What is blurry vision?
Blurry vision is when objects appear out of focus, hazy, or unclear. This common symptom can affect one or both eyes and may come on gradually or suddenly. While blurry vision can sometimes be temporary, it can also indicate an underlying eye condition that requires professional attention.
What are the symptoms of blurry vision?
Blurry vision can be linked to issues in different parts of the eye anatomy.
Cornea
The clear, dome‑shaped front surface of your eye that provides most of your eye's focusing power. When the cornea has an irregular shape, as with astigmatism, it can cause blurry vision by preventing light from focusing properly on the retina.
Lens
Located behind the iris, this flexible structure changes shape to help focus light at different distances. As we age, the lens becomes less flexible (presbyopia) and may develop cloudy areas (cataracts), both of which can cause blurred vision.
Retina
The light‑sensitive tissue at the back of your eye that converts light into electrical signals sent to your brain. Problems with the retina, such as macular degeneration or diabetic retinopathy, can cause various types of vision problems, including blurriness.
Pupil
The opening in the centre of the iris that controls how much light enters your eye. In certain lighting conditions or with some medications, pupil size changes can affect how clearly you see.
What causes blurry vision?
Blurry vision is common and can happen for many reasons. From refractive conditions that affect how your eyes bend light onto your retina, to health conditions like glaucoma, to environmental factors like screen time and sleep deprivation, the blurry vision causes are wide‑ranging.
Blurry vision is often a signal of harmless, yet inconvenient, conditions like presbyopia or astigmatism, which can be fixed with a simple eye test and some glasses or contact lenses.
However, it can sometimes be pointing towards a more serious health condition that's important to get checked out by a specialist.
Book an appointmentHow is blurry vision treated?
In the vast majority of cases, your blurry vision can be resolved with a few blinks of the eye. For blurred vision that just won’t shift, the treatment will depend very much on the cause. Common blurry visions include:
Corrective lenses: Updated glasses or contact lenses.
Eye drops: To relieve dryness, irritation, or allergies.
Medications: For infections, inflammation, or conditions like diabetes related eye changes.
Lifestyle changes: Staying hydrated, limiting screen time, and protecting your eyes from irritants.
Eye procedures or surgery: For more serious issues such as cataracts, glaucoma, or retinal problems.
If your vision doesn’t improve, it’s important to seek professional advice as soon as possible.
Book an eye testCan blurry vision be prevented?
Blurry vision isn’t always preventable, but good habits and regular eye care can go a long way in managing or delaying the causes. Wearing the right glasses or contact lenses, protecting your eyes from UV rays with sunglasses, and taking regular breaks from screens all help to reduce eye strain and protect your sight over time.
It also helps to keep conditions like diabetes and high blood pressure under control, and avoiding smoking can make a difference, too. Some causes of blurry vision are linked to age or family history, so it’s important to keep up with routine eye tests. That way, your optometrist can pick up on any changes early and help you stay on top of your eye health.
Blurry Vision FAQs:
Yes, if you're finding one eye blurry, it could be stress‑related. Anxiety and stress might lead to eye strain or trigger migraines, all of which can affect your vision. However, if you're experiencing sudden blurry vision, or it doesn’t go away after a period of time, it’s important to see an optometrist straight away, as it could be a sign of a more serious problem.
Hormonal changes during pregnancy can cause fluid retention, which may temporarily change the shape of your cornea and blur your vision. Other conditions linked to pregnancy, like gestational diabetes and pre‑eclampsia, can also affect your sight. That’s why it’s important to mention any vision changes to your doctor.
There are some things you can do to alleviate blurry vision naturally. These include:
Getting enough rest: You might experience blurry vision when your eyes are strained. Eye strain can be caused by tiredness and overexposure to digital screens. Making sure you get enough sleep and reducing screen time can have a positive effect on the clarity of your vision.
Eye lubrication: If your blurry vision is caused by dry eyes, using eye drops or a warm compress can help. If you live in a dry environment, a humidifier can add moisture to the air and help your eyes to lubricate themselves.
Eating a balanced diet: A varied, nutritious diet will keep your vision sharp and your eyes healthy. Make sure to include plenty of Vitamin A to support the retina, Omega‑3 fatty acids to reduce dry eyes and leafy greens, broccoli and eggs to protect the macula.
Protecting your eyes: Sun exposure and physical damage can impact your vision clarity. Make sure to wear sunglasses when outside to protect your eyes from harmful UV rays, and always wear protection when engaging in manual labour.
Blurred vision in the morning is quite common, often linked to dry eye syndrome, dehydration, or environmental factors like low humidity or sleeping with a fan on.
Sleeping on your front or wearing an eye mask can put pressure on your eyes and affect your sight. Overwearing your contact lenses can also cause dryness and irritation.
If your blurry vision comes on suddenly, it could be a sign of a medical emergency.
You should seek urgent medical attention if:
The blurry vision is sudden and in one eye
The blurred vision is accompanied by eye pain, severe headache or trouble with your speech
You are also seeing flashes of light or a sudden increase in floaters
You have diabetes or high blood pressure
Call your GP or book an urgent test with one of our optometrists if you experience any of these symptoms alongside sudden blurry vision.
Yes, eye allergies (allergic conjunctivitis) can cause blurry vision. Allergens like pollen, dust, or pet dander can make your eyes itchy, watery, and swollen, which might interfere with clear sight. Using antihistamine drops or avoiding triggers can help.
Blue light itself isn’t directly harmful to your eyes, but long hours on screens can cause digital eye strain, which may result in temporary blurry vision. Taking regular screen breaks and adjusting the brightness and tone of the light on your screen can alleviate strain on your eyes.
Related conditions
Not sure if this is what you're experiencing? Explore some related conditions:
Cloudy Vision
Often confused with blurry vision, cloudy vision is when objects appear ‘milky’ as if you’re looking through a cloudy piece of glass in one or both eyes.
Find out moreTunnel Vision
Tunnel vision is the worsening or loss of peripheral vision, the part of vision that lies beyond your direct line of sight, and can be temporary, or permanent.
Learn moreGlaucoma
Glaucoma is a group of diseases that damage the optic nerve. As most cases won't have any symptoms one of the best ways to detect it is a routine eye test.
Find out more
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National Eye Institute (2024) Cataracts. Retrieved from: Available at: https://www.nei.nih.gov/learn‑about‑eye‑health/eye‑conditions‑and‑diseases/cataracts
Mayo Clinic. (2024) Glaucoma ‑ Symptoms and causes. Retrieved from: Available at: https://www.mayoclinic.org/diseases‑conditions/glaucoma/symptoms‑causes/syc‑20372839
American Academy of Ophthalmology. (2024) Understanding Glaucoma: Symptoms, Causes, Diagnosis, Treatment. Retrieved from Available at: https://www.aao.org/eye‑health/diseases/what‑is‑glaucoma
Zhu, D., Karki, S., Dhariwal, M., Soini, E., & Asseburg, C. (2024) Patient‑Reported Outcomes of Visual Disturbances with a Trifocal Intraocular Lens: A Meta‑Analysis. Ophthalmology and Therapy, 14(2), 379–390. Retrieved from Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC11754775/
Cleveland Clinic. (2023) Why Are You Seeing Halos? Retrieved from: Available at: https://health.clevelandclinic.org/halo‑vision
BrightFocus Foundation. (2025) 3 Subtle Signs Your Glaucoma May Be Getting Worse. Retrieved from Available at: https://www.brightfocus.org/resource/3‑subtle‑signs‑your‑glaucoma‑may‑be‑getting‑worse/
Fitzgerald, A. (2025) Astigmatism lights: Appearance and more. Medical News Today. Retrieved from: Available at: https://www.medicalnewstoday.com/articles/astigmatism‑lights
