Answered from cited sources · retrieved September 20, 2026
why do eyes get dry
Eyes get dry when they do not produce enough tears or when tears evaporate too quickly to keep the eye surface lubricated.
Dry eye occurs when the tear film—which consists of oil, water, and mucus—fails to properly lubricate the eye. This happens if the eyes do not produce enough tears (aqueous-deficient) or if tears evaporate too quickly (evaporative). Often, these issues occur together. Factors such as aging, hormonal changes, certain medications, environmental conditions, and underlying health issues like autoimmune diseases can disrupt the tear film's stability, leading to inflammation and discomfort.
- Insufficient tear production. Aqueous-deficient dry eye happens when the lacrimal glands do not produce enough of the watery component of tears, often due to aging, autoimmune conditions like Sjögren’s syndrome, or certain medications.
- Rapid tear evaporation. Evaporative dry eye occurs when tears disappear too fast, frequently caused by meibomian gland dysfunction, where the oil-producing glands in the eyelids become clogged or fail to provide the protective lipid layer.
- Environmental and behavioral factors. Environmental factors like wind, smoke, dry air, and low humidity can accelerate evaporation, while activities like staring at screens can reduce blinking, preventing the even distribution of tears.
- Medications and health conditions. Many medications, including antihistamines, antidepressants, and blood pressure drugs, as well as systemic health conditions like diabetes and thyroid disease, can contribute to dry eye.
Sources
- Dry Eye | National Eye Institutenei.nih.gov
- Causes of Dry Eye | National Eye Institute - NIHnei.nih.gov · published December 6, 2024
- Dry eyes - Symptoms & causesmayoclinic.org · published September 23, 2022
- Dry eye syndrome: MedlinePlus Medical Encyclopediamedlineplus.gov
- Dry Eye Syndrome - StatPearls - NCBI Bookshelfncbi.nlm.nih.gov · published February 29, 2024
- Dry Eyes: Types, Symptoms, Causes & Treatmentmy.clevelandclinic.org
- What Is Dry Eye? Symptoms, Causes and Treatmentaao.org · published December 8, 2025
- Keratoconjunctivitis Sicca - Ophthalmology - Merck Manual Professional Editionmerckmanuals.com · published June 9, 2026
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