Really?? 20/20 or 6/6 as it is in the uk refers to a patients visual aquity in the test room there's usually some kind of chart with different size numbers, letters or pictures these are given a distance i.e. 20 and the test is done at a distance of 20 hense the 20 line can be clearly seen at a distance of 20 feet hense the 20/20... your child could only see the 60 size hense 20/60 this could be either long sighted or short sighted or even astigmatism... the distances for the pictures are determinded by snellen (the man that invented the chart and how to determine visual probs) his perfected eyed assistant could see that pic from 60 feet whereas you child could only see it from 20. No need to worry though if the optician didn't prescribe glasses they may think his vision is still OK with out
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