Maybe they can't fix things like bad vision with magic. Perhaps things that are due to genes rather than infection/desease they can't fix with magic. I mean, if they could, wouldn't everyone be really hot? So maybe there are only temp solutions to things like hearing loss and bad vision, and so some wizards just choose not to worry about those useless spells most of the time and just wear glasses.
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Maybe they can't fix things like bad vision with magic. Perhaps things that are due to genes rather than infection/desease they can't fix with magic. I mean, if they could, wouldn't everyone be really hot? So maybe there are only temp solutions to things like hearing loss and bad vision, and so some wizards just choose not to worry about those useless spells most of the time and just wear glasses.