Eye acuity......................?!
Question: Eye acuity......................?
Answers:
[Princ... ] is obviously a typical &$^%* American who has forgotten some of his training in becoming a scientist, let alone an optometrist
If the acuity value you've written is NOT a typing error, then 2/60 is very poor vision.
To explain what an acuity value means, the numerator is the test distance. In your niece's case, her test was conducted at 2 metres, and she saw a letter that was 'size' 60. To covert this acuity to a 'standard international' value, then 2/60 is equivalent to 6/180 or to (the archaeic US system of measuring in feet - test distance at 20 ft) of 20/600
Now a person with healthy 'normal' vision has 6/6 vision (or 20/20). Now if a normal person was to be tested at 2m, then their acuity would be 2/2. Your niece's 2/60... the size 60 letter is 30 times bigger than a size 2 letter.
So your niece can only see a shape that is 30x bigger than the smallest thing that a normal person can see.
Now if you've made a typing error, and your niece's acuity is 20/60, then it's only 3 times bigger. So she can only see things that are tripple the size of the smallest thing a normal person can see.
2/60 is not an acuity. do you mean 20/60?
try this: http://www.billauer.co.il/simulator.html
http://www.thevisioncommunity.com/index.…
on the 2nd one, drag the white "bar" to about "10"...thats about 20/60
optometrist
http://myeyepod.blogspot.com/