Time to see a new optometrist?

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How can my eyes be healthy when I need to wear glasses? Had my checkup yesterday, and my lenses needed updating as expected (I'm nearsighted.) My optometrist said that my eyes are healthy, though I can expect that I'll need stronger and stronger lenses as I get older. It didn't occur to me until after I left to ask him how can my eyes be healthy if I need corrective lenses, let alone lenses with a stronger prescription. Can anyone shed light on this? Google isn't bringing up anything. If you have any tips on supplements, foods, etc. that have helped you with your vision (if such things exist) I'd like to read more about them. :)