Gradual blur in both eyes usually means a prescription update, dry eyes, or strain. Sudden blur, one eye, a curtain over vision, or blur with weakness or slurred speech is an emergency.
What to do
Common questions
What does it mean if my vision is blurry?
Blurry vision splits neatly into slow and sudden. Slow blur - creeping over months - is usually just your eyes: an outdated glasses prescription is the most common answer, and NEI notes refractive errors like nearsightedness, farsightedness, and astigmatism are the leading cause of blurry vision overall. After 40, the near-focus loss of presbyopia arrives on schedule. Dry eyes and screen strain blur things temporarily and improve with breaks and artificial tears. In older adults, gradual blur with glare trouble suggests cataracts, and gradual central blur suggests macular degeneration. Sudden blur plays by different rules. Blurry vision in one eye that comes on over minutes, blur with a curtain or shadow over part of your vision, blur with severe headache, or blur with weakness, numbness, or slurred speech - those are emergency patterns. High blood sugar also blurs vision, which is why new blur plus big thirst and frequent urination deserves a diabetes check. The practical split: gradual, both eyes, better with a blink or a break - book a routine eye exam. Sudden, one eye, or with other symptoms - urgent care or the ER today. Pymander is a free AI doctor, 24/7 by text. Describe the onset and which eye, and it can help you judge routine versus urgent.