What Is Fuchs’ Endothelial Dystrophy?

Morning haziness can be a symptom of Fuchs’ endothelial dystrophy, but other eye conditions can cause similar changes. It affects the inner layer of your cornea and can cause fluid to build up.

As your corneal cells become less effective, your vision may become blurred or cloudy. The condition usually develops slowly, so you may not notice symptoms at first.

What Does Your Corneal Endothelium Do?

Your corneal endothelium helps keep your cornea clear by continuously removing excess fluid. These cells work like tiny pumps to maintain the right balance of hydration.

As your endothelial function declines, fluid can build up in your cornea and cause swelling. This can make your cornea less clear and your vision appear misty or blurred.

What Happens to Your Cornea in Fuchs’ Dystrophy?

In the early stages, your corneal cells may still keep your cornea clear, so you may have few symptoms. As these cells become less effective, fluid can build up and cause your cornea to swell.

As the swelling increases, you may notice blurred vision, haze or glare. In advanced cases, corneal swelling can cause small blisters to form on the surface of your cornea, which may become painful if they rupture.

What Are the Early Symptoms of Fuchs’ Dystrophy?

You may have no noticeable symptoms in the early stages of Fuchs’ dystrophy. When symptoms develop, you may notice hazy or blurred vision when you wake up that gradually becomes clearer later in the day.

You may also notice more glare around bright lights or find night-time driving harder. These symptoms can have other causes, so you should have an eye examination rather than assuming they are caused by Fuchs’ dystrophy.

Clinical Tip

If you have Fuchs’ dystrophy and are considering cataract surgery, make sure your ophthalmologist knows about your corneal condition before the operation. Cataract surgery can place additional stress on the corneal endothelium, so your surgeon may need to assess your endothelial health and corneal thickness when planning treatment.

If your vision varies noticeably between morning and later in the day, mention this during your assessment rather than relying only on a single vision test. Diurnal changes in vision can provide useful information about how your cornea is functioning.

Why Can Your Vision Be Worse in the Morning?

Your vision may be hazier in the morning because your cornea can become more swollen while you sleep. When your endothelial cells are less effective, excess fluid can build up overnight.

As you wake and your eyes remain open, some fluid can evaporate and your vision may become clearer. As your Fuchs’ dystrophy progresses, however, your cornea may stay swollen for longer and your blurred vision may last throughout the day.

Does Fuchs’ Dystrophy Always Get Worse?

Your Fuchs’ dystrophy is generally progressive, but it can develop slowly and affect people differently. You may have the condition for years without significant changes to your vision.

Your ophthalmologist can monitor your cornea and symptoms to decide whether you need treatment. Having Fuchs’ dystrophy does not automatically mean that you will need surgery.

DMEK vs DSAEK for Fuchs’ Endothelial Dystrophy

Feature	DMEK	DSAEK
What is transplanted?	Donor Descemet’s membrane and endothelial cells.	Donor endothelial cells and Descemet’s membrane together with a thin layer of posterior corneal stroma.
Graft thickness	Thinner graft.	Thicker graft because a layer of donor stroma is included.
Visual recovery	Can provide rapid visual rehabilitation in suitable patients.	Can also provide good visual improvement, although recovery may differ between individuals.
Visual outcomes	A randomised trial found no statistically significant difference in average best-corrected visual acuity at 12 months, although more DMEK-treated eyes reached 20/25 vision.	Can provide good visual outcomes and remains an established endothelial keratoplasty technique.
Surgical complexity	Technically delicate because the donor tissue is extremely thin.	The donor graft is thicker and can be easier to handle in some surgical situations.
Potential complications	Graft detachment can occur and may require an additional air or gas procedure called rebubbling.	Graft detachment can also occur, and additional treatment may sometimes be required.
Which is suitable for you?	Your corneal surgeon will consider your eye health, corneal condition and surgical factors.	Your corneal surgeon will consider the same individual factors when deciding whether DSAEK is appropriate.

What Causes Fuchs’ Endothelial Dystrophy?

Fuchs’ dystrophy can have genetic and non-genetic contributors, and the condition may run in your family. However, it can also occur without a known family history.

Your condition is not caused by reading, eye strain or spending too much time on screens. If you know that someone in your family has Fuchs’ dystrophy, you should mention this during your eye examination.

At What Age Does Fuchs’ Dystrophy Usually Cause Symptoms?

Fuchs’ dystrophy can cause changes in your cornea before you notice any symptoms. The timing and severity of symptoms can vary, so your age alone does not show how advanced the condition is.

• Changes can begin early: Signs of Fuchs’ dystrophy may appear in your 30s or 40s, even when you have not noticed significant changes in your vision.
• Symptoms may become noticeable later: More noticeable vision problems are commonly seen from your 50s onwards, although the timing can vary between individuals.
• Age does not show disease severity: Being younger or older does not necessarily indicate how advanced your Fuchs’ dystrophy is or how much it is affecting your cornea.
• Watch for vision changes: Increasing morning blur, glare or difficulty with reading or driving should be discussed with your eye-care professional.

Fuchs’ dystrophy can therefore develop for some time before it noticeably affects your daily vision. If you notice changes in how clearly you see, an eye examination can help assess your corneal health and determine whether monitoring is needed.

Can Fuchs’ Dystrophy Cause Eye Pain?

Your Fuchs’ dystrophy is not usually painful in the early stages. You may mainly notice blurred or hazy vision rather than discomfort.

If your condition becomes more advanced, swelling can cause painful blisters on the surface of your cornea. New or significant eye pain should still be assessed rather than assumed to be caused by Fuchs’ dystrophy.

How Is Fuchs’ Endothelial Dystrophy Diagnosed?

Fuchs’ dystrophy may be found during a routine eye examination, even before you notice symptoms. Your ophthalmologist can use a slit-lamp examination to look for characteristic changes in your cornea.

Your specialist may also check your vision and assess whether your cornea is swollen or thicker than normal. If you have ongoing hazy vision, your ophthalmologist can discuss whether further assessment or monitoring is needed.

What Tests May Be Used to Assess Your Cornea?

Your specialist may check your vision and measure your corneal thickness with a test called pachymetry. This can help show whether your cornea is becoming swollen.

Your ophthalmologist may also use specialised imaging to assess your endothelial cells. You may not need every test at every visit, as your tests depend on your symptoms and examination findings.

Evidence Note

Fuchs’ endothelial dystrophy is diagnosed primarily through clinical examination, particularly slit-lamp assessment of characteristic corneal guttae, which are small bumps on the inner surface of the cornea, and signs of corneal swelling. Additional tests such as pachymetry, specular microscopy and corneal imaging can provide information about corneal thickness, endothelial cells and disease severity.

Research shows that there is no single test that determines the severity or need for treatment in every patient. Your ophthalmologist will consider your symptoms, visual function, corneal findings and other test results together when deciding whether monitoring, symptom-relieving treatment or surgery is appropriate.

Can Glasses Correct Vision Affected by Fuchs’ Dystrophy?

Your glasses can help correct prescription-related blur, but they cannot reduce corneal swelling or restore damaged endothelial cells. If Fuchs’ dystrophy affects your cornea, a new glasses prescription may not fully improve your vision.

Your ophthalmologist can assess whether your symptoms are due to your prescription, corneal changes, cataract or a combination of factors, and discuss suitable treatment options with you.

How Is Mild Fuchs’ Dystrophy Treated?

If your Fuchs’ dystrophy is mild, you may only need monitoring if you have no symptoms or vision problems. Treatment depends on how much the condition affects your daily life.

Your specialist may recommend hypertonic sodium chloride eye drops for symptom relief in some cases. Their benefit can vary, and they do not restore damaged endothelial cells or reverse the underlying condition.

When Might You Need Corneal Surgery?

Your specialist may consider corneal surgery if swelling from Fuchs’ dystrophy significantly affects your vision or comfort. The timing depends on your symptoms, corneal health and how your condition is affecting daily life.

Corneal endothelial surgery can replace the damaged endothelial layer and may help restore corneal clarity. Your ophthalmologist will discuss whether this option is suitable for you.

UK Guidance Note

NICE’s current HealthTech guidance on corneal endothelial transplantation identifies Fuchs’ dystrophy as a common cause of corneal endothelial dysfunction. The guidance states that corneal endothelial transplantation should be carried out with appropriate clinical governance and consent and by surgeons with specific training in the technique.

Specialist assessment is appropriate when Fuchs’ dystrophy becomes symptomatic or significantly affects your vision. If you develop sudden or significant changes in vision or severe eye pain, seek urgent eye assessment rather than changing your treatment yourself.

What Is DMEK Surgery?

DMEK surgery replaces the unhealthy Descemet’s membrane and endothelial layer of your cornea with healthy donor tissue. This may restore the cornea’s ability to remove excess fluid and may improve corneal clarity.

Your specialist will decide whether DMEK is suitable for you based on your corneal condition and overall eye health.

What Is the Difference Between DMEK and DSAEK?

DMEK and DSAEK are both surgeries that replace damaged endothelial tissue at the back of your cornea. The main difference is the type and thickness of donor tissue used.

Your corneal surgeon will consider your eye condition and explain which procedure may be more suitable for you, including the expected benefits and recovery.

Research Insight

A multicentre randomised controlled trial comparing DMEK with ultrathin DSAEK in people with Fuchs’ endothelial dystrophy found no statistically significant difference in average best-corrected visual acuity at 12 months. However, a greater proportion of eyes in the DMEK group reached 20/25 vision, while endothelial cell density did not differ significantly between the groups at 12 months.

These findings show why DMEK and DSAEK should not be presented as identical procedures or as a simple choice between a “better” and “worse” operation. The evidence suggests that visual outcomes can differ in some measures, while the most appropriate procedure depends on your corneal condition, eye health, surgeon expertise and individual circumstances.

How Does Fuchs’ Dystrophy Affect Cataract Surgery?

Your Fuchs’ dystrophy and cataracts can both affect your vision, so your ophthalmologist will assess how much each condition contributes to your symptoms.

Reduced endothelial cell reserve can increase the risk of corneal swelling after cataract surgery. Depending on your eye health, your surgeon may recommend cataract surgery alone or discuss a combined treatment approach.

Myth vs Fact

Myth	Fact
Fuchs’ dystrophy always causes symptoms.	Early Fuchs’ dystrophy may cause no noticeable symptoms and can sometimes be detected during a routine eye examination.
Morning blurred vision always means you have Fuchs’ dystrophy.	Morning haziness can occur with Fuchs’ dystrophy, but other eye conditions can also affect your vision. An eye examination is needed to identify the cause.
Fuchs’ dystrophy only affects one eye.	Fuchs’ dystrophy usually affects both eyes, although one eye may be more severely affected than the other.
Glasses can fully correct blurred vision caused by Fuchs’ dystrophy.	Glasses can correct a refractive error, but they cannot restore damaged endothelial cells or remove corneal swelling caused by Fuchs’ dystrophy.
Everyone with Fuchs’ dystrophy needs surgery.	Many people with mild disease can be managed without surgery. Corneal surgery is generally considered when the condition significantly affects vision or comfort.
DMEK and DSAEK are exactly the same operation.	Both replace unhealthy endothelial tissue, but DMEK uses a much thinner donor tissue layer, while DSAEK includes a layer of donor posterior stroma.
Fuchs’ dystrophy means you will become blind.	Fuchs’ dystrophy can cause severe visual loss in advanced disease, but the effect on vision varies considerably between patients and appropriate treatment can help manage corneal dysfunction.
Fuchs’ dystrophy is caused by using screens or reading too much.	Fuchs’ dystrophy is a corneal endothelial disorder with important genetic contributions. Screen use and reading are not established causes of the condition.
A normal vision test means your Fuchs’ dystrophy is not progressing.	Visual acuity is only one part of assessment. Your ophthalmologist may also consider corneal thickness, oedema, guttae and other structural findings.
Cataract surgery is always straightforward if you have Fuchs’ dystrophy.	Fuchs’ dystrophy can increase the risk of corneal swelling after cataract surgery, so your corneal health should be assessed when planning the operation.
Pain is expected with all Fuchs’ dystrophy.	Early disease is usually not painful. Significant pain can occur when advanced corneal swelling causes epithelial bullae or when a bulla ruptures, but new eye pain should still be assessed.
If your vision suddenly worsens, you can wait for your next routine appointment.	Sudden or significant visual deterioration should be assessed urgently because it may have another cause requiring urgent treatment.

Key Takeaways

• Fuchs’ endothelial dystrophy affects the inner layer of cells that helps keep your cornea clear.
• The condition usually affects both eyes and generally progresses slowly.
• Early disease may cause no symptoms, while morning haziness, blurred vision and glare can develop as corneal swelling increases.
• Advanced disease can cause persistent visual impairment and painful corneal blisters.
• Your ophthalmologist can assess the condition using slit-lamp examination and, when appropriate, tests such as pachymetry, specular microscopy and corneal imaging.
• Glasses can correct prescription-related blur but cannot replace damaged endothelial cells or remove the underlying corneal swelling.
• Mild disease may be managed with monitoring and symptom-relieving treatment, while more advanced disease may require endothelial keratoplasty.
• DMEK and DSAEK both replace diseased endothelial tissue, but they use different types and thicknesses of donor tissue.
• Fuchs’ dystrophy can increase the risk of corneal swelling after cataract surgery, so your corneal health should be considered when planning cataract treatment.
• Advanced Fuchs’ dystrophy can cause severe visual loss, so significant changes in vision should be assessed rather than ignored.
• If you develop sudden or significant vision changes or severe eye pain, seek urgent eye assessment.

Frequently Asked Questions

1. What is Fuchs’ endothelial dystrophy?
   Fuchs’ endothelial dystrophy is an eye condition that affects the inner layer of your cornea. The endothelial cells gradually become less effective at removing fluid, causing your cornea to swell and your vision to become blurred or cloudy.
2. What are the early signs of Fuchs’ dystrophy?
   You may notice hazy or blurred vision when you wake up, which may improve as the day goes on. You may also experience glare around lights, difficulty with night driving or gradually worsening vision.
3. Why is my vision worse in the morning with Fuchs’ dystrophy?
   Your vision may be worse in the morning because fluid can build up in your cornea while you sleep. As your eyes remain open during the day, some fluid may evaporate and your vision may become clearer.
4. Can Fuchs’ dystrophy cause blindness?
   Fuchs’ dystrophy can cause significant visual impairment when corneal swelling becomes advanced. The effect on vision varies between patients, and appropriate management can help address corneal dysfunction.
5. How is Fuchs’ endothelial dystrophy diagnosed?
   Your ophthalmologist can diagnose Fuchs’ dystrophy through an eye examination, including a slit-lamp assessment of your cornea. Your specialist may also use tests such as corneal thickness measurement and endothelial cell imaging.
6. Can glasses improve vision caused by Fuchs’ dystrophy?
   Glasses can correct blur caused by a change in your prescription, but they cannot remove corneal swelling or replace damaged endothelial cells. If Fuchs’ dystrophy is affecting your cornea, glasses may not fully restore clear vision.
7. Does everyone with Fuchs’ dystrophy need surgery?
   No. Many people with mild Fuchs’ dystrophy only need regular monitoring and symptom management. Corneal surgery is usually considered when swelling significantly affects your vision or daily activities.
8. What is DMEK surgery for Fuchs’ dystrophy?
   DMEK surgery replaces the damaged Descemet’s membrane and endothelial layer of your cornea with healthy donor tissue. This may help restore the cornea’s ability to remove excess fluid and improve vision affected by swelling.
9. Can Fuchs’ dystrophy affect cataract surgery?
   Yes. Fuchs’ dystrophy can increase the risk of corneal swelling after cataract surgery because your endothelial cells may already be weakened. Your ophthalmologist will assess your corneal health and discuss the most suitable approach for you.
10. Can Fuchs’ dystrophy be prevented?
    There is no established way to prevent Fuchs’ dystrophy. However, regular eye examinations can help detect changes early and allow your ophthalmologist to monitor and manage the condition appropriately.

Final Thoughts: Fuchs’ Endothelial Dystrophy

Fuchs’ endothelial dystrophy can develop gradually, and you may not notice symptoms until changes in your cornea begin to affect your vision. If you experience morning haziness, blurred vision, glare or increasing difficulty with daily activities, an eye examination can help identify the cause and guide suitable management.

If you have concerns about your eyesight or corneal health, you can contact the Eye Clinic London team to arrange an ophthalmology assessment.

References:

1. Vedana, G., Villarreal Jr, G. and Jun, A.S. (2016) ‘Fuchs endothelial corneal dystrophy: current perspectives’, Clinical Ophthalmology, 10, pp. 321–330. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC4762439/
2. Ali, M., Cho, K. and Srikumaran, D. (2023) ‘Fuchs Dystrophy and Cataract: Diagnosis, Evaluation and Treatment’, Ophthalmology and Therapy, 12(2), pp. 691–704. Available at: https://pmc.ncbi.nlm.nih.gov/articles/PMC10011243/
3. Oie, Y., Yamaguchi, T., Nishida, N., Okumura, N., Maeno, S., Kawasaki, R., Jhanji, V., Shimazaki, J. and Nishida, K. (2023) ‘Systematic Review of the Diagnostic Criteria and Severity Classification for Fuchs Endothelial Corneal Dystrophy’, Cornea, 42(12), pp. 1590–1600. Available at: https://pubmed.ncbi.nlm.nih.gov/37603692/
4. Dunker, S.L., Dickman, M.M., Wisse, R.P.L., Nobacht, S., Wijdh, R.H.J., Bartels, M.C., Tang, M.L., van den Biggelaar, F.J.H.M., Kruit, P.J. and Nuijts, R.M.M.A. (2020) ‘Descemet Membrane Endothelial Keratoplasty versus Ultrathin Descemet Stripping Automated Endothelial Keratoplasty: A Multicenter Randomized Controlled Clinical Trial’, Ophthalmology, 127(9), pp. 1152–1159. Available at: https://pubmed.ncbi.nlm.nih.gov/32386811/
5. Viberg, A., Samolov, B. and Byström, B. (2023) ‘Descemet Stripping Automated Endothelial Keratoplasty versus Descemet Membrane Endothelial Keratoplasty for Fuchs Endothelial Corneal Dystrophy: A National Registry-Based Comparison’, Ophthalmology, 130(12), pp. 1248–1257. Available at: https://www.sciencedirect.com/science/article/pii/S0161642023005328