Ehlers-Danlos Syndrome and Binocular Vision Dysfunction (BVD)

Ehlers-Danlos syndrome (EDS) is a group of genetic connective tissue disorders characterized by collagen weakness, which affects the body’s structural support, including the eyes and visual system. Collagen is a key building block of many eye structures from the sclera and cornea to connective tissues around the muscles that control eye movement. When collagen is fragile, the visual system can become unstable. ​​​​​​

Binocular Vision Dysfunction (BVD) is increasingly recognized in individuals with Ehlers-Danlos syndrome. This overlap is clinically significant, as connective tissue fragility can directly impact the structures responsible for eye alignment and focusing, leading to visual discomfort and functional challenges.

Why EDS Can Affect Eye Alignment

EDS affects collagen, the structural protein that provides stability to:

• Extraocular muscles (the muscles that move the eyes)

• Ligaments and connective tissues supporting the eye

• The sclera (white of the eye)

• Blood vessels supplying the eye and brain

When these tissues are more elastic or unstable:

• The eyes may not align perfectly

• Small vertical or horizontal misalignments can develop

• The visual system works harder to maintain single, clear vision
  
  

That constant strain can trigger neurological stress responses.

Common Symptoms in EDS

People with EDS may experience:
Visual Symptoms

• Double or shadowed vision

• Blurred or unstable focus

• Difficulty reading (words drifting, skipping lines)

• Light sensitivity

• Trouble seeing at night or on screens

Physical & Neurological Symptoms

• Persistent headaches or migraines

• Eye strain and eye pain

• Dizziness or vertigo

• Poor depth perception

• Balance challenges

• Motion sickness

Emotional & Functional Effects

• Anxiety in busy environments

• Avoidance of driving or crowded places

• Tension and stress from prolonged visual tasks
  
  

Some EDS subtypes even involve scleral thinning, blue sclerae, or other structural fragility, which can increase the risk of retinal issues and make everyday vision more challenging.

How BVD Can Trigger Anxiety

The brain relies heavily on stable visual input to feel safe and oriented in space. When alignment is slightly off:

• The brain increases effort to fuse images

• The autonomic nervous system may activate

• The body can shift into “fight-or-flight”

This can lead to:

• Heart racing

• Shortness of breath

• Sense of unease

• Panic-like episodes
  
  

Over time, chronic visual strain may contribute to persistent anxiety.

In individuals with EDS who may already have dysautonomia (like POTS) the visual instability can amplify nervous system sensitivity.

Related Conditions Often Seen Together

• Postural Orthostatic Tachycardia Syndrome (POTS)

• Craniocervical instability

• Migraine

• Convergence insufficiency

• Vertical heterophoria
  
  

Diagnosing BVD in EDS

Standard eye exams often focus on acuity (how clearly you see letters on a chart), but subtle binocular imbalances require specialized testing, such as:

• Binocular vision assessments

• Prism testing

• Functional vision evaluations
  
  

Doctors trained in Binocular vision or neuro-optometry are best equipped to detect these alignment issues.

Treatment and Management Options

Prism Glasses
Specialized prism lenses help redirect light to compensate for misalignment, allowing the brain to fuse images more easily and reduce strain. Many patients report dramatic improvements with proper prism correction.

Lifestyle & Supportive Care

• Frequent breaks during visual tasks

• Improved lighting and contrast

• Postural or physical therapy to reduce neck tension

• Gentle eye exercises and stress-management (often helpful alongside prism and therapy)

Early detection and tailored treatment can improve quality of life and reduce unnecessary discomfort.

Important Note

Not all anxiety in EDS is vision-related. However, if anxiety:

• Worsens in visually complex environments

• Improves when one eye is covered

• Comes with headaches and dizziness

A binocular vision evaluation may be worth considering.

If you have POTS or EDS and still struggle with symptoms, a comprehensive neurovisual eye exam may help identify binocular vision dysfunction (BVD). At Focus On Eyes, we offer personalized care, addressing possible causes of all your symptoms. Start with our online BVD questionnaire.

A thorough evaluation could reveal the cause of persistent symptoms and help improve your quality of life.