A member asked:
Why is my contact lens and glasses prescription different?
5 doctors weighed in across 3 answers
Distance from cornea: Contacts sit directly on the cornea so their magnification power is different than lenses in glasses that are in front of the cornea.
Answered 8/26/2014
5.7k views
Also: How contact lenses correct astimatism is different from how glasses do it. This requires a different prescription for each.
Answered 8/26/2014
5.4k views
Numbers game: Fitting cl is an art form as much as science. When the eyeglass refraction is placed in a cl if the number is large enough the strength of the contact may be different to cause good vision. The fit can also change the numbers. These are called "fudge factors'. The numbers are not as important as the ability to see wella nd comfortably.
Answered 9/10/2013
5.4k views
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