There are so many methods of eye tests are available
The following is ALZEIMERS EYE TEST
"Count every "F" in the following text quickly without break:
FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS....
WRONG, THERE ARE 6....
NOT A JOKE!!!!!
READ IT AGAIN.
DO YOU KNOW WHY?
THE BRAIN CANNOT PROCESS THE WORD "OF" IF YOU HAVE COUNTED CORRECTLY THEN YOU DONOT HAVE BRAIN