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10 Common Causes of Blurry Vision

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10 Common Causes of Blurry Vision

A group of blurred business people walking through a building

Blurry vision can be caused by all sorts of factors, from digital eye strain to eye conditions such as myopia. Although people experiencing blurry vision may struggle to see clearly or manage their usual tasks, most cases are due to refractive error.

10 common causes of blurry vision include:

  1. Refractive errors (myopia, hyperopia, astigmatism)
  2. Eye strain
  3. High blood sugar
  4. Eye trauma or injury
  5. Migraines
  6. Detached retina
  7. Age-related macular degeneration
  8. Concussion
  9. Eye infection
  10. Optic nerve inflammation

If you are concerned about blurry vision, get your eyes examined by your eye doctor as soon as possible. 

What is Blurry Vision?

Blurred vision is an overall lack of sharpness resulting in the inability to see fine detail. It varies depending on the individual and the cause. Blurry vision can affect:

  • Your entire line of sight or just parts of your vision
  • Your peripheral vision
  • Vision in one or both eyes 

Other Symptoms that may Accompany Blurred Vision

Along with blurred vision, you may experience other eye symptoms that can range from mild to serious, such as:

  • Pain
  • Redness
  • Double vision
  • Eye discharge
  • Headache 
  • Nausea
  • Itchiness

Top Causes of Blurry Vision

Refractive Errors

Refractive errors include conditions such as near-sightedness, far-sightedness, or astigmatism. If your blurry vision persists, consult a doctor and receive an eye exam to find a treatment that is suitable for you. 

Eye Strain

Digital eye strain can cause your eyes to become tired or sore after spending too long looking at a digital device. To avoid digital eye strain and blurry vision that can be a result, you should follow the 20/20/20 rule.

High Blood Sugar 

Blurry vision can be a sign that your body is having a hard time regulating its blood sugar levels. If your blood sugar levels are too high for a prolonged period, it can lead to more serious eye and health problems. If you are concerned about your blood sugar levels, book a diabetic eye exam as soon as possible. 

Trauma or Injury to the Eye 

Eye injuries that can cause blurry vision include bruises, punctures and scratches. They can result from accidents, exposure to chemicals, or foreign objects in the eye.

If you have an eye injury it is important to see your eye doctor right away as eye injuries can cause serious eye damage and vision loss.


Migraine attacks are a neurological condition characterized by intense headaches. They are often accompanied by nausea, sensitivity to light and blurry vision. Migraines are usually treated through medication and lifestyle changes, but it is best to consult a doctor if you are experiencing symptoms. 

Detached Retina

A detached retina is a serious eye condition where the retina pulls away from the vital blood vessels it needs to perform. If you are experiencing any of these symptoms seek medical attention immediately as rapid reattachment is needed to avoid permanent vision loss:

  • Gray or black specks floating in your vision
  • A “shadow” on the sides or middle of your field of vision
  • Flashes of light that can occur in one or both eyes

Age-related macular degeneration

Age-related macular degeneration (AMD) is a disease that can affect the retina, which can cause blurred vision. According to the National Eye Institute, AMD is more common in older adults, and it can occur in one or both eyes.

A young girl who is concussed from playing soccer seeking help at a doctors office


A concussion occurs when a person experiences an injury to the head. Along with blurred vision, symptoms of a concussion can include:

  • Changes in mood
  • Confusion
  • Amnesia
  • Headache
  • Dizziness
  • Drowsiness

Eye infections

The following eye infections may cause blurred vision:

  • Keratitis– the inflammation or infection of the cornea 
  • Orbital cellulitis– another bacterial or fungal infection that can affect the eyelids and the eyeball 
  • Uveitis– the inflammation of the uvea, the middle part of the eye, which also contains the iris

Optic Nerve Inflammation

Also known as optic neuritis, optic nerve inflammation causes distorted or blurry vision. Optic neuritis usually heals on its own but if you are suffering from a severe case, your doctor may prescribe steroids to speed up the process. 

What to do if You have Blurry Vision

If you have blurry vision, most cases are due to an uncorrected refractive error. However, if the sudden and persistent blurred vision occurs it could be serious. You should discuss this issue with your ophthalmologist or optometrist as soon as possible, even if the effects have passed.

When to See a Doctor 

If you have any of the following symptoms it could mean you have a serious eye condition, which may cause permanent eye damage and vision loss. You may need emergency eye care or medical attention if you are experiencing any of the following:

  • Severe eye pain
  • Eye injury
  • Signs of a stroke such as a facial droop, one-sided weakness, or difficulty speaking
  • Significantly reduced vision, especially in only one eye
  • Loss of one area of your vision

Visit Us at Calgary Family Eye Doctors

If you’re noticing any of the signs above, don’t hesitate to contact us at Calgary Family Eye Doctors. We’re here to help you maintain and preserve your ocular health.

Written by
Dr. Brent Hopfauf

Dr. Hopfauf is a born-and-raised Calgarian and one of the proud owners of Calgary Family Eye Doctors. After earning his Bachelor of Science degree with distinction from the University of Calgary, he headed to Ontario for the Optometry Program at the University of Waterloo. Upon graduation, Dr. Hopfauf was named Class Valedictorian. He has had the unique opportunity to further his training in ocular diseases in Houston, Texas and has studied specific conditions that include glaucoma, cataracts, dry eyes, and uveitis.

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Dr. Brent Hopfauf

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