What if , when the doctor says U have a vision of 20/50 ?

Whenever U and I go to the eye doctor, we are told that we are having short sight or if we are old enough, long sight.
Occasionally, we are told that we have astigmatism. Sometimes, when we age, doctors tell us that we have cataract. A more serious ailment is glaucoma. A common ailment working in dusty occoupations is blepharitis, or even inflammations of the eye lids.

As we read the prescription card, we read something like 6/6 or if u are in a Western country, 20/40 or 20/50 etc.,
What do all these mean?

Here is answers to your doubts and questions:
Please read fully.
http://www.websystem2.com/articles/13w_Eye_Exams_Part_1.asp?Doctor=drsmith