Thank you for your quick response. Only 3 days in since this issue occurred but it appears just the one significant shift from -2.75 to +2.50 and now stable at the +2.50 but not sure. I did end up having a chalazion 2 days after vision change but went away after one day and no correction of vision. I will let you know if I end up getting a diagnosis so that maybe it can help you as well. Thanks.
My name is Jim and your description from Feb 26, 2020 describes my recent situation as well. Three days ago my left eye went from -2.75 to +250 overnight. I have been through numerous tests from two ophthalmologists including a neuro ophthalmologist with no identified reason for change in vision. Were you able to get a diagnosis for your condition? I am searching for what my next steps should be. I recently had a full blood work done and all parameters were in normal range.
I would suggest a test for diabetes called an A1c. Elevated blood sugar can cause unusual changes in the glasses prescription. Cataracts can also but they don't reverse and get better. same way with irregular astigmatism it doesn't get better. Some drugs can cause variable changes in glasses RX birth control pills, estrogens or being pregnant can. Topamax, a migraine medication can cause not only changes i glasses Rx but acute angle closure glaucoma.