Hi. I'm online and happy to answer your question today.
Depending on the amount of prism needed and the frames she selects, prism glasses can be fairly expensive. I have seen some pairs of prism glasses that cost over $500.
I would shop around for glasses at various shops and compare prices. You can have the glasses Rx made at any optical service.
Does this make sense to you?
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I see that you are offline. I'll switch over to the Q&A system. This system works a lot like 'text messaging' but an email is sent to each of us anytime something is posted to this thread. We can continue to work on your question there..... :)