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I don’t have any answers about insurance for visual changes as I am able to use the VA for my issues.
However, I buy my glasses from deal sites like glassesonline . com or muukal . com. If you have single vision glasses and don’t need bifocals or prisms, you can often get a pair of glasses for under $20 if you get the sales frame and forego all the add-ons (like blue blocker).