How is the 12mm distance between the spectacles and the cornea compensated for during a pre-LAISK evaluation?
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Doctor Answers 1
Lasik correction is achieved near the cornea surface, just as with contact lenses. Measurements obtained with spectacles, which are 12 millimeters from the corneal surface, are mathematically converted to the appropriate measurements at the corneal surface, which can be around an 8% difference.