Are you wearing prescription glasses? If so.....your astigmatism is being accounted for in the lens. If you're wearing non-prescription glasses bought at the drug store then I would investigate this further. I've read that these do no harm, and I have an astigmatism. I have worn the drug store magnifying glasses for reading since my late 40's....at 61 that's still all I need and nothing for distance.....so it appears they have not harmed my eyes. If you're very concerned speak with an eye doctor as to what is best for your needs. Hope this helps!
Our eyes are so precious, I can understand your concern for their health and safety. While we can help you with your anxiety relating to this, we do not have the qualifications to answer your question. I suggest you call your eye doctor and direct this concern to the one person who can answer it with authority.
Peace
Greenlydia