I have a patient with +0.25 OU and 1.50 BI prism 60/57 PD. I thought I would just pull some stock lens, but I could not move the lens enough to get the 1.5 BI prism. I ended up ordering from the lab. Is there a formula where I could change her PD to induce enough prism in her glasses or is it just best to let the lab make the lens?
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