Dry Eye Disease: Symptoms, Causes & Treatment

Dry Eye Disease is a common condition affecting millions worldwide, particularly in hot and arid regions like Jordan and the Middle East. It occurs when the eyes fail to produce enough tears or when the tears produced are of poor quality (chemically imbalanced), preventing adequate protection and nourishment of the eye surface.

Tears play a vital role: they provide lubrication, nutrition, infection protection, and removal of foreign particles. Healthy tears consist of three layers: an outer oily layer (from meibomian glands), a middle watery layer (from lacrimal glands), and an inner mucous layer. When the balance between these layers is disrupted or the total tear volume decreases, dry eye develops.

The condition affects 5-30% of the population depending on geography and age, increasing with advancing age and screen time. In Jordan and Arab countries, climatic conditions (heat and aridity) and air quality significantly contribute to the rising prevalence of dry eye disease. It ranges from mild, temporary discomfort to severe cases affecting quality of life and vision.

Dry eye symptoms vary widely from person to person and range from mild to severe. Some patients experience symptoms in one or both eyes. Symptoms typically worsen gradually and are exacerbated at certain times (especially during screen use) and in dry conditions.

• Burning or Stinging Sensation: Sharp or mild prickling sensation in the eye, especially toward end of day.
• Eye Dryness: Perception that the eye lacks natural moisture.
• Redness: Visible redness of the white of the eye or eyelid.
• Gritty Feeling: Uncomfortable sensation of sand or a foreign particle in the eye.
• Blurred or Fluctuating Vision: Unclear vision that slightly improves with blinking; may worsen with fatigue.
• Light Sensitivity: Discomfort or pain with bright light or direct sunlight exposure.
• Excessive Tearing: Paradoxically, severe dryness can trigger excessive tearing as a reflex response.
• Contact Lens Intolerance: Discomfort or inability to tolerate contact lens wear.
• Eye Strain: Quick fatigue of eyes during reading or computer use.
• Pain During Visual Tasks: Increased symptoms with activities requiring visual focus.
• Lid Redness and Mild Swelling: Particularly at inner eye corners or along eyelid margins.
• Difficulty with Night Driving: Symptoms may worsen at night or during prolonged driving.

Note: Women may experience worse symptoms post-menopause; older adults may note gradual symptom progression.

• Reduced Tear Production (Aqueous Deficiency): Lacrimal gland secretion decreases due to aging, gland inflammation, autoimmune diseases (e.g., Sjögren's syndrome), or nerve damage.
• Poor Tear Quality (Evaporative Dry Eye): Tears evaporate too quickly due to deficient lipid layer, usually from blocked or inflamed meibomian glands (posterior blepharitis).
• Tear Chemical Imbalance: Even adequate tear volume may be chemically unbalanced (deficient salts or protective proteins), reducing effectiveness.
• Climate and Environmental Factors: Dry, hot air (common in Jordan), air pollution, and strong winds increase tear evaporation and irritate the eye surface.
• Prolonged Screen Use: Reduces blinking when viewing screens, lowering corneal hydration and increasing evaporation.
• Medication Side Effects: Some drugs (antidepressants, antihistamines, diuretics) reduce tear secretion.
• Chronic Medical Conditions: Diabetes, thyroid disease, lupus, and rheumatoid arthritis increase dry eye risk.
• Eye Surgery: Procedures like LASIK or other surgeries may temporarily or permanently affect tear production.

• Advanced Age: Tear production decreases gradually with aging, especially after age 50.
• Female Gender: Women are more susceptible (especially post-menopause) due to hormonal changes.
• Contact Lens Use: Lenses reduce oxygen absorption and may increase dryness with prolonged wear.
• Arid Climate: Living in dry regions like Jordan and deserts is a direct risk factor.
• Seasonal Allergies: Cause inflammation affecting tear production.
• Autoimmune Diseases: Sjögren's syndrome, lupus, and rheumatoid arthritis significantly increase risk.
• Hormonal Medications: Oral contraceptives and hormone replacement therapy may worsen dry eye.
• Diabetes and Endocrine Disorders: Affect lacrimal and meibomian gland function.
• Previous Eye Surgery: Especially eyelid or eye procedures.
• Smoking and Air Pollution: Increase inflammation and accelerate tear evaporation.

Diagnosis of dry eye disease involves comprehensive clinical evaluation combining patient history, physical examination, and specialized tests. No single test is definitive; diagnosis relies on a combination of findings.

• Slit Lamp Examination: Allows the physician to visualize the eye surface and eyelids in high detail. Any redness, inflammation, or corneal changes become apparent.
• Schirmer Test: A thin filter paper strip is placed under the lower eyelid for 5 minutes to measure tear secretion. Normal: >15 mm of wetting in 5 minutes. <5 mm suggests severe dryness. (Note: This test is less commonly used now; tear osmolarity is preferred).
• Tear Break-Up Time (TBUT): After fluorescein staining, the physician measures how many seconds before tears separate from the eye surface. Normal: >15 seconds. <5 seconds indicates rapid evaporation.
• Tear Osmolarity Test: Measures salt and dissolved element concentration. High values (>308 mOsm/kg) indicate imbalance and dryness.
• Vital Dye Staining (Fluorescein and Lissamine Green): Colored dyes reveal areas of cell damage on the eye surface. Staining of cornea or conjunctiva confirms dry eye.
• Meibography: Special imaging assesses meibomian gland function and detects blockage or atrophy.
• Ocular Surface Disease Index (OSDI) Questionnaire: A standardized 12-question survey assessing symptom severity and impact on quality of life. Score >23 suggests moderate to severe dryness.

Medications

• Artificial Tears / Lubricating Eye Drops: First-line treatment providing temporary lubrication. Various formulations exist (water, oil, mucin-based). Use as needed multiple times daily. Examples include hyaluronic acid solutions and mineral oil drops. Preservative-free or low-preservative versions are better for frequent use.
• Cyclosporine (Restasis): Daily drops that reduce inflammation and vasodilation, increasing natural tear production. Takes 2-3 weeks to show effect. Use twice daily. Particularly effective for inflammation-related dryness.
• Lifitegrast (Xiidra): Newer drops reducing inflammation and boosting tear secretion. Use twice daily with faster results than cyclosporine (approximately one week).
• Phosphodiesterase-4 Inhibitors (Opzelura - Roflumilast): New topical cream reducing eyelid inflammation. Apply once daily.
• Topical Corticosteroids: Short-term use (1-2 weeks) to reduce acute inflammation. Avoid prolonged use due to side effects (glaucoma and cataracts). Examples: prednisolone 1%, dexamethasone.
• Osmolyte-Containing Drops: Such as those with gellcam or carboxymethyl cellulose, providing additional corneal protection.
• Oral Medications (when necessary): Omega-3 and omega-6 supplements improve tear quality; use daily for weeks. Cholinergic agonists (e.g., pilocarpine) may increase tear secretion in severe cases.

Procedures and Topical Treatments

• Warm Compress or Eye Steam Bath: Apply warm, moist compress to eyelids 10-15 minutes daily to unblock meibomian glands and improve oil flow.
• Lid Scrubs and Eyelid Cleaning: Gently clean eyelid margins with specialized lid shampoo (Baby Shampoo or professional products) to remove secretions and bacteria.
• Meibomian Gland Massage: Gentle massage to release accumulated lipid secretions. Can be performed at home or by physician.
• Warm Compress Therapy / IPL (Intense Pulsed Light): Specialized devices applying heat and pressure to unblock glands. Safe and effective; repeat every 2-4 weeks.
• Neurostimulation: Modern devices stimulate nerves responsible for tear secretion, used in chronic severe cases.
• Punctal Plugs (Tear Duct Plugs): Small plugs inserted into tear drainage openings to prevent tear loss and maintain ocular surface wetting longer. Used in moderate to severe cases; can be temporary or permanent.
• Punctal Cautery: Permanent closure of drainage openings via heat or laser when temporary plugs fail—a definitive solution for severe cases.
• Eyelid Surgery (when needed): Reshape eyelids or correct entropion/ectropion that may cause dryness.

Lifestyle Changes and Habits

• Take Screen Breaks: Follow the 20-20-20 rule—every 20 minutes, look at something 20 feet away for 20 seconds. Reduces eye strain and increases blinking.
• Increase Conscious Blinking: Screen viewing reduces blinking. Remind yourself to blink fully and frequently.
• Improve Ambient Air Quality: Use a humidifier, especially at night or in dry weather. Avoid direct air currents (AC, heaters). In Jordan's arid climate, a dedicated humidifier may be necessary during summer.
• Avoid Symptom Triggers: Reduce prolonged reading, avoid smoky environments, wear UV-protective sunglasses outdoors.
• Improve Diet: Consume omega-3-rich fatty fish (salmon, herring), nuts, and seeds. Drink adequate water (at least 8 cups daily).
• Quit Smoking and Avoid Secondhand Smoke: Smoking increases inflammation and accelerates tear evaporation.
• Maintain Eyelid Health: Routine lid hygiene, avoid vigorous eye rubbing, use safe eye makeup and remove it carefully.
• Manage Underlying Medical Conditions: Good control of diabetes and thyroid disease reduces dry eye severity.
• Review Medications: Consult your doctor if you take drugs causing dry eye (antidepressants, diuretics). Medication change or dose adjustment may help.

• Corneal Ulcer: Severe, persistent dryness can erode the cornea and form an ulcer—a medical emergency that may cause permanent vision loss if untreated promptly.
• Bacterial Infection: Tears provide microbial protection. Severe dryness increases risk of bacterial conjunctivitis or keratitis.
• Corneal Scarring: In chronic, severe cases, permanent scars may develop on the cornea, causing irreversible vision loss.
• Permanent Vision Blur: Ongoing inflammation and corneal surface changes may result in persistent blur or halos around lights, especially during night vision.
• Chronic Meibomian Gland Dysfunction: Persistent dryness can cause gland atrophy and permanent loss of function, worsening the condition.
• Symblepharon (Eyelid Adhesions): In very severe cases (especially post-chemical burn or trauma), eyelid and conjunctival tissues may adhere together.
• Chronic Conjunctivitis and Inflammation: Persistent inflammation can enlarge blood vessels and cause chronic redness affecting quality of life and appearance.
• Severe Dry Eye Syndrome: In rare, extremely severe cases (advanced Sjögren's syndrome), complete vision loss in the affected eye may occur.

• Maintain Eyelid and Eye Hygiene: Wash face with clean warm water daily; avoid vigorous eye rubbing. Clean eyelids regularly to prevent bacterial and secretion buildup.
• Take Breaks from Screens: Reduce phone, computer, and tablet use. Follow the 20-20-20 rule. Take regular breaks every hour.
• Wear Protective and Sunglasses: Use sunglasses outdoors to minimize wind, dust, and UV exposure. Wear safety glasses in dry or dusty work environments.
• Improve Environmental Humidity: Use a humidifier at home and office, especially in dry climates like Jordan. Avoid sitting near dry air sources (heaters, AC units).
• Eat an Omega-3-Rich Diet: Increase fatty fish (salmon, mackerel), fish oil supplements, nuts, and seeds. These improve tear composition and reduce inflammation.
• Drink Adequate Water: Body hydration is essential for healthy tear production. Drink at least 8-10 cups daily.
• Quit Smoking and Avoid Secondhand Smoke: Smoking accelerates tear evaporation and increases inflammation. Avoid smoke exposure.
• Manage Chronic Medical Conditions: Good control of diabetes, thyroid disease, and autoimmune disorders reduces dry eye risk. Adhere to prescribed treatments.
• Review Your Medications: If your medications cause dry eye, consult your doctor for alternatives. Not all medications carry equal risk.
• Regular Eye Exams: Annual check-ups with an ophthalmologist detect dry eye in early stages. Essential if you have risk factors (age, female gender, chronic diseases).