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Common Causes of Dry Eye Disease Dry Eye Disease (DED) is a multifactorial condition characterized by tear film instability, ocular surface inflammation, and symptoms of discomfort, fluctuating vision, and irritation. Understanding the underlying causes is essential for effective management and long-term ocular health. 1. Lifestyle Factors • Prolonged screen use reduces blink rate and increases tear evaporation.  • Extended near work can contribute to ocular fatigue and dry eye symptoms.  • Contact lens wear may disrupt the natural tear film.  • Certain eye cosmetics can block meibomian glands and affect tear quality. 2. Environmental Factors • Air conditioning and heating systems accelerate tear evaporation.  • Dry, windy, or smoky environments can irritate the ocular surface.  • Excessive ultraviolet (UV) exposure may contribute to ocular surface stress.  • Low humidity environments often worsen dry eye symptoms. 3. Medication-Related Causes • Antihistamines may reduce tear production.  • Antidepressants can contribute to ocular dryness.  • Certain antihypertensive medications are associated with dry eye symptoms.  • Some systemic medications may affect tear secretion and tear film stability. 4. Systemic and Ocular Diseases • Sjögren syndrome and other autoimmune diseases can significantly reduce tear production.  • Diabetes mellitus may affect corneal nerves and tear function.  • Thyroid eye disease can alter blink mechanics and ocular surface health.  • Blepharitis and meibomian gland dysfunction are common contributors to evaporative dry eye. 5. Demodex and Eyelid Disorders • Demodex infestation may contribute to chronic eyelid inflammation.  • Meibomian gland dysfunction (MGD) is one of the leading causes of evaporative dry eye.  • Chronic blepharitis can destabilize the tear film and worsen symptoms. Key Clinical Concept: Tear Film Instability • The central mechanism in many dry eye cases is tear film instability.  • An unstable tear film breaks up prematurely, exposing the ocular surface.  • This can lead to irritation, inflammation, blurred vision, and ocular discomfort. Common Symptoms • Burning or stinging sensation  • Foreign body sensation  • Eye redness  • Excessive tearing (reflex tearing)  • Fluctuating or blurred vision  • Light sensitivity  • Eye fatigue Management Strategies • Use preservative-free artificial tears when appropriate.  • Follow the 20-20-20 rule during screen use.  • Maintain adequate hydration.  • Treat underlying eyelid disease and meibomian gland dysfunction.  • Optimize environmental humidity and reduce exposure to irritants.  • Seek professional evaluation for persistent symptoms.
Common Causes of Dry Eye Disease Dry Eye Disease (DED) is a multifactorial condition characterized by tear film instability, ocular surface inflammation, and symptoms of discomfort, fluctuating vision, and irritation. Understanding the underlying causes is essential for effective management and long-term ocular health. 1. Lifestyle Factors • Prolonged screen use reduces blink rate and increases tear evaporation. • Extended near work can contribute to ocular fatigue and dry eye symptoms. • Contact lens wear may disrupt the natural tear film. • Certain eye cosmetics can block meibomian glands and affect tear quality. 2. Environmental Factors • Air conditioning and heating systems accelerate tear evaporation. • Dry, windy, or smoky environments can irritate the ocular surface. • Excessive ultraviolet (UV) exposure may contribute to ocular surface stress. • Low humidity environments often worsen dry eye symptoms. 3. Medication-Related Causes • Antihistamines may reduce tear production. • Antidepressants can contribute to ocular dryness. • Certain antihypertensive medications are associated with dry eye symptoms. • Some systemic medications may affect tear secretion and tear film stability. 4. Systemic and Ocular Diseases • Sjögren syndrome and other autoimmune diseases can significantly reduce tear production. • Diabetes mellitus may affect corneal nerves and tear function. • Thyroid eye disease can alter blink mechanics and ocular surface health. • Blepharitis and meibomian gland dysfunction are common contributors to evaporative dry eye. 5. Demodex and Eyelid Disorders • Demodex infestation may contribute to chronic eyelid inflammation. • Meibomian gland dysfunction (MGD) is one of the leading causes of evaporative dry eye. • Chronic blepharitis can destabilize the tear film and worsen symptoms. Key Clinical Concept: Tear Film Instability • The central mechanism in many dry eye cases is tear film instability. • An unstable tear film breaks up prematurely, exposing the ocular surface. • This can lead to irritation, inflammation, blurred vision, and ocular discomfort. Common Symptoms • Burning or stinging sensation • Foreign body sensation • Eye redness • Excessive tearing (reflex tearing) • Fluctuating or blurred vision • Light sensitivity • Eye fatigue Management Strategies • Use preservative-free artificial tears when appropriate. • Follow the 20-20-20 rule during screen use. • Maintain adequate hydration. • Treat underlying eyelid disease and meibomian gland dysfunction. • Optimize environmental humidity and reduce exposure to irritants. • Seek professional evaluation for persistent symptoms.

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