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> Also, as far as I can recall, astigmatism is present at birth and not developed over time like some other eye conditions.

No, it's definitely not present at birth (at least to the same degree) and can be acquired during child development and even early adulthood.

I have astigmatism and now presbyopia too so if I remove my glasses and try to see if they magnify or reduce thing I'm not able to see because I can't see without my glasses. lol

Yep, I have astigmatism. I spent my childhood more outdoors than indoors but I already had it.

Only started to get dioptries at 30 ish but the astigmatism was with me all my life.