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Ophthalmology – Dry Eye Syndrome (Keratoconjunctivitis Sicca)
Dry eye syndrome is a multifactorial disease of the ocular surface characterized by an unstable or insufficient tear film, leading to discomfort, visual disturbance, and potential damage to the cornea and conjunctiva. It is broadly classified into three main types: aqueous tear-deficient, evaporative, and exposure-related dry eye. The condition may occur as an isolated ocular disorder or as part of systemic diseases such as autoimmune conditions.
This is a very common condition, particularly in older adults and females. Prevalence increases with age, affecting up to 19% of individuals over 80 years. Risk factors include aging, female sex, ocular surgeries (such as LASIK or cataract surgery), diabetes, and contact lens use. Environmental factors like low humidity and prolonged screen use also contribute significantly.
The pathophysiology involves tear film instability and ocular surface desiccation, which leads to inflammation, loss of goblet cells, and epithelial damage. Over time, this can result in keratinization and chronic surface changes. In aqueous deficiency, there is reduced tear production, whereas evaporative dry eye is usually due to meibomian gland dysfunction, causing rapid tear evaporation. Exposure-related dry eye results from incomplete eyelid closure or reduced blinking.
Patients commonly report burning, itching, gritty sensation, foreign body sensation, and intermittent blurred vision, especially with prolonged visual tasks like reading or computer use. Symptoms often worsen in dry, windy, or air-conditioned environments and improve in humid conditions. Some patients paradoxically experience excess tearing, which is a reflex response to irritation.
On examination, findings may include conjunctival redness, reduced tear meniscus, and superficial punctate keratitis in exposed areas of the cornea. In evaporative dry eye, signs of meibomian gland dysfunction such as thickened secretions, lid margin inflammation, and foamy tear film may be present. Severe cases may show filamentary keratitis or epithelial defects.
Diagnosis is supported by clinical tests. The Schirmer test measures tear production, with low values indicating aqueous deficiency. The tear breakup time (TBUT) assesses tear film stability, with values less than 10 seconds suggesting evaporative dry eye. Rose Bengal staining highlights damaged or devitalized epithelial cells and helps assess severity.
Management is stepwise and depends on severity and type. First-line treatment includes artificial tears, gels, and ointments to supplement and preserve moisture. Environmental modifications such as using humidifiers and avoiding irritants are also important. For evaporative causes, warm compresses and lid hygiene are essential, and oral doxycycline or omega-3 supplements may be beneficial.
Second-line therapies include topical cyclosporine, autologous serum eye drops, and systemic secretagogues such as pilocarpine or cevimeline in selected cases. In more severe disease, procedures such as punctal plugs or punctal occlusion help retain tears. For exposure-related cases, interventions like lid taping, moisture chambers, or surgical options (e.g., tarsorrhaphy) may be required.
Patients should be advised to stay hydrated, blink frequently during screen use, and avoid dry environments. Referral to a specialist is indicated if systemic conditions like Sjögren’s syndrome are suspected.
The prognosis is generally excellent, with most patients achieving good symptom control with appropriate therapy. However, untreated or severe cases can lead to complications such as filamentary keratitis, corneal ulceration, or rarely corneal perforation, highlighting the importance of early recognition and management.
Dry eye syndrome is a multifactorial disease of the ocular surface characterized by an unstable or insufficient tear film, leading to discomfort, visual disturbance, and potential damage to the cornea and conjunctiva. It is broadly classified into three main types: aqueous tear-deficient, evaporative, and exposure-related dry eye. The condition may occur as an isolated ocular disorder or as part of systemic diseases such as autoimmune conditions.
This is a very common condition, particularly in older adults and females. Prevalence increases with age, affecting up to 19% of individuals over 80 years. Risk factors include aging, female sex, ocular surgeries (such as LASIK or cataract surgery), diabetes, and contact lens use. Environmental factors like low humidity and prolonged screen use also contribute significantly.
The pathophysiology involves tear film instability and ocular surface desiccation, which leads to inflammation, loss of goblet cells, and epithelial damage. Over time, this can result in keratinization and chronic surface changes. In aqueous deficiency, there is reduced tear production, whereas evaporative dry eye is usually due to meibomian gland dysfunction, causing rapid tear evaporation. Exposure-related dry eye results from incomplete eyelid closure or reduced blinking.
Patients commonly report burning, itching, gritty sensation, foreign body sensation, and intermittent blurred vision, especially with prolonged visual tasks like reading or computer use. Symptoms often worsen in dry, windy, or air-conditioned environments and improve in humid conditions. Some patients paradoxically experience excess tearing, which is a reflex response to irritation.
On examination, findings may include conjunctival redness, reduced tear meniscus, and superficial punctate keratitis in exposed areas of the cornea. In evaporative dry eye, signs of meibomian gland dysfunction such as thickened secretions, lid margin inflammation, and foamy tear film may be present. Severe cases may show filamentary keratitis or epithelial defects.
Diagnosis is supported by clinical tests. The Schirmer test measures tear production, with low values indicating aqueous deficiency. The tear breakup time (TBUT) assesses tear film stability, with values less than 10 seconds suggesting evaporative dry eye. Rose Bengal staining highlights damaged or devitalized epithelial cells and helps assess severity.
Management is stepwise and depends on severity and type. First-line treatment includes artificial tears, gels, and ointments to supplement and preserve moisture. Environmental modifications such as using humidifiers and avoiding irritants are also important. For evaporative causes, warm compresses and lid hygiene are essential, and oral doxycycline or omega-3 supplements may be beneficial.
Second-line therapies include topical cyclosporine, autologous serum eye drops, and systemic secretagogues such as pilocarpine or cevimeline in selected cases. In more severe disease, procedures such as punctal plugs or punctal occlusion help retain tears. For exposure-related cases, interventions like lid taping, moisture chambers, or surgical options (e.g., tarsorrhaphy) may be required.
Patients should be advised to stay hydrated, blink frequently during screen use, and avoid dry environments. Referral to a specialist is indicated if systemic conditions like Sjögren’s syndrome are suspected.
The prognosis is generally excellent, with most patients achieving good symptom control with appropriate therapy. However, untreated or severe cases can lead to complications such as filamentary keratitis, corneal ulceration, or rarely corneal perforation, highlighting the importance of early recognition and management.
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