Tears are made of water, oil and mucus. They function to lubricate the eyeball. There are many different causes of Dry Eye, including:
• Age: As we age, our eyes produce fewer tears. This is why Dry Eye is more common in older adults.
• Gender: Women are more likely to suffer from Dry Eye than men, due to hormonal changes during menopause.
• Medications: Certain medications can decrease the production of tears, or make the tears evaporate more quickly. These include antihistamines, decongestants, blood pressure drugs like beta blockers, oral contraceptives, and antidepressants.
• Medical conditions: Inflamed eyelid glands that become clogged with oil cause blepharitis (inflammation of the eyelids), and eye mites accumulate in the oil glands and are common with Acne Rosacea and other skin conditions. Dry Eye can also be a symptom of other medical conditions, such as Parkinson’s, Sjögren’s syndrome, rheumatoid arthritis, lupus, diabetes, thyroid disease, and vitamin A deficiency.
• Meibomian gland dysfunction (MGD): When the meibomian oil glands in the eyelids become blocked and unable to produce tear film that covers the eyeball, it is called MGD. MGD is believed to be the leading cause of Dry Eye Disease; and is especially important for patients who need cataract surgery or refractive surgery (Lasik and other forms of refractive surgery). Treatment of MGD is vital to the outcome of any surgical procedure. Optimizing eye health is key to a good surgical outcome.
• Environmental factors: Dry Eye can be caused by wind, smoke, and dry air. This is why it is more common in places with low humidity, heat, and cold weather, such as deserts or high altitudes.
• Eye surgery and corneal damage: caused by contact lens use, corneal nerve damage and laser eye surgery can temporarily induce or exacerbate Dry Eye Disease and worsen vision, increase symptoms, and impact the outcome of eye surgery.
• Lifestyle conditions: smoking, less blinking while reading, driving, doing computer work, preservatives in eye drops, and diets low in omega 3 fatty acids and vitamin D can lead to Dry Eye.