Always invest in prescription glasses or goggles if you can. While choice specs sound like a good alternative on paper (as they do focus a pokémon’s eyesight enough to allow them to hone in on a target and thus hit them harder with long-distance techniques), the fact of the matter is that they’re not medical tools. Moreover, a set you find or buy at a local pokémart may not be attuned to your kadabra’s specific needs, as a set of prescription lenses might be.
(And wide lenses are not eyeglasses at all but rather more or less akin to a periscope.)
That having been said, most pokémon centers will help you choose lenses that would be right for your kadabra, if not connect you to a pokémon optometrist who might be able to assist you. I would recommend going back to your local Nurse Joy and asking for recommendations or a prescription.
Best of luck!