What’s Causing My Blurred Vision?

What are the symptoms of blurred vision?

 Blurred vision can affect your entire line of sight or just parts of your vision. This could include your peripheral vision, or how you see to the right or left of your field of vision. You can also experience blurred vision in only one eye.

Other ways to describe blurred vision include clouded or dim vision.

What are the causes of blurred vision?

There can be many causes of blurred vision. Examples of common causes are:
  • refractive errors, such as near-sightedness, far-sightedness, or astigmatism
  • abrasions to the cornea
  • age-related macular degeneration
  • cataracts
  • corneal opacification, or scarring
  • infectious retinitis
  • migraine
  • optic neuritis
  • retinopathy, such as diabetic retinopathy
  • stroke
  • trauma or injury to the eyes
People with diabetes can also experience blurred vision if their blood sugar levels fluctuate significantly.

How is blurred vision diagnosed?

Your doctor will diagnose the cause of your blurred vision by first taking an inventory of your symptoms. Examples of questions they may ask include:

When did you first start noticing the blurred vision?
What makes the blurred vision worse or better?

They may also ask about your personal medical history as well as a family history of eye conditions.

Eye tests

Your doctor may next want to perform a physical examination of your eyes. They may test your vision by asking you to read an eye chart. They might also perform other eye tests, such as:

ophthalmoscopy
refraction test
slit lamp examination
tonometry, which measures intraocular pressure

Blood tests

Your doctor might also perform blood testing. Blood tests may be used to help them determine whether bacteria are in the blood. They can also use tests to obtain your white blood cell count (WBC) if they suspect there could be an infection.

How is blurred vision prevented?

While it’s not always possible to prevent some causes of blurred vision, taking steps to care for your eyes can help prevent lifestyle-related causes.

Here are some tips for healthy vision:
  • Always wear sunglasses that provide broad-spectrum protection when you’re going out in the sun.
  • Eat a diet rich in eye-healthy nutrients. The antioxidant lutein can be found in dark, leafy green such as spinach and kale. Foods high in omega-3 fatty acids include albacore tuna, trout, and halibut. Get vitamin A from sources such as carrots, sweet potatoes, and liver.
  • Don’t smoke.
  • Undergo regular comprehensive eye exams, especially if someone in your family has a history of an eye disease.
  • Wash your hands before putting on or taking out contact lenses to reduce infection risk.
  • Wear protective eyewear when operating heavy machinery or engaging in activities such as painting and home repairs.

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