Dry Eyes

Overview

Dry eyes occur when the surface of the eye is not kept properly moist, either because the eyes do not produce enough tears or because the tears evaporate too quickly. A healthy tear film coats the eye with a balanced mix of water, oil, and mucus, keeping vision clear and the surface comfortable. When that film is disrupted, the eye feels gritty, dry, stinging, or tired.

Dry eyes are very common, especially with age, long hours on screens, dry or windy environments, and certain medications. While usually a nuisance rather than a danger, chronic dryness can blur vision, make the eyes feel constantly irritated, and in severe cases damage the surface of the eye. Most people find relief with simple self-care and over-the-counter drops, but persistent or painful dryness deserves an eye examination to find the cause and protect long-term eye health.

Common Causes

Dry eyes result from either too few tears or tears that evaporate too fast. Common contributors include:

• Aging: Tear production naturally declines with age, especially after midlife.
• Screen use: Staring at screens reduces blinking, so the tear film dries out (sometimes called digital eye strain).
• Environment: Wind, smoke, dry indoor air, air conditioning, and high altitude speed up tear evaporation.
• Medications: Antihistamines, decongestants, certain blood pressure drugs, antidepressants, and hormone changes can reduce tears.
• Eyelid problems: Blocked oil glands (meibomian gland dysfunction) or incomplete blinking destabilize the tear film.
• Contact lenses: Long wear can dry the eyes.
• Medical conditions: Sjogren's syndrome, rheumatoid arthritis, thyroid disease, and diabetes can all reduce tear quality or quantity.

Associated Symptoms

Dry eyes can cause a range of sensations that may seem contradictory. You may notice:

• A gritty, sandy, or foreign-body feeling, as if something is in the eye
• Stinging, burning, or itching
• Redness and tired, heavy-feeling eyes
• Sensitivity to light
• Blurred vision that improves with blinking
• Stringy mucus in or around the eyes
• Watery eyes, paradoxically, as the eye over-produces tears in response to irritation
• Difficulty wearing contact lenses

Symptoms often worsen later in the day, in dry or windy conditions, and after long periods of reading or screen use.

Diagnosis & Evaluation

An eye care professional can usually diagnose dry eyes from your symptoms and an eye examination. Tests may include:

• Slit-lamp examination: A magnified look at the eye surface, tear film, and eyelids.
• Tear volume test (Schirmer test): Measuring how much tear fluid the eyes produce using a small paper strip.
• Tear film stability test: Measuring how quickly the tear film breaks up after a blink.
• Surface staining: Special dyes that highlight dry or damaged areas on the eye.
• Review of medications and health history: To identify contributing conditions such as Sjogren's syndrome.

Treatment & Management

Treatment aims to restore moisture and address the underlying cause.

• Artificial tears: Over-the-counter lubricating drops are the mainstay; preservative-free versions suit frequent use.
• Lubricating gels or ointments: Thicker products for nighttime relief.
• Warm compresses and lid hygiene: Help unblock oil glands and stabilize the tear film.
• Prescription drops: Anti-inflammatory drops that increase tear production for moderate to severe cases.
• Punctal plugs: Tiny plugs that block tear drainage to keep more moisture on the eye.
• Treating the cause: Adjusting medications, managing thyroid or autoimmune disease, and changing contact lens habits.

Self-Care & Prevention

• Take regular breaks from screens and blink fully and often (the 20-20-20 rule: every 20 minutes, look 20 feet away for 20 seconds)
• Use a humidifier to add moisture to dry indoor air
• Avoid direct wind, fans, and air vents blowing toward your eyes
• Wear wraparound sunglasses outdoors in wind or sun
• Stay well hydrated and consider omega-3 rich foods
• Position screens slightly below eye level to reduce exposure of the eye surface

When to See a Doctor

See an eye care professional if dry eyes are persistent, worsening, or not relieved by over-the-counter drops. Seek prompt care if you have:

• Eye pain, marked redness, or noticeable swelling
• Sudden changes in vision or vision loss
• A feeling that something is stuck in the eye that will not clear
• Light sensitivity that is severe or new
• Discharge that is thick, colored, or pus-like, which may signal infection

Severe eye pain with vision loss is an emergency and should be evaluated right away to protect your sight.

Related Topics

Frequently Asked Questions

References

1. National Eye Institute (NEI). Dry Eye.
2. Mayo Clinic. Dry eyes — Symptoms and causes.
3. American Academy of Ophthalmology. What Is Dry Eye?
4. MedlinePlus, U.S. National Library of Medicine. Dry eye.