Another simple way to test your blind spot:<p>1. Close your left eye.<p>2. Extend your right arm in front of you, perpendicular to your body.<p>3. Stick your thumb up, parallel to your body. It should be aligned with your right eye.<p>4. Keep looking straight ahead and slowly increase the angle on your arm, moving it to the right.<p>Your thumb will disappear from view, though you can still see your arm. Invert the left/right positions in the instructions for the other side.<p>Wikipedia also has a quick test: <a href="https://en.wikipedia.org/wiki/Blind_spot_(vision)#Blind_spot_test" rel="nofollow">https://en.wikipedia.org/wiki/Blind_spot_(vision)#Blind_spot...</a>