Often confusing!!: 20/30 means that 20 feet from the eye chart, your vision is as good as a normal person's standing 30 feet from the chart! a good rule of thumb is to use your vision measurement as a percentage of normal vision. So 20/30 would be 66%, 20/40 equal to 50%, 20/20 equal 100%, etc! so your vision is less than perfect! good idea to have it checked out!
Answered 3/5/2013
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