Dry eye syndrome — sometimes called dry eye disease — affects millions of people and can range from a mild annoyance to a vision-limiting problem. Knowing what causes your dry eye is the first step toward effective, personalized care and lasting symptom relief.
How tears keep your eyes healthy
Tears are more than “water.” The tear film is a thin, multi-layered coat that covers the surface of the eye and performs three main jobs: provide oxygen and nutrients to the surface cells, remove debris, and create a smooth optical surface for clear vision. The tear film has three layers:
- Lipid layer (outer) — produced by the meibomian glands; prevents rapid evaporation.
- Aqueous layer (middle) — produced by the lacrimal glands; supplies moisture and nutrients.
- Mucin layer (inner) — produced by conjunctival goblet cells; helps tears spread evenly over the eye.
When any part of this system is disrupted — whether the glands aren’t producing enough tears, the oil layer is poor quality, or the eyelids don’t blink properly — the tear film becomes unstable and dry eye symptoms begin.
Common causes of dry eye
Dry eye is often multifactorial — more than one contributing cause can be present. Understanding the underlying drivers guides targeted treatment.
Meibomian gland dysfunction (MGD)
MGD is the leading cause of evaporative dry eye. Meibomian glands along the eyelid margin secrete the oily layer of the tear film. When these glands become clogged, inflamed, or atrophic, the lipid layer thins and tears evaporate quickly. Symptoms include grittiness, burning, fluctuating vision, and a heavy feeling in the lids.
Low tear production (aqueous deficiency)
Some people do not make enough watery tears. Causes include age-related decline, lacrimal gland dysfunction, systemic autoimmune diseases such as Sjögren’s syndrome, and certain medications.
Blepharitis, allergies, and ocular surface inflammation
Chronic inflammation of the eyelid margin (blepharitis) or allergic conjunctivitis can disrupt tear quality and production. Inflammation impairs the goblet cells and meibomian glands, worsening tear instability.
Environmental and lifestyle factors
- Prolonged screen time — reduced blink rate and incomplete blinks mean the tear film is not refreshed as often.
- Dry or windy environments, air-conditioning, and low humidity.
- Contact lens wear — can accelerate tear-film breakdown and increase discomfort for some wearers.
- Tobacco smoke and air pollutants.
Medications and systemic conditions
Many commonly prescribed medications can reduce tear production or change tear chemistry, including antihistamines, some antidepressants, certain blood-pressure medications, isotretinoin, and oral contraceptives in susceptible individuals. Systemic illnesses like diabetes and thyroid disease also increase dry eye risk.
Anatomical and surgical causes
Problems with the eyelids (e.g., incomplete eyelid closure, eyelid malposition) or a history of refractive surgery (such as LASIK) can disrupt the tear film and nerve feedback that stimulates tear production.
How we evaluate dry eye
A careful, structured exam identifies the dominant cause(s) of dry eye so treatment can be tailored. Common tests include:
- Symptom inventory and history: to learn about onset, medications, contact lens use, and environmental triggers.
- Slit-lamp exam: assesses eyelid margins, meibomian gland expression, conjunctiva, and corneal staining.
- Tear break-up time (TBUT): measures tear stability; short TBUT suggests evaporative dry eye.
- Tear osmolarity and inflammatory markers: when available, these help quantify disease severity.
- Meibography: imaging of meibomian glands to detect dropout or structural changes.
- Schirmer testing or phenol red thread test: measures tear volume in suspected aqueous deficiency.
These findings are integrated to create a diagnosis and personalized treatment plan. Because dry eye can change over time, follow-up measurements are important to assess response.
Treatment options: from home care to advanced therapies
Treatment is stepwise and individualized. What works for one person may not work for another, and many patients benefit from combination therapy.
Conservative and at-home measures
- Eyelid hygiene: gentle cleansing, warm compresses, and lid massage to improve meibomian gland function.
- Environmental adjustments: humidifiers, minimizing direct air flow, and taking regular screen breaks with deliberate full blinks.
- Artificial tears: preservative-free lubricants used as needed; thicker gels or ointments at night if required.
- Nutritional and lifestyle changes: staying hydrated, smoking cessation, and discussing omega‑3 supplements with your clinician (evidence varies).
Clinic-based and prescription therapies
When home measures are insufficient, office-based treatments and prescription medications are considered:
- Prescription anti-inflammatory eye drops (for example, topical cyclosporine or lifitegrast) to reduce chronic surface inflammation and improve tear production over time.
- Punctal occlusion (temporary or permanent plugs) to conserve tears, typically after inflammation is controlled.
- Autologous serum or other biologic tear formulations for severe epithelial disease when standard drops are ineffective.
Procedures and devices
For patients with significant meibomian gland dysfunction or refractory symptoms, procedural options can improve gland function and comfort. Evolutionary Eye Care offers Low Level Light Therapy (LLLT) as part of our dry eye treatment options. LLLT is a non‑invasive light-based therapy that can reduce eyelid inflammation and improve meibum quality in some patients; it is used as part of a comprehensive treatment program and individual response varies. Other in-office thermal or mechanical therapies may also be appropriate depending on individual findings.
Scleral lenses for severe dry eye
For patients with severe ocular surface disease — including tear-film instability, corneal irregularity, or persistent epithelial defects — scleral contact lenses can provide significant symptom relief. Scleral lenses vault the cornea and create a fluid reservoir over the ocular surface, protecting and hydrating the eye while often improving vision and comfort. Scleral lenses require specialized fitting and ongoing follow-up; they address symptoms and vision but do not stop underlying disease processes.
When to seek evaluation and what to expect
See an eye care professional if you have persistent dryness, foreign-body sensation, burning, fluctuating vision, or frequent need for lubricants. Timely evaluation matters because chronic inflammation can harm the surface of the eye and, in advanced cases, threaten vision.
At your visit, we’ll take a focused history, perform targeted testing, and discuss a personalized care plan. Management often requires multiple visits to optimize treatment, monitor for side effects, and adjust therapies. If an autoimmune or systemic cause is suspected, we coordinate care with your primary care physician or specialists (for example, rheumatology).
Dry eye is common but treatable. With the right diagnosis and a tailored plan — which may include home care, prescription drops, in-office LLLT, or scleral lenses for advanced cases — many patients achieve meaningful improvement in comfort and vision. If you’re experiencing symptoms, schedule an evaluation with our team at Evolutionary Eye Care. We see patients at our Houston-area locations in Sugar Land, Webster, and Downtown Houston and will work with you to find the safest, most effective approach for your eyes.