Here's some more fun stuff

How is your concentration now ? Take this Color / Word Test

You have to click the color not the word.  Your first score probably won't be good because you don't understand the game - your third try will probably be your best score - after that your score might go down because your eyes are tired or your brain "hurts". 

To Read this one Focus on the white

If you cannot decipher anything,

try pulling the corners of your eyes or pull your head to the side

and squint your eyes - then blink if necessary - it really works !!!!

Amazing Optical Illusions - See how everything seems to be moving... But of course it's not