how does wearing glasses slow my vision from getting worse?
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In general, vision changes are the most extreme in childhood and adolescence, and become more stable during adulthood. More stable does not mean unchanging, plenty of people still experience worsening vision, but the changes might be smaller. For example, when I was younger, my vision prescription would basically double every year. While it is still going up, the changes are much smaller now, even when accounting for how high my prescription is.
Not wearing glasses when you need them causes eye strain and headaches and in children it might cause eye problems like lazy eye, but it won’t change how your vision changes. This is because nearsightedness is related to your eye shape and glasses have no impact on that.
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