Hello all! I had a question about an Rx I received about a week ago. This was for over the patient's contact lenses for sunwear and it read plano w/ 2D BO prism O.U. At first, I thought this was an oversight (thinking back to Prentice's Rule), but after talking to a few opticians who've worked in the lab, they explained that it is done by keeping the same curve on the front and back (i.e. - same curve on both sides = plano), but tilting the back curve somewhat so that light would still be deflected. Before this, I have never heard of that, and didn't know if someone could help elaborate.
Thanks!
William
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