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press on prism

I have double vision without glasses and my glasses have press on prisms.  If I look straight ahead, I don't see double, but if I look slightly off straight ahead, say 10 degrees, I do.  Should I expect the prism to correct if I am not looking straight ahead?
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Avatar universal
Check with your eye doctor.  A press on prism is an inexpensive solution and can serve as a good diagnostic tool.  A true prism in your glasses may be more effective.  If you opt for new lenses, find an optometrist who will (within a specified time) remake lenses if you are not happy.  
Avatar universal
My glasses are new and do have the press on prism.  My question is whether the press on prism should only work when I look straight ahead.

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