Dry eyes

Age

As people age, the risk of developing dry eyes increases due to a natural decline in tear production. Individuals over the age of 65 often begin to notice dry eye symptoms.

Gender

Women are more prone to experiencing dry eyes, primarily due to hormonal changes during pregnancy and menopause. The use of oral contraceptives has also been linked to a higher risk of developing dry eyes.

Screen Time

Prolonged exposure to digital screens is a well-established risk factor for dry eyes. Extended screen use reduces the frequency of blinking, leading to faster tear evaporation, which contributes to dry eye symptoms.

Ethnicity

Research indicates that dry eyes are more prevalent among Asians compared to individuals of Caucasian descent.

Medical Conditions

Several inflammatory and autoimmune disorders can increase the likelihood of developing dry eyes, including:

• Rheumatoid arthritis
• Diabetes
• Thyroid disorders
• Blepharitis (inflammation of the eyelids)
• Rosacea
• Seborrhoeic dermatitis
• Staphylococcal infections
• Demodex mite infestations
• Bell's palsy
• Sjögren’s syndrome
• Graft-versus-host disease
• Herpes infection
• Hepatitis C
• Androgen deficiency
• Heat or chemical burns
• Acne
• Gout

Medications

Certain medications, including those for high blood pressure, allergies, depression, anxiety, cough, and insomnia, are associated with reduced tear production, leading to dry eyes.

External Exposure

Living in dry climates, exposure to chemical fumes, pollution, and sunlight can increase the risk of developing dry eyes. Smoking and secondhand smoke also significantly contribute to dry eye risk by exposing the eyes to irritants. Additionally, those who live in air-conditioned environments may be at a higher risk.

Contact Lenses

Wearing contact lenses can reduce corneal sensation, which can lead to dryness in the eyes.

Previous Eye Surgery

Eye surgeries, such as LASIK (laser eye surgery), lid surgery, or cataract surgery, may impair tear production, resulting in dry eyes.

Eye Drops

Overuse of topical medications, particularly those used to treat conditions like glaucoma, can increase the risk of developing dry eyes.

Diet

Proper nutrition is vital for eye health. Deficiencies in Vitamin A and omega-3 fatty acids can contribute to dry eyes. Vitamin A deficiency, known as xerophthalmia, can start with dry eyes and, in severe cases, lead to blindness.

Dry eye symptoms are often similar to those of eye infections and allergies, making it crucial to differentiate between these conditions through specific clinical tests. Misdiagnosing dry eyes as an allergy and administering antiallergic treatments can worsen the condition.

Patient History and Physical Examination

The doctor begins by gathering detailed information about the patient's medical history, including medications, existing health conditions, and environmental factors that may contribute to dry eyes. The examination includes checking:

• Tear production levels
• Eyelid structure
• Timing, location, and daily variation of symptoms
• Workplace-related stress
• Living conditions (dry air, air conditioning, etc.)
• Presence of systemic diseases
• Medication history

Examination of Tear Stability

Tear Break-Up Time (TBUT)

• This test assesses how long the tear film remains intact after a blink. A small amount of dye is applied to the eyes, and the time it takes for the tear film to break up after blinking is measured. A shortened tear film duration indicates dry eyes.

Examination of Tear Volume

Schirmer’s Test

• This test measures the quantity of tears produced by the eyes. The eyes are first numbed with eye drops, and a small piece of paper is placed at the eyelid's edge. The moisture absorbed by the paper in five minutes reflects the tear production level.

Tear Film Meniscus

• This test measures the height of the tear film, which helps determine how much tear fluid is being produced. In dry eye patients, tear meniscus height is typically lower than in healthy individuals.

Slit Lamp Test

• Using a microscope called a slit lamp, this test observes the amount of tears produced by the eyes. A special liquid is used to make tear production visible under the bright light directed into the eyes.

Examination of Tear Films

Tear Film Osmolarity

• This test measures the concentration of salts in the tears. Tear osmolarity increases with the severity of dry eyes, as normal osmolarity is necessary for optimal tear production.

Examination of the Ocular Surface

A slit lamp and dyes are used to examine the eye’s surface. The dyes help clearly visualize the surface, with common ones being fluorescein and lissamine green.

Fluorescein Staining

• This method is used to detect corneal damage. Fluorescein dye is applied to the tear film and observed for 1 to 3 minutes.

Lissamine Green Staining

• This dye is used to examine damage to the conjunctiva and eyelid margins, similarly to fluorescein staining.

Examination of Eyelids

Blink Rate

Blinking plays a crucial role in maintaining eye moisture by spreading tears across the eye surface. Normal blink rates are:

• Speaking: 15.5 ± 13.7 blinks per minute
• Reading or using computers: 5.3 ± 4.5 blinks per minute
• A reduced blink interval (less than 6 seconds) often indicates dry eyes.

Meibomian Gland Evaluation

These glands produce the oil layer that helps prevent tear evaporation. Dysfunction in these glands can cause dry eyes. Evaluating the quantity and quality of the oil produced by these glands helps determine if this is the cause of the dry eyes.

Differentiating Between Insufficient Tear Production and Excessive Tear Evaporation

The above tests also assist in identifying the specific cause of dry eyes:

• A reduced tear meniscus and low Schirmer test results suggest insufficient tear production.
• Altered eyelid margins, thickened meibomian gland secretion, and reduced tear break-up time point to evaporative dry eye.

Ocular surface damage and elevated tear film osmolarity may be present in both conditions.

Evaluation for Systemic Diseases

Dry eyes may be associated with systemic diseases, especially primary Sjögren's syndrome, or secondary Sjögren's syndrome caused by other conditions. These include:

• Rheumatoid arthritis
• Lupus
• Progressive systemic sclerosis
• Dermatomyositis

Other systemic conditions like Parkinson’s disease, androgen deficiency, thyroid disorders, and diabetes are also linked to dry eyes. If suspected, these conditions should also be clinically evaluated.

Specialist to Consult

It is essential to consult a doctor if you experience:

• Persistent burning, stinging, or scratching sensations, or excessive watering of the eyes, particularly in windy conditions
• Symptoms that don't improve with common home remedies
• Fluctuating vision while using digital devices, even with glasses
• Difficulty in performing routine tasks due to eye discomfort

Doctors who can help diagnose dry eyes include:

• General physicians
• Optometrists
• Ophthalmologists

Blink Regularly

Blinking is essential for spreading tears over the eye's surface and keeping out irritants. Blinking more often, especially when using digital screens, can help keep the eyes moist and prevent dryness.

Increase Humidity

Dry air can trigger dry eyes. To combat this, increase humidity by placing bowls of water around your home or office. This helps create a more humid environment.

Avoid Eye Strain

Prolonged focus on tasks can cause eye strain. It is advisable to minimize or avoid activities that require intense concentration, such as:

• Using computers, smartphones, or tablets for extended periods
• Driving for long hours
• Reading in dim light or for long periods

Protect Your Eyes

To prevent dry eyes, protect them from irritants. Wear protective glasses when using digital screens, and use sunglasses outdoors to shield your eyes from dry winds, sunlight, and smoke.

Limit Screen Time

Extended screen use is a major contributor to eye strain and dryness, often leading to computer vision syndrome (CVS). To reduce the risk, follow the 20/20/20 rule: take a 20-second break every 20 minutes of screen use, focusing on something 20 feet away. Set reminders on your phone to help you remember.

Quit Smoking

Cigarette smoke contains harmful chemicals that can lead to dry eyes. Quitting smoking, along with avoiding exposure to secondhand smoke, can help prevent the condition.

The treatment for dry eyes depends on the severity of the condition, and avoiding triggers like cigarette smoke and dry air is a critical part of management.

Artificial Tears

Artificial tears are the primary treatment for all stages of dry eye disease, regardless of severity. These preservative-free drops help stabilize the tear film. Common agents in these drops include polyvinyl alcohol, povidone, hydroxypropyl guar, cellulose derivatives, and hyaluronic acid. Gels, ointments, and solutions are available for various needs. For meibomian gland dysfunction, artificial tears containing lipids like triglycerides, phospholipids, and castor oil are recommended.

Anti-Inflammatory Medications

Moderate to severe dry eyes often involve inflammation of the ocular surface and lacrimal glands. Anti-inflammatory treatments are used to manage these conditions in more advanced stages.

Topical Corticosteroids

Corticosteroid eye drops can be effective in reducing dry eye symptoms, typically when used for 2 to 4 weeks. However, long-term use is discouraged due to potential complications.

Topical Cyclosporine A

Cyclosporine A is an immunosuppressant that reduces inflammation and increases tear production. It also helps alleviate symptoms like blurry vision and dryness. For patients who are intolerant to cyclosporine, tacrolimus eye drops can be used as an alternative.

Antibiotics

Antibiotics with anti-inflammatory properties are used when dry eyes are linked to meibomian gland dysfunction or blepharitis. Commonly prescribed antibiotics include doxycycline, minocycline, and azithromycin.

Punctal Plugs

Punctal plugs are small devices inserted into the tear ducts to reduce tear drainage, helping keep the eyes moist. There are two types:

• Temporary/Dissolving Plugs: Made from materials like collagen, these dissolve over time and can last from a few days to months.
• Semi-Permanent Plugs: Made from more durable materials like silicone or acrylic, these plugs can remain in the eyes for years and can be removed if necessary.

Surgical Options

In severe cases of dry eyes, surgical treatments may be considered:

• Tarsorrhaphy: A procedure where the upper and lower eyelids are partially or fully sewn together to support corneal healing.
• Amniotic Membrane Transplantation: A piece of amniotic membrane is applied to the eye surface to promote healing and reconstruct the ocular surface.
• Keratoplasty: A corneal transplant surgery, typically reserved for cases with persistent corneal ulcers or perforations.

Eye-Related Complications

When tear production is insufficient, it can lead to various complications ranging from mild to severe. Initially, dry eyes cause minimal discomfort, but untreated, the condition can harm the cornea. Potential complications include:

• Vision fluctuations
• Corneal scarring
• Infectious keratitis (infection of the cornea caused by bacteria, viruses, fungi, or parasites)
• Eye ulcers
• Eye infections
• Eye inflammation
• Corneal wounds
• Conjunctivitis
• Vision loss

Other Health Complications

Chronic dry eyes can significantly affect your quality of life, leading to:

• Anxiety
• Depression
• Sleep disturbances
• Mood disorders
• Dyslipidemia
• Migraines

Herbal Remedies

• Goji Berries: Native to Asia, these berries have medicinal and nutritional benefits. Research indicates that goji berry extract can alleviate dry eyes, improving tear production and stability as seen in tests like Schirmer’s and Tear Breakup Time (TBUT).

• Polygonum Cuspidatum: A plant found in North America and Asia, often used in traditional Japanese and Chinese medicine. Studies suggest that its extract helps preserve eye health due to its anti-inflammatory properties.

• Chamomile: Chamomile tea can be used to wash the eyes, which may help treat eye infections and other eye-related conditions.

Avoid Self-Medication

Certain medications can contribute to eye dryness. Always consult your healthcare provider before taking any medication to avoid exacerbating dry eyes.

Focus on a Nutrient-Rich Diet

Specific vitamins, minerals, and fatty acids can help maintain eye hydration. Incorporating these into your diet is beneficial:

• Omega Fatty Acids (found in fish, oils, and dairy products)
• Vitamin A (available in pumpkins, apricots, carrots, tomatoes, spinach, and dairy products)
• Vitamin C (found in citrus fruits like oranges, grapefruits, and lemons, as well as apples, bananas, tomatoes, and cooked spinach)
• Zinc (found in whole grains, dairy, sweet corn, peas, lentils, and nuts)
• Lutein and Zeaxanthin (found in eggs, corn, kiwi, grapes, zucchini, and leafy greens such as spinach, kale, and broccoli)
• Vitamin E (present in whole grain cereals, almonds, hazelnuts, sunflower seeds, sweet potatoes, and peanut butter)

Stay Hydrated

Drinking plenty of water helps with tear formation. Dehydration can worsen dry eye symptoms, particularly in hot or dry environments.

Ensure Adequate Sleep

Lack of sleep can cause dry, itchy eyes. It’s also noted that insufficient sleep may reduce tear production. Getting enough rest can support quicker recovery from dry eye symptoms.

Maintain Eyelid Hygiene

Keeping your eyelids clean is essential. Using hot compresses or warming masks on the eyelids can help increase the stability of the tear film and improve the lipid layer.

Avoid Dry Environments

Dry air can exacerbate dry eyes. Protect your eyes by avoiding direct airflow, such as directing car heaters away from your face.

Explore Home Remedies

Several home remedies can help relieve dry eye symptoms. These include applying warm compresses to the eyes, taking fish oil supplements, staying well-hydrated, and using a humidifier at home or work to increase the air's moisture.

Consider Scleral Contact Lenses

For individuals who wear contact lenses and suffer from dry eyes, switching to scleral lenses may be beneficial. These lenses sit on the sclera (the white part of the eye), providing protection and moisture retention for longer periods compared to traditional lenses.

Take Frequent Breaks

It’s essential to take regular short breaks and blink frequently when reading or working on a computer. Whenever possible, close your eyes for a few moments, such as during a phone call, to reduce eye strain.

Adjust Your Computer Screen Position

Looking down reduces the exposure of the eye surface and slows tear evaporation, helping to keep the eyes moist. To implement this while using a computer, position the screen at a lower angle.

Adjust Lighting

Dry eye sufferers often experience heightened sensitivity to light. You can minimize this discomfort by avoiding overhead bright lights and reducing glare on screens and other surfaces.

Avoid Vents

Try to stay away from direct airflows from vents, as the dry air blowing into your eyes can worsen dryness.

Keep Eye Drops Accessible

Always carry eye drops to combat dryness when it occurs. This will help keep your eyes lubricated throughout the day.

Join a Support Group

Connecting with others who have similar experiences can provide valuable insights and support for managing dry eyes and promoting faster recovery.