I'm just starting in this field and the info at work is nil or not enough. One ? is through what meridian will light pass undeviated with this rx t 2.50 -2.50 x150 is it 60? another concerns vertex. a -5.00 ou has a vertex at 10mm then the question is what's the power at the corneal plane at 0 Would it decrease in power? What is the corneal plane? I know, I know, well someone has to ask the dumb questions. ed
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