Blurred Vision: Causes, Symptoms & Treatment

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Experiencing blurred vision can be unsettling, particularly when you’re not sure what’s causing it. Sometimes there’s a straightforward reason, like tired eyes or a prescription that needs updating. But a new or sudden change in your vision can sometimes need more urgent attention.

Whether your vision has become blurry gradually, you’re noticing it in one eye, or life just doesn’t look as clear as it used to, understanding what’s happening is the best first step.

An eye test allows an optometrist to check your vision, assess your overall eye health and talk through any changes you’ve noticed.

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What is blurred vision?

Blurred vision is when things look less clear or focused than they normally do. You might notice that words look fuzzy when you’re reading, faces are harder to make out or objects in the distance don't look as sharp as they did before.

Blurred vision can affect one eye or both, and it can happen gradually or quite suddenly.

There are many possible causes behind blurry vision. Some are linked to the way your eyes focus, while others can be linked back to the surface of the eye, the lens, retina or your wider health.

The important thing is not to assume you know what's causing a change in your vision. If blurred vision is new, persistent or worrying you, an eye test can help you understand what’s happening.

How does clear vision work?

To understand why your vision can become blurred, it helps to start by knowing how your eyes create a clear image in the first place.

Here’s how clear vision comes together, broken down into 4 simple steps:

1. Cornea: Light first passes through the clear front surface of your eye, known as the cornea.

2. Lens: The lens helps to focus the light as it travels through the eye.

3. Retina: The lens focuses light on the retina at the back of your eye, which sends signals to your brain.

4. Brain: Your brain processes signals from your retina, and turns them into the images you see from moment to moment.

If something goes wrong at any stage of this process, your vision can become blurred or distorted. This is why blurry vision can have a number of causes – whether that’s how your eye focuses light, changes to the lens, irritation on the surface of the eye or an issue affecting the retina.

What does blurred vision look and feel like?

Blurred vision doesn't feel exactly the same for everyone, but there are still some common symptoms to look out for.

For example, you might notice:

- Objects looking hazy or out of focus

- Words becoming harder to read

- Difficulty seeing clearly at certain distances

- Faces or fine details looking less sharp

- Vision that seems to come and go

- One eye seeming clearer than the other

- Needing to squint to see more clearly

- Tired or strained eyes after concentrating

- Headaches after reading or using screens

You might also notice that your vision seems blurrier at certain times of day, such as when you first wake up.

How your symptoms behave can give your optometrist useful information about what may be causing them, so it’s important to observe them in as much detail as you can.

What causes blurred vision?

There are many possible blurred vision causes, ranging from changes to your prescription to deeper conditions that might be affecting your eye health.

Here are some of the most common causes we see:

Refractive errors

Refractive errors are common focusing problems that happen when light doesn’t focus accurately on the retina, causing things to look blurred or out of focus.

Short-sightedness, long-sightedness and astigmatism are all types of refractive error. Depending on the type, you may notice that things look blurred at a particular distance, or that your eyes become tired when trying to focus.

If your prescription has changed without you knowing, updating your glasses or contact lenses may be enough to make your vision clearer.

Dry eyes

The tear film that covers the surface of your eye helps keep your vision clear. When your eyes become dry, your vision can become blurry or fluctuate.

Dry eyes can be linked to things such as prolonged screen use, wearing contact lenses, air conditioning, heating or dry and windy environments.

If dry eyes are causing your vision to blur, you might also notice burning, grittiness, watering or a feeling that there's something in your eye.

Eye strain and tired eyes

Long periods of reading, screen use or close-up work can leave your eyes feeling tired. You might experience temporary blurred vision alongside headaches, aching eyes or difficulty concentrating.

Taking regular breaks and giving your eyes a chance to rest can help, but ongoing eye strain symptoms are worth discussing with an optometrist.

Natural changes with age

As you get older, the lens inside your eye becomes less flexible. This can make it harder to focus on things up close and is known as presbyopia.

Other age-related changes, including cataracts and some conditions affecting the retina, can also cause blurred or changing vision.

Other eye conditions

Blurred vision can sometimes be a symptom of another eye condition, including:

- Cataracts

- Glaucoma

- Diabetic eye disease

- Age-related macular degeneration

- Certain conditions affecting the cornea

- Eye inflammation or infection

This doesn't necessarily mean that blurred vision is a sign of a serious eye condition. There are many straightforward causes, but if your vision has changed and you don't know why, it's worth having it checked.

Blurred vision in one eye

Having blurry vision in just one eye can have several possible causes.

It could be something relatively straightforward, like a difference in prescription between your eyes, dry eye or irritation. But blurred vision in one eye can also be linked to conditions affecting the cornea, lens, retina or other parts of the eye.

What about sudden blurry vision in one eye?

Like any quick change to your sight, sudden blurry vision in one eye should be taken seriously, particularly if it's accompanied by other symptoms.

Seek urgent medical advice if you suddenly notice blurred vision, especially if you also have:

- Flashes of light or a sudden increase in floaters

- A dark curtain or shadow across your vision

- Eye pain or a very red eye

- Significant sensitivity to light

- A sudden loss or reduction in vision

Sudden changes can sometimes be linked to problems affecting the retina or other parts of the eye and may need prompt assessment.

If you suddenly lose vision, have severe eye pain, or have blurred vision alongside symptoms like facial weakness, arm weakness or difficulty speaking, call 999. These can be signs of a medical emergency.

When is blurred vision an emergency?

Most causes of blurred vision aren't emergencies, but some changes need urgent attention. Knowing the right thing to do based on your symptoms can be tricky, so here’s a quick guide to help you take the best course of action:

If you experience…

Sudden loss or major reduction in vision

Sudden blurred vision with flashes, new floaters or a dark shadow

Blurred vision with severe eye pain

Blurred vision with a red, painful eye or strong sensitivity to light

Blurred vision with facial weakness, arm weakness or speech problems

A sudden, severe headache alongside visual changes

What to do

Seek immediate medical help

Seek urgent eye assessment or NHS 111 advice

Seek urgent medical help

Seek urgent medical advice

Call 999

Seek emergency medical help

Blurred vision and other symptoms

Sometimes blurred vision appears alongside other symptoms. The combination can give your optometrist useful clues, but an in-person eye test is still needed to fully understand what’s causing your symptoms.

Blurred vision and headaches

Headaches and ocular migraines can happen when your eyes are working harder to focus, particularly during reading or prolonged screen use. An outdated prescription, long-sightedness or other focusing problems can contribute to this.

If your blurred vision and headaches are new, persistent or becoming more frequent, an eye test can help check whether your eyes could be contributing.

If you’re experiencing an unusually severe headache alongside sudden vision changes, weakness, confusion or problems speaking, call 999.

Blurred vision and dizziness

Feeling dizzy alongside blurred vision can happen for different reasons. Changes in your vision, migraines and some wider health conditions can all cause combinations of visual and balance symptoms.

If you're experiencing new or persistent blurred vision and dizziness, it's sensible to seek medical advice rather than assuming the symptoms are solely related to your eyes.

If your dizziness and blurred vision is sudden and accompanied by weakness, difficulty speaking or other possible stroke symptoms, call 999.

Sudden light sensitivity and blurred vision

Feeling sensitive to light, particularly when it develops suddenly alongside blurred vision, can sometimes indicate irritation or inflammation of the eye.

If your eye is also painful or very red, seek urgent medical advice.

Why is my vision blurry in the morning?

Blurry vision in the morning is often temporary and can be linked to dry eyes, changes in your tear film or irritation while you've been sleeping.

You may notice that your vision becomes clearer after blinking or once you've been awake for a while.

Wearing contact lenses can also contribute to dryness and irritation, particularly if lenses haven't been worn or cared for as recommended.

If your vision stays blurry for long periods after waking up, or is affecting one eye more than the other, it's worth having your eyes checked rather than assuming it's simply part of your morning routine.

How is blurred vision diagnosed?

The first step to an accurate blurry vision diagnosis is understanding how your vision has changed and when you first noticed it.

During an eye test, your optometrist may ask about:

- Whether the blur affects one or both eyes

- Whether it came on suddenly or gradually

- When your vision tends to be most affected

- Any headaches, pain, light sensitivity or other symptoms

- Your current glasses or contact lens prescription

- Your general health and any relevant medication

They'll then assess your vision and examine your eyes. Depending on what they find, this may include checking your prescription, looking at the health of the front and back of your eyes, measuring eye pressure or carrying out more advanced scans.

If something needs more specialist investigation, your optometrist can explain what happens next.

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How is blurred vision treated?

There's no single treatment path for blurred vision, because the right approach depends on what's causing it. However, some of the most common treatment options include:

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Treatment for dry eyes

If dry eyes are contributing to your blurred vision, your optometrist can help you understand what may be causing the dryness and what steps could help.

This might include changes to your screen habits, contact lens use or the environment around you.

Treatment for a related eye condition

If an eye condition is responsible for your blurred vision, treatment will depend on what that condition is.

For example, cataracts may eventually require surgery, while other eye conditions can be managed with medication, regular monitoring or other treatments.

The important thing is to find the cause first rather than trying to treat the blur on its own.

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Can blurred vision be prevented?

Not every cause of blurred vision can be prevented. Changes linked to ageing, your prescription or certain eye conditions aren't always in your control.

However, there are some simple ways to support your general eye health and reduce some common causes of visual discomfort:

- Go for regular eye tests

- Take breaks during prolonged screen use

- Wear your prescribed glasses or contact lenses as advised

- Follow good contact lens hygiene

- Protect your eyes from UV exposure

- Give your eyes time to rest after long periods of close-up work

- Look after any wider health conditions that can affect your eyes

If your vision has changed quickly, don't rely on lifestyle changes alone. A routine eye test can help you understand what’s behind certain changes in your sight.

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When should you see an optometrist for blurry vision?

You don't need to wait until blurred vision is affecting every part of your day before getting it checked.

It's worth arranging an eye test if:

- Your vision has become gradually less clear

- You’re struggling to read or see screens comfortably

- Your glasses no longer seem to give you the same clarity

- You’re getting frequent headaches or tired eyes

- One eye seems noticeably different from the other

- Your vision keeps becoming blurry and you don't know why

A Bayfields eye test gives you time to talk through what's changed, have your vision assessed and ask questions about your eye health.

Our 45-minute appointments give you more time to understand what's happening, while advanced eye technology such as OCT and optomap® retinal scans provide additional information about your eye health.

If you experience blurry vision that has started suddenly this could be more concerning and please contact us straight away to get more specific advice

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Blurred vision FAQs

What causes blurred vision?

Blurred vision can have many causes. Common examples include changes to your glasses prescription, short-sightedness, long-sightedness, astigmatism, dry eyes, eye strain and age-related changes such as presbyopia.

It can also be linked to conditions such as cataracts, glaucoma, diabetic eye disease or problems affecting the retina.

If you don't know what's causing your blurred vision, an eye test can help establish what may be happening.

Can dry eyes cause blurred vision?

Yes. Dry eyes can make your vision temporarily blurry or cause it to fluctuate. You may also notice burning, grittiness, redness or watery eyes.

If dry eye symptoms keep coming back, an optometrist can help identify possible causes and discuss ways to make your eyes more comfortable.

Can cataracts cause blurred vision?

Yes. Cataracts can make vision gradually become blurred or cloudy as the natural lens inside the eye becomes less clear.

If you've noticed a gradual change in your vision, an eye test can help identify whether cataracts could be contributing.

How long does vision stay blurry after cataract surgery?

Blurred vision can occur while your eyes recover after cataract surgery, but how long it lasts varies from person to person.

If you've recently had cataract surgery and your vision becomes suddenly worse, or you develop pain, redness, flashes, new floaters or a dark shadow across your vision, seek urgent medical advice.

What causes blurry vision in one eye?

Blurry vision in one eye can have several causes, including differences in prescription, dry eye, irritation or conditions affecting the cornea, lens or retina.

If the change is sudden, particularly if it's accompanied by pain, flashes, new floaters, a shadow or significant loss of vision, seek urgent medical advice.

Why is my vision blurry when I wake up?

Morning blurred vision can sometimes be linked to dry eyes or changes to the tear film while you're sleeping. It may become clearer after blinking and being awake for a while.

If it keeps happening, doesn't clear or affects one eye more than the other, it's worth arranging an eye test.

Can stress cause blurred vision?

Stress can contribute to symptoms such as eye strain and headaches, which may make your vision feel less comfortable. But blurred vision has many possible causes, so it's important not to assume stress is responsible for a new or persistent change.

If you're concerned about your vision, an eye test can help rule out other causes.

Can a scratch on the eye cause blurred vision?

Yes. An injury or scratch affecting the surface of the eye can cause blurred vision, discomfort, watering or sensitivity to light.

If you've injured your eye and your vision has changed, particularly if the injury involved a sharp object, chemical or high-speed impact, seek urgent medical attention.

Can conjunctivitis cause blurred vision?

Conjunctivitis can cause temporary blurring, particularly when discharge or watering affects the surface of the eye.

If your vision itself has become significantly blurred, or you have pain, strong light sensitivity or other changes to your sight, you should seek medical advice rather than assuming it's simply conjunctivitis.

When should I see an optometrist about blurred vision?

If your vision has gradually become less clear, keeps becoming blurry or is affecting everyday activities such as reading, working or driving, an eye test can help identify what's causing it.

If the change is sudden or comes with significant vision loss, severe pain, flashes, new floaters or a dark shadow across your vision, seek urgent medical advice instead.

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More ways to support your vision

Find glasses that suit your lifestyle

If your blurred vision is linked to your prescription, the right glasses can make everyday tasks feel clearer and more comfortable.

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Explore contact lenses

Contact lenses can provide an alternative to glasses for some people. If you're considering contact lenses, your optometrist can help you understand what's suitable for your eyes and lifestyle.

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Understand varifocal and multifocal contact lenses

If you’re finding it harder to see clearly at different distances as your vision changes with age, varifocal or multifocal contact lenses may be an option.

Learn about varifocal and multifocal lenses

Try our online eye test

If you’ve noticed a change in your vision, our online eye test can give you a useful indication of your eyesight from home. It’s a convenient starting point, but it doesn’t replace a full eye test with an optometrist.

Try our online eye test

Find support for blurred vision near you

If your vision has changed and you’re not sure why, an eye test can help you get a clearer picture of what’s happening.

At Bayfields, you’ll have time to talk through your symptoms, have your vision and eye health assessed, and understand what your results mean. Whether you need a new prescription, further advice or simply some reassurance, we’ll explain your options clearly and help you decide what to do next.

Our 45-minute eye appointments, alongside advanced technology such as OCT and optomap® scans at selected practices, give you the time and information you need to feel more confident about your eye health.

At your local Bayfields practice, you can expect:

- A thorough eye test tailored to your needs

- Time to discuss changes or concerns about your vision

- Advice on glasses, contact lenses and other vision correction options

- Advanced eye health imaging at selected practices

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