20/20 vision is a term
used to express normal vision. If you have 20/20 vision, you can see
clearly at 20 feet what should be normally seen at that distance. If you
have 20/100 vision, it means that you must be as close as 20 feet to see what a
person with normal vision can see at 100 feet.

20/100 uncorrected
vision means that is what you see without your glasses. If glasses don’t make
your vision any better, then your corrected vision is also 20/100. If glasses
improve your vision to normal, then you have 20/100 uncorrected vision but
20/20 corrected vision (with glasses).

20/20 does not
necessarily mean perfect vision. There are important vision skills, including
peripheral vision, eye coordination, depth perception, focusing ability and
color vision that contribute to our overall visual ability. 

Over the next few weeks,
I will write about flawed vision (color blindness, refractive errors) and
blindness (degrees of blindness, and causes of blindness). So stay tuned for
the next blog on EYES GONE WRONG.