Prognosis for Astigmatism Without Corrective Lenses

I have been diagnosed with astigmatism (-0.75 in the right eye; -2.00 in the left). My vision is not perfect, but I don’t feel I need glasses. I don’t have headaches even though I read a lot and work on a computer. Occasionally, I skip a line of the text I’m reading, but that doesn’t bother me. My doctor told me I must wear glasses, otherwise my condition could worsen. Is that true? Is there any health risk to not wearing glasses?

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