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Old 04-27-2010, 12:42 PM
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Join Date: Jan 2010
Posts: 34
Default Can you figure out this question for me?

What do you know about prism? It was a week ago that my uncle told me that his eyes had been suffered from some special vision problem, and there need to be a prism in his lens, he didn’t know it at all, and I just want to know why do some progressive lenses have prism? Does everyone need prism for their prescription glasses?
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