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I used to wear contact lens base curve 8.5 but now to 9? What does that mean?  

Answers:14   |   LastAnswerAt:06.12  

Question
visitor
CW 
Asked at 2011.04.02 02:28:52
What does it mean when my BC changed from 8.5 to 9? The increment is quite big
answer Dr. Bill  Answered at 2011.04.02 02:28:52
The change in curve has nothing to do with eye sight but with the fit of the lens which is the relationship between the back curve of the lens and the front curve of the cornea. 8.5 is considered a medium curve and the 9 is a flat curve. Normally the better fit is the flatter curve because it allows for more circulation of tears under the lens. If the lens is too unstable and won't center or moves around too much or pops out then it's too flat, and you need a medium curve.
answer
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