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Dry eye syndrome is an ocular surface disease caused by an imbalance in the tear film. It may occur when an insufficient amount of tears is produced or when tears evaporate more quickly than normal. When the ocular surface is not adequately protected, burning, irritation, redness and temporary blurred vision may occur. Ageing, prolonged screen use, hormonal changes and certain diseases may increase the risk of dry eye. The severity of symptoms varies between patients and may change throughout the day. Treatment is determined by assessing the quantity and quality of the tears and the effect on the ocular surface.
How Does Dry Eye Syndrome Develop?
The ocular surface must be regularly protected by tears because it is constantly exposed to the external environment. A healthy tear film helps keep the cornea and conjunctiva moist. Reduced tear production or rapid evaporation disrupts the integrity of this protective layer. When the amount of water in the tears decreases, the remaining fluid may become more concentrated. This may cause irritation and inflammation of the cells on the ocular surface. If inflammation continues, the function of the tear glands and ocular surface may become further impaired.
Dry eye syndrome causes mild symptoms in some patients but may lead to more pronounced surface damage in others. The severity of dry eye cannot be determined solely by the level of discomfort experienced. Some people may have pronounced symptoms despite limited surface damage. In others, significant corneal changes may be detected even though their symptoms are milder. The tear structure and ocular surface must therefore be examined together. The treatment plan is prepared by considering the factors that initiated the condition and the existing findings.
Main Layers of the Tear Film
Tears do not consist only of water and contain different components that protect the ocular surface. The tear film is traditionally evaluated according to its lipid, aqueous and mucin components. The lipid component helps reduce rapid evaporation of tears. The aqueous component moisturises and cleans the ocular surface. The mucin component helps the tears spread evenly across the ocular surface. A problem affecting any of these structures may impair the stability of the tear film.
The main components of the tear film are:
- Lipid layer.
- Aqueous layer.
- Mucin component.
The lipid layer is produced by the meibomian glands along the eyelid margins. When the secretion from these glands decreases or the glands become blocked, tears may evaporate more quickly. The aqueous layer contains fluid produced by the tear glands and various proteins that help protect the ocular surface. Mucin is produced by cells on the ocular surface and supports the even distribution of tears. These components are not completely independent but are parts of a system that works together. A dry eye assessment attempts to determine which component is affected most significantly.
Risk Factors for Dry Eye
Dry eye may occur at any age, but certain characteristics increase the likelihood of developing the condition. Changes in tear production and eyelid gland function may develop with advancing age. Hormonal changes, particularly during menopause, may affect the balance of the tear film. Prolonged screen use may increase evaporation by reducing blinking frequency. Contact lens use may also make ocular surface symptoms more pronounced in some people. Environments with low humidity, wind or intensive air conditioning may increase existing symptoms.
The main factors that may contribute to dry eye include:
- Advanced age.
- Hormonal changes.
- Menopause.
- Prolonged screen use.
- Contact lens use.
- Dry and windy environments.
- Intensive use of air conditioning or heating.
- Certain systemic diseases.
- Eyelid and oil gland problems.
The presence of risk factors does not mean that every person will develop dry eye syndrome. However, the presence of multiple factors may cause symptoms to become more pronounced. For example, tears may evaporate more quickly in someone who uses screens for long periods and works in an air-conditioned environment. If contact lens use is also involved, ocular surface discomfort may increase. Daily habits are therefore considered alongside the eye examination during assessment. Adjusting environmental conditions is an important part of the treatment plan.
Causes of Dry Eye Syndrome
The causes of dry eye syndrome are mainly divided into reduced tear production and rapid tear evaporation. Both mechanisms may be present at the same time in some patients. Reduced tear production may be associated with ageing or diseases affecting the tear glands. Rapid evaporation is most commonly caused by inadequate function of the oil glands along the eyelid margins. Incomplete eyelid closure, environmental conditions and contact lens use may also contribute to the condition. Identifying the cause is important for selecting appropriate treatment.
The main factors that may cause dry eye include:
- Reduced tear production.
- Rapid tear evaporation.
- Meibomian gland dysfunction.
- Rheumatic or autoimmune diseases.
- Certain systemic medications.
- Structural eyelid abnormalities.
- Prolonged screen use.
- Low-humidity environmental conditions.
Aqueous-Deficient Dry Eye
In aqueous-deficient dry eye, the tear glands cannot produce enough fluid to meet the needs of the ocular surface. Advanced age, diseases affecting the tear glands and certain previous infections may contribute to this condition. Autoimmune diseases such as Sjögren's syndrome may affect the function of the tear and salivary glands. Dry eye may therefore be accompanied by other symptoms such as dry mouth. Certain allergy medications, antidepressants, diuretics and various systemic treatments may reduce tear production. The effect of medications varies from person to person.
Medications thought to contribute to dry eye should not be discontinued based on the patient's own decision. When necessary, the treatment is assessed together with the physician who prescribed it. The degree of tear production can be examined through an eye examination and appropriate tests. Severe aqueous deficiency may require supportive treatments that protect the ocular surface. If an underlying autoimmune disease is present, monitoring in collaboration with the relevant specialties may be necessary. Treatment is planned according to the degree of ocular surface damage and accompanying health conditions.
Evaporative Dry Eye
In evaporative dry eye, tears are produced but cannot remain on the ocular surface for a sufficient length of time. One of the common causes is dysfunction of the meibomian glands in the eyelids. These glands contribute to the lipid component on the outer surface of the tear film. When lipid secretion decreases or the gland openings become blocked, tears may evaporate more quickly. Prolonged screen use, wind and airflow from air conditioning may make this process more pronounced. Incomplete eyelid closure may also increase dryness in some people.
Problems affecting the meibomian glands may be accompanied by redness along the eyelid margins, deposits at the base of the eyelashes and burning in the eyes. Blepharitis and certain skin conditions may accompany this problem. The structure of the eyelids and the characteristics of the gland secretions are assessed during the examination. Warm compresses and eyelid hygiene are important parts of treatment for some patients. Artificial tears containing a lipid component may also be preferred in suitable cases. Treatment is determined according to the degree of gland obstruction and the condition of the ocular surface.
Symptoms of Dry Eye Syndrome
Symptoms of dry eye syndrome may vary according to the cause of the condition and its effects on the ocular surface. Burning, irritation and a foreign body sensation are the most common complaints. Some patients describe discomfort as if they have sand or dust in their eyes. Eye redness and sensitivity to light are also common symptoms. Vision may temporarily become blurred during the day and improve after blinking. Symptoms may increase following prolonged screen use or exposure to windy environments.
Symptoms that may occur with dry eye syndrome include:
- Burning in the eyes.
- Irritation and a foreign body sensation.
- Redness of the ocular surface.
- Sensitivity to light.
- Temporary blurred vision.
- Eye fatigue.
- Discomfort while wearing contact lenses.
- Watery eyes.
Symptoms may not remain at the same level throughout the day. In some people, symptoms that are milder in the morning may become more pronounced by the end of the day. Heated or air-conditioned environments may increase complaints. Focusing on a screen for long periods may reduce blinking frequency and cause the ocular surface to dry more quickly. Not every case of redness or watering is caused by dry eye syndrome. Allergic conjunctivitis, infections and other ocular surface diseases must also be considered.
Why Do Watery Eyes Occur with Dry Eye?
People with dry eye may occasionally experience excessive watering. This is associated with the reflex response of the ocular surface to irritation. Nerves stimulated by dryness may cause the tear glands to produce more fluid for a short period. Even when the amount of tears increases, the tear film may remain unbalanced. The fluid may therefore overflow before it can remain on the ocular surface. Burning and irritation may continue even while the eyes are watering.
Reflex tearing does not mean that the ocular surface is adequately protected. Not only the quantity of tears but also their composition and the length of time they remain on the surface are important. If there is a problem with the meibomian glands, the newly produced tears may evaporate more quickly. Eyelid margin problems or tear duct diseases may also cause watering. Persistent watery eyes should therefore be assessed for other possible problems as well as dry eye. Treatment is planned according to the underlying mechanism causing the watering.
How Is Dry Eye Diagnosed?
The patient's symptoms and ocular surface examination are evaluated together when diagnosing dry eye syndrome. The patient is asked when the symptoms increase, how frequently screens and contact lenses are used and which medications are being taken. The amount of tears and how long the tear film remains on the surface may be examined using appropriate tests. Special dyes may be used to assess damage to the cornea and conjunctiva. The eyelid margins and condition of the meibomian glands are also important parts of the examination. Diagnosis is not based on a single test result but on the assessment of all clinical findings together.
Methods that may be used during diagnosis include:
- Schirmer test.
- Tear break-up time measurement.
- Corneal and conjunctival staining tests.
- Meibography.
- Eyelid margin examination.
- Assessment of meibomian gland secretions.
During the Schirmer test, the amount of moisture absorbed within a specified period by a special paper strip placed inside the lower eyelid is measured. This test may provide information about tear production but does not demonstrate every type of dry eye on its own. Tear break-up time helps assess how long the tear film remains stable on the ocular surface. Meibography may be used to visualise the structure of the oil glands within the eyelids. Ocular surface staining tests help identify damaged areas of the cornea or conjunctiva. The tests used are selected according to the person's symptoms and examination findings.
Measures That Can Be Taken in Daily Life
When planning dry eye syndrome treatment, it is important to review daily habits and environmental conditions. Taking regular breaks may help relieve the ocular surface in people who spend long periods in front of screens. Consciously blinking more frequently while looking at a screen may also be helpful. Airflow from air conditioning or heaters should not be directed towards the face. Maintaining an appropriate humidity level indoors may reduce symptoms. Wearing protective glasses in windy conditions may help limit tear evaporation.
Measures that may be considered in daily life include:
- Taking regular breaks from screen use.
- Developing the habit of blinking consciously.
- Avoiding direct airflow from air conditioning and fans.
- Maintaining appropriate humidity indoors.
- Wearing protective glasses in windy conditions.
- Assessing the duration of contact lens use.
- Maintaining eyelid hygiene.
Positioning the computer screen slightly below eye level may help reduce ocular surface exposure in some people. Regular screen breaks may be particularly beneficial during intensive digital work. A balanced diet is important for general health, but no single food is expected to treat dry eye syndrome on its own. Foods containing omega-3 may form part of some people's diets. However, omega-3 supplements cannot be said to provide the same benefit for every patient with dry eye. Supplement use should be assessed by considering the person's health and medications.
Use of Artificial Tears
Artificial tears are among the main treatment options used to support moisturisation of the ocular surface. The contents of the drops may vary according to the type of tear deficiency. Thicker gels may be considered particularly for patients with pronounced dryness. Products containing a lipid component may be preferred for evaporative dry eye. Frequency of use is determined according to the patient's symptoms and ocular surface findings. Not every artificial tear preparation is equally suitable for every patient.
Preservative-free options may be considered for patients who need to use eye drops frequently. These products may be more suitable for people with pronounced ocular surface sensitivity. It cannot be said that all preserved eye drops are harmful to every patient. However, when intensive and long-term use is required, it is important to select the product according to the condition of the ocular surface. Thick gels or ointments used at night may cause temporary blurred vision. Their timing should therefore be planned according to daily needs.
Anti-Inflammatory Eye Drop Treatments
Artificial tears alone may not be sufficient for patients with pronounced ocular surface inflammation. Eye drops intended to reduce inflammation may be considered in this situation. Some treatments help regulate the immune response on the ocular surface. Regular use for a certain period may be required before their effects become apparent. Short-term corticosteroid eye drop treatment may also be planned for suitable patients. However, drops containing corticosteroids should not be used without medical supervision because of risks such as increased intraocular pressure and infection.
Different medications may be added to the treatment plan if eyelid margin inflammation or signs of infection are present. Antibiotic drops are not necessary for every patient with dry eye. Medication is selected according to the ocular surface findings and accompanying eyelid problems. Eye drops prescribed for another person should not be used. Follow-up examinations should be planned for patients requiring long-term treatment. The duration and content of treatment may be reassessed according to the response of the ocular surface.
Warm Compresses and Eyelid Care
Warm compresses may be a supportive part of treatment for patients with meibomian gland dysfunction. A compress at an appropriate temperature may help soften thickened lipid secretions inside the eyelids. Gentle eyelid massage performed as recommended may then help the gland secretions flow out. Excessive pressure should not be applied to the eyelids during the procedure. Using excessively hot materials may cause skin burns and irritation. The frequency and method of eyelid care are determined according to the condition of the eyelids.
Removing deposits from the base of the eyelashes may help reduce symptoms in some patients. Eyelid hygiene becomes more important when blepharitis is present. However, the same cleansing product or care frequency is not recommended for every patient. The potential for products to cause irritation must be considered in people with sensitive skin. Eyelid care is not a stand-alone solution that replaces eye drops and other treatments. When regular application is required, it is considered part of the treatment plan.
Advanced Dry Eye Treatments
Environmental adjustments, artificial tears and eyelid care may not be sufficient for some patients. More advanced treatment methods may then be considered. The method selected varies according to the type of tear deficiency and its effects on the cornea. Device-assisted treatments targeting the oil glands in the eyelids may be used in some patients. Tear duct plugs may help existing tears remain on the ocular surface for longer. Autologous serum or biological tissue procedures may be considered in more severe cases.
Advanced treatment options may include:
- Intense pulsed light treatments.
- Thermal eyelid treatments.
- Tear duct plugs.
- Autologous serum eye drops.
- Amniotic membrane procedures.
- Special contact lenses that protect the ocular surface.
Not all these methods are used in every patient. Suitability is determined according to the type of underlying condition and the degree of ocular surface damage. Some procedures may need to be performed over multiple sessions. Artificial tears or eyelid care may still be continued after treatment. Advanced treatments should not be expected to eliminate dry eye completely in every patient. The purpose is to control the symptoms and protect the ocular surface.
Light and Thermal Treatments
Intense pulsed light treatments may be considered for treating meibomian gland problems in certain patients. During this method, controlled light is applied to the skin around the eyes. The aim is to help reduce inflammation along the eyelid margins and oil gland dysfunction. Suitability for the procedure varies according to skin characteristics, eyelid structure and accompanying conditions. The eyes must be protected appropriately during the procedure. Intense pulsed light treatment is not suitable for every patient with dry eye.
Thermal treatment systems may apply controlled heat to the eyelids. Some devices also combine heat with gentle pressure or massage. These procedures aim to soften thickened lipid secretions and support the emptying of the glands. The effects may vary from patient to patient. Some people may require additional sessions or continued use of other treatments. The method is selected according to the gland changes detected during the examination.
Tear Duct Plugs
Tear duct plugs may be used to reduce the drainage of tears towards the nasal cavity. Suitable plugs are placed into the small tear duct openings along the eyelid margins. The purpose is to help existing tears remain on the ocular surface for longer. They may be considered particularly in some patients with reduced tear production. However, active ocular surface inflammation may need to be controlled before the procedure. Suitability for plugs is determined according to the examination findings.
Some plugs are designed for temporary use, while others are intended to remain in place for longer. Excessive watering or displacement of the plug may occur after the procedure. Irritation or infection along the eyelid margin may develop less frequently. Using plugs does not completely eliminate the need for artificial tears in every patient. The plug may be removed or the treatment plan changed when necessary. Regular follow-up helps evaluate the effect of the procedure on the ocular surface.
Autologous Serum and Biological Treatments
Autologous serum is a treatment option prepared from the patient's own blood and used in the form of eye drops. It is mainly considered for patients with pronounced ocular surface damage or those who have not responded adequately to standard treatments. The prepared serum contains various biological components that may support healing of the ocular surface. The product must be prepared and stored under appropriate conditions. The duration and frequency of use are determined according to the patient's clinical condition. Not every patient with dry eye requires autologous serum treatment.
Amniotic membrane procedures may be considered in selected patients with persistent damage to the corneal surface. This biological material may help protect the ocular surface and support the healing environment. The method and duration of application vary according to the existing tissue damage. Special contact lenses that protect the ocular surface may also be added to treatment in some patients. These methods are used for more advanced ocular surface problems and require regular monitoring. The treatment plan is prepared by considering the underlying cause and the condition of the cornea.
What Happens If Dry Eye Is Left Untreated?
If dry eye treatment is delayed, irritation and inflammation of the ocular surface may continue. Patients may experience persistent burning, irritation and fluctuations in vision. Contact lens use may become difficult, and time spent in front of screens may become more uncomfortable. Small areas of damage may develop on the corneal surface in some patients. More serious corneal problems may occur in severe cases, particularly those associated with autoimmune diseases. However, not every case of dry eye is expected to progress or become severe.
The course of the condition varies according to its cause and the treatment used. Environmental adjustments and appropriate eye drops can control symptoms in many patients. More severe cases may require additional treatments to protect the ocular surface. Assessment should not be delayed if severe pain, pronounced sensitivity to light or a sudden reduction in vision occurs. Regular follow-up helps monitor the tear balance and corneal surface. You can contact me using the details on my website to schedule an examination appointment.
