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So I need prescription sunglasses. I've never owned them before. I stopped at the nearest place and listened to the sales pitch. I have a few questions.
1) I was told that some frames and lens shapes aren't conducive to RX'ing- too much of a curvature is contrary to an even lens whatever, sight image I guess. Is this true? How do I know before deciding on frames if they're good targets for medicated lenses?
2) Are the gradient lenses any less protective? It seems like a nice feature to be able to glance down and get a true-to-color view, but are these going to be less useful in helping to protect my light-sensitive eye?
3) Can I purchase any popular frame and have the lenses RX'd elsewhere?
I know these 'order online and try on for free' websites are all the rage but a) I don't know whether they're all that great; their RX'able sunglasses sections seem much smaller than the rest of their catalog and b) a lot of glasses shops offer discounts on frames if you purchase there after your examination.