Blurred vision means things look out of focus or hazy. Most blurring that comes on slowly is caused by something an optometrist can find and often fix. Common examples are short or long sight, astigmatism, dry eyes and, in older adults, cataracts.
Some blurring is an emergency. If you suddenly lose sight in one or both eyes, or have sudden severe eye pain, call 112 or 999 in Ireland, 999 in the UK or 911 in the US. Do the same if blurred vision comes with any stroke sign, even if it passes.
A new change in your vision should be checked soon, not left. The NHS advises an urgent GP appointment or NHS 111 for changes such as blurred vision. If your sight has slowly got worse over months, an optometrist (optician) is usually the right first stop. This page covers blurring. If you are seeing two images of one thing, see our guide to double vision.
Get help now
Call 112 or 999 in Ireland, 999 in the UK or 911 in the US, or go to an emergency department, if:
Call even if the symptoms have stopped. Do not drive yourself.
Get an urgent GP appointment the same day (out-of-hours GP if needed, or NHS 111 in the UK) if you have:
See an optometrist (optician) if:
People use "blurry" for different things. Tell the person assessing you which fits best:
Also say whether it affects one eye or both. Cover each eye in turn to check.
MedlinePlus describes presbyopia, difficulty focusing on close objects, as very common. It often becomes noticeable in your early to mid-40s.
An eye test with an optometrist finds these problems. The NHS advises an eye test at least every 2 years.
The NHS says many people get dry eyes and it is not usually serious. Eyes can feel itchy, sore, gritty or red, and vision can be blurry. They may also be sensitive to light or more watery than normal.
Dry eyes are more likely if you are over 50, wear contact lenses or use screens for long periods without a break. Air conditioning, heating, smoking and some medicines also play a part. Blurring from dry eyes often clears when you blink.
A cataract is when the lens inside your eye becomes cloudy. The NHS says symptoms usually develop slowly. They include blurred vision, difficulty seeing at night, glare, faded colours and halos around lights.
Cataracts are more likely if you are 60 or over, smoke, have diabetes or have taken steroids long term. Surgery to replace the cloudy lens is offered when they affect daily life.
MedlinePlus says medicines may affect your vision. The NHS lists some antidepressants and blood pressure medicines among causes of dry eyes. The NHS also lists blurred vision as a common side effect of oxybutynin, a bladder medicine. MedlinePlus puts it in a group called anticholinergics, which we explain in anticholinergic burden and brain fog.
Do not stop or change a prescribed medicine yourself. Ask your GP or pharmacist whether it could be the cause.
The NHS says some people get warning signs before a migraine, called aura. These include problems with sight, such as zigzag lines or flashing lights. Aura should not last longer than 1 hour.
The NHS advises an urgent GP appointment or NHS 111 if aura lasts longer than 1 hour. It advises calling 999 if a headache comes with loss of vision, or blurred or double vision. If you are not sure it is your usual aura, get help. Our guide explains how migraine differs from other headaches.
The NHS lists blurred vision among the symptoms of type 2 diabetes. Others include feeling very tired, peeing more than usual and feeling thirsty all the time.
Diabetes can also damage the back of the eye (diabetic retinopathy). The NHS says this usually has no symptoms at first, which is why regular eye screening matters. In people who take insulin or some other diabetes medicines, low blood sugar can also blur vision.
AMD affects the middle part of your vision, not the edges. The NHS says the first symptom is often a blurred or distorted area in the centre of your vision. Straight lines may look wavy. AMD is not painful.
The NHS advises an urgent optician appointment or NHS 111 if your vision suddenly gets worse.
The NHS describes uveitis as a rare condition that causes inflammation inside part of the eye. Symptoms include eye pain, redness, blurred vision, sensitivity to light and floaters. It needs urgent treatment to avoid long-term problems. See our guide to light sensitivity for other causes of painful, light-sensitive eyes.
Optic neuritis is inflammation of the nerve that carries signals from the eye to the brain. MedlinePlus says it can cause loss of vision in one eye over an hour or a few hours. Pain on moving the eye and faded colours are other signs.
It has been linked with multiple sclerosis (MS) and other conditions. The NHS lists blurred vision or eye pain among common MS symptoms. MedlinePlus advises contacting a doctor right away for sudden loss of vision in one eye.
The NHS lists blurred vision or flashing lights among the symptoms of pre-eclampsia, with a severe headache, pain below the ribs and sudden swelling. It is most likely from 20 weeks of pregnancy, but can develop after birth.
MedlinePlus suggests thinking about these questions before your appointment:
MedlinePlus says your vision, eye movements, pupils, the back of the eye and eye pressure will usually be checked. Tests may include a test for glasses, a slit-lamp examination and drops to widen the pupils.
The NHS says an optician or GP will refer you to an eye specialist (ophthalmologist) if they suspect an eye condition. A GP may also check your blood sugar or blood pressure if the history points that way.
For gradual blurring, book an eye test with an optometrist. For urgent problems, contact your GP or an out-of-hours GP service; our guide to out-of-hours GP and urgent care in Ireland explains the options. In Dublin, the Royal Victoria Eye and Ear Hospital runs an eye emergency department. In November 2026 its website asked patients to get a referral from a doctor or optician, or phone 01 664 4600 first.
Long periods at a screen without breaks make dry eyes more likely, and dry eyes can blur. Tired eyes after close work can also be a sign of long sight. If it keeps happening, have an eye test.
Many causes can affect one eye, including cataract, uveitis, optic neuritis and a detached retina. Sudden blurring in one eye, especially with pain, floaters or a shadow, needs help the same day. Sudden loss of sight is an emergency.
For blurring that has crept up over months, start with an optometrist. For a new or sudden change, eye pain, redness, floaters or a shadow, get same-day advice from a GP or urgent care. For any sign in the "Get help now" box, call 112, 999 or 911.
This article is general information, not medical advice. It cannot diagnose the cause of your symptoms. If you suddenly lose vision, call 112 or 999 (Ireland), 999 (UK) or 911 (US). Talk to your GP, optometrist or pharmacist before starting, stopping or changing any medicine.
Reviewed by: Proco Team
Last updated: November 2026