult.) And almost without fail, when I was dressed up but also had glasses on, someone would ask me, "don't you have contacts?"
Have you been working hard for the last 5 hours? Your eyes are tired and your vision is difficult to concentrate, isn't it? This simple game will not only check your vision and your ability to see the latent images. It will allow you to do simple exercises for the eyes, and after 5 minutes you are ready to get back to work again!