Vision suddenly blurry for near objects. wearing reading glasses to see somewhat but still not 100%. feeling pressure in my head too. possible cause?

See ophthalmologist: It is not feasible to provide a meaningful opinion without examining you and your symptoms warrant evaluation by a physician. It would be prudent to see an ophthalmologist, eye doctor, at your earliest.

Merits evaluation.: Possible causes include abnormal high or low BP, dehydration, fever, irregular heartbeat, embolism of blood clot or carotid artery plaque and more rare causes, including tumors or endocrine abnormalities. A thorough medical evaluation is likely to find the cause.