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Old 02-22-2010, 02:51 AM
Junior Member
 
Join Date: Jan 2010
Posts: 27
Default How do you know about prism?

This is not my first time to order prescription eyeglasses, why did my optician ask me if I need a prism in my lenses, I know other parameters, such as OS, OD, PD, but I never heard about prism, What does this parameter use for? And does everyone need prism for their prescription glasses? Why do some progressive lenses have prism?
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