Have been short sighted all my life and worn glasses or lenses for years. Am now getting slightly longer sighted too, as detailed things are not quite as clear as they used to be when I'm wearing my lenses (though can see close up without them if I hold things at the end of my nose, which I've always had to do as I'm that short sighted).
I doubt it's dependence on the glasses. The lens in they eye is just less flexible with age and can't focus as accurately. Anyway, if you stop wearing the glasses, the headaches may come back...
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