Dry eyes are more than just an inconvenience—they can lead to significant discomfort and even visual disturbances like blurred vision. You’re not alone if you’ve ever struggled with dry, irritated eyes that make your sight feel hazy or unfocused, even with glasses or contact lenses.
Blurred vision often occurs because dry eyes disrupt the tear film your eyes need to maintain a clean, clear surface.
What Causes Dry Eyes?
Dry eye develops when your eyes don’t produce enough tears or lack the proper balance for lubrication and health. Tears are essential for maintaining a moist, comfortable, and nourished eye surface, which is crucial for clear vision.
Dry eye is often caused by multiple factors. However, common causes include meibomian gland dysfunction, blepharitis, environmental conditions, certain medications, and specific lifestyle factors.
Meibomian Gland Dysfunction (MGD)
The meibomian glands in your eyelids produce the oil layer of your tear film. When these glands are blocked or not functioning properly, your tears lack the oil that helps moisture last longer and spread evenly across the eye. As a result, your tears evaporate too quickly, leading to dryness.
Blepharitis
Blepharitis is an inflammation of the eyelids, often caused by bacteria or skin conditions. The eyelids become red and irritated, with dandruff-like scales forming on the eyelashes, blocking the oil glands and reducing the quality of your tears.
Environmental Factors
Several environmental factors can worsen dry eye symptoms. Windy days, low humidity, smoky conditions, and even air conditioning can increase tear evaporation, making your eyes feel drier.
Lifestyle & Medical Conditions
Long hours of staring at a screen, wearing contact lenses, or experiencing side effects from medications like antihistamines and antidepressants can all worsen dryness.
Additionally, hormonal changes and certain conditions, including diabetes and rheumatoid arthritis, may contribute to tear dysfunction.
What Causes Blurry Vision?
Blurred vision can result from various issues. However, when it comes to dry eye, the explanation usually relates to how tears impact your ability to see clearly.
When your eyes are adequately moisturized, the tear film creates a smooth surface over the cornea, allowing light to refract correctly into your eye.
When the tear film is disrupted or unstable, your cornea becomes uneven, scattering light instead of properly focusing, resulting in blurry or distorted vision.
Other causes of blurred vision unrelated to dry eyes may include:
Refractive errors like myopia, hyperopia, astigmatism, & presbyopia
Digital eye strain due to prolonged screen time
Cataracts that cloud the natural lens of your eye
Eye diseases like macular degeneration or diabetic retinopathy
Eye allergies or infections like conjunctivitis (pink eye)
However, when dryness and blurriness occur simultaneously, your tear film instability is likely to be the cause.
How Dry Eyes & Blurry Vision Are Linked
When you have dry eyes, blurry vision can occur due to a combination of factors.
Tear Film Instability
Your tear film is made up of 3 main layers:
Oil layer to prevent evaporation
Water layer for hydration
Mucus layer so tears stick to the surface
All 3 layers are essential for maintaining a healthy balance. When any part of the tear film is insufficient or imbalanced, it can disrupt the corneal surface, leading to blurred vision.
Inflammation
Inflammation of the eye’s surface or tear-producing glands can alter how tears are produced and distributed, affecting lubrication and visual clarity.
A Potential Cycle
Dry eye can lead to behaviors like rubbing your eyes or overusing artificial tears, which further exacerbates irritation and the deterioration of the tear film, creating a cycle that worsens both conditions.
