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What is Dry Eye?
Dry Eye Disease is a common and often chronic medical condition that occurs when your eyes do not produce the right quantity or quality of tears to stay lubricated and healthy. It is one of the most frequent reasons people visit an eye doctor.
While it might seem like a simple irritation, dry eye is a complex disease. It involves a self-perpetuating "vicious cycle" where tear instability leads to inflammation on the surface of the eye. This inflammation, in turn, damages the eye's surface and tear-producing glands, which makes the tear film even more unstable. The goal of treatment is to break this cycle to provide lasting relief.
Your Tear Film: The Eye's Protective Shield
A healthy tear film is not just water. It is a sophisticated, three-layered coating that protects and nourishes your eye, providing clear vision.
- The Oily (Lipid) Layer: The outer layer is an oil produced by tiny meibomian glands in your eyelids. It acts like a sealant, preventing the watery layer from evaporating too quickly.
- The Watery (Aqueous) Layer: The middle and thickest layer is the "tear" fluid produced by the lacrimal glands. It provides moisture, washes away debris, and fights infection.
- The Mucus (Mucin) Layer: The inner layer is sticky, helping the watery layer to spread evenly across the eye's surface.
A problem with any of these layers can lead to dry eye symptoms.
The Two Main Types of Dry Eye
To treat dry eye effectively, your doctor will determine its underlying cause. There are two main types, and many people have a combination of both.
- Aqueous Deficient Dry Eye: This type occurs when your lacrimal glands do not produce enough of the watery component of tears. It accounts for about 10-15% of cases and is often associated with aging, hormonal changes, or systemic autoimmune diseases like Sjögren's syndrome and rheumatoid arthritis.
- Evaporative Dry Eye: This is the most common form, responsible for over 85% of all cases. Here, your glands produce enough watery tears, but they evaporate too quickly from the eye's surface. This is almost always caused by a problem with the oily layer, due to blockages in the meibomian glands within the eyelids.
Symptoms & Aggravating Factors
Dry eye can cause a wide range of symptoms, which can vary from day to day this can cause:
- A stinging, burning, or scratchy feeling
- Grittiness, or a feeling of sand in the eyes
- Redness and irritation
- Sensitivity to light
- Eye fatigue or heavy eyelids
- Blurry or fluctuating vision, especially with reading or screen use
- Difficulty wearing contact lenses
The Watery Eye Paradox
Confusingly, dry eyes can sometimes be excessively watery. This is called reflex tearing. When the eye surface becomes very irritated, it sends a distress signal for a flood of emergency tears. However, these tears are mostly water and lack the proper oil and mucus layers, so they don't lubricate effectively and just spill over your eyelids.
Things that can aggravating dry eyes are:
- Dry, windy, or low-humidity environments (including air conditioning and heating)
- Prolonged screen use (computers, phones) due to reduced blinking
- Smoking or exposure to smoke
- Certain medications (e.g., antihistamines, decongestants, some antidepressants)
- Aging and hormonal changes (especially menopause)
The Eyelid Connection: MGD & Blepharitis
For the vast majority of people with dry eye, the root of the problem lies in the eyelids.
- Meibomian Gland Dysfunction (MGD): This is the primary cause of evaporative dry eye. It occurs when the tiny oil glands (meibomian glands) in your eyelids become clogged. Instead of a clear oil, the glands produce a thick, waxy substance that blocks the gland openings. Without this oil, your tears evaporate too quickly, causing dryness and inflammation.
- Blepharitis: This is a general term for eyelid inflammation. It often appears as redness, crusting, or flaking along the lash line. Blepharitis and MGD are very closely linked; inflammation can cause MGD, and the blocked glands of MGD can worsen blepharitis.
Because these conditions are so intertwined, successful treatment must focus on the health of the eyelids.
Treatment
Step 1 to Treatment: At-Home Care & Lifestyle Changes
This is the foundation of all dry eye management and can provide significant relief.
Daily Eyelid Hygiene:
- Warm Compresses: Apply a warm, moist cloth or a reusable heated eye mask to closed eyelids for 5-10 minutes. This helps melt the hardened oil blocking the glands. Reusable masks are often better as they hold a consistent temperature longer.
- Gentle Lid Massage: Immediately after the compress, use a clean finger to gently massage the eyelids towards the lash line to help express the melted oil.
- Eyelid Cleansing: Use a commercial lid wipe, foam, or a gentle cleanser (like diluted baby shampoo) on a cotton bud to clean away expressed oil and debris from the base of your eyelashes.
Lifestyle Adjustments:
- Blink More: When using screens, follow the "20-20-20 rule": every 20 minutes, look at something 20 feet away for 20 seconds to encourage blinking.
- Control Your Environment: Use a humidifier, avoid direct air from fans or vents, and wear wraparound sunglasses outdoors.
- Nutrition: Some studies suggest omega-3 fatty acids (from fish or flaxseed oil) may improve oil gland function, but other large studies have not found a significant benefit. Discuss this with your doctor.
Step 2 to Treatment: Over-the-Counter Eye Drops
Artificial tears can supplement your natural tears and provide symptom relief. They come in different thicknesses.
- Liquid Drops: Thin and watery, best for mild symptoms and daytime use.
- Gel Drops: Thicker for longer-lasting relief, but may cause temporary blurriness. Good for moderate symptoms.
- Ointments: Very thick and greasy, providing a protective barrier. Best for severe dryness and use only at bedtime, as they cause significant blurring.
Preservative vs. Preservative-Free:
- Preserved: Come in multi-dose bottles. The preservatives prevent bacterial growth but can be irritating and worsen dry eye if used frequently (more than 4-6 times a day).
- Preservative-Free: Recommended for moderate-to-severe dry eye or frequent use. They come in single-use vials or special multi-dose bottles with a filtering tip. They are gentler on the eye's surface.
Warning: Avoid drops marketed for "redness relief." They constrict blood vessels for a cosmetic effect but don't treat the underlying problem and can cause rebound redness.
Step 3 to Treatment: Prescription Treatments
If over-the-counter options are not enough, your doctor may prescribe medication to target the underlying causes of dry eye, such as inflammation or infection.
- Short-Term Corticosteroid Drops: These are powerful anti-inflammatory drops used for short periods to control severe flare-ups. They provide rapid relief from inflammation and can be used to break the cycle of irritation, often while longer-term medications start to work. Due to potential side effects, they are not intended for continuous, long-term use.
- Antibiotics and Combination Therapy: If blepharitis is caused or worsened by a bacterial infection, your doctor may prescribe antibiotic eye drops or ointments. In some cases, oral antibiotics are used to help with inflammation. This dual-action approach can be very effective for controlling flare-ups.
- Immunomodulators (Anti-inflammatory Drops): These medications work by reducing the specific inflammation that damages your tear glands and eye surface. This helps your body produce more of its own healthy tears. These treatments require consistent, daily use and can take several weeks or months to show their full effect, making them suitable for long-term management.
Step 4 to Treatment: In-Office & Advanced Procedures
For persistent or severe dry eye, your doctor may recommend an in-office procedure.
- Punctal Plugs: For those with low tear production (aqueous deficiency), tiny plugs can be inserted into the tear drainage ducts in the corners of your eyelids. This acts like a stopper in a sink, keeping your natural tears on the eye surface for longer. The procedure is simple and painless.
- Thermal Pulsation: This in-office treatment is for MGD. A device applies controlled heat and gentle, pulsating pressure to the eyelids to effectively melt and express the blockages from the meibomian glands. There is published evidence to support this treatment but we don’t offer it at Frimley Health. Some optometrists and private clinics provide it.
- Intense Pulsed Light (IPL) This therapy uses specific wavelengths of light applied to the skin around the eyelids. It reduces inflammation, closes off abnormal blood vessels that contribute to MGD, and can help liquefy blockages in the glands. It is particularly useful for patients who also have skin conditions like rosacea. There is published evidence to support this treatment but we don’t offer it at Frimley Health. Some optometrists and private clinics provide it.
Partnering With Your Eye Doctor
Managing dry eye is a team effort. To get the most from your appointment, be prepared to discuss:
- Your specific symptoms (burning, itching, watering, etc.).
- When symptoms are worst (morning vs. end of day).
- Activities or environments that trigger your symptoms.
- All medications you take and any other health conditions you have.
What to Expect at Your Exam:
Your doctor will perform a thorough examination, which may include using special dyes to see damaged areas on your eye, measuring how quickly your tears break up, and assessing the quantity and quality of your tears and meibomian gland oils.
When to Seek Immediate Care:
Contact your doctor right away for severe eye pain, sudden vision loss, or thick, pus-like discharge.
Dry eye is a chronic condition that requires ongoing management. It is important to remember that treatment is a marathon, not a sprint, and there is often no one-time cure. Working closely with your eye doctor and adhering to your treatment plan is the key to finding lasting comfort and maintaining the health of your eyes.
Contact us
If you have any queries relating to this information, please contact the Ophthalmology service.
About this information
Service:
Ophthalmology
Reference:
QQ/063
Approval date:
12 June 2026
Review date:
1 June 2029
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Important note
This page provides general information only. It is developed by clinical staff and is reviewed regularly every 3 years for accuracy. For personal advice about your health, or if you have any concerns, please speak to your doctor.