The best one was left out the blind spot everyone has where the optic nerve connects. Wikipedia has a simple test: http://en.wikipedia.org/wiki/Blind_spot_(vis

The best one was left out the blind spot everyone has where the optic nerve connects. Wikipedia has a simple test: http://en.wikipedia.org/wiki/Blind_spot_(vision) http://en.wikipedia.org/wiki/Blind_spot_(vision)