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I have a new Tusa CEOS mask that I bought because it is possible to order prescription lenses in positive diopters for it without having them custom made. The downside (for me) is that my prescription is OD +3.5 OS +3.25 and the Tusa lenses are only available for my OS in either +3.0 or +3.5. So should I get the OS as +3.0 or +3.5. I suspect it won't make much difference one way or the other, but I wonder if anybody has an opinion?