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Thread: VISION THREAD (other than colour vision) 2
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Old 4th May 2013 | 08:15
  #113 (permalink)  
Dr Jekyll
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Joined: Nov 1999
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From: London UK
The -3.5 is the amount of correction needed for you see as well as if you had no astigmatism in the first place, not a measure of how well or badly you can see.

In effect they are asking how strong your glasses are.
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