Causes of Dry Eye
People usually begin experiencing dry eye symptoms as they age, but the condition can also result from certain medications, conditions or injuries. Dry eye tends to affect women more often than men, due to the hormonal changes that take place during pregnancy or menopause. Oral contraceptives can also affect the consistency of tears. Dry eye is more common in people over the age of 50. Other causes of dry eye may include:
- Medication such as antihistamines, decongestants, blood pressure medication and antidepressants
- Medical conditions such as rheumatoid arthritis and diabetes
- Environmental conditions such as smoke, wind, air conditioning and dry climates
- Long-term contact lens use
- Eye surgery
- Sun exposure
- Smoking or second-hand exposure to smoke exposure
- Sjogren’s syndrome
- Thyroid eye disease
- An eye injury
- Eyelid surgery
- Inflammation of the conjunctiva
- Exposure keratitis
These factors can affect the frequency or consistency of tears, both of which can lead to dry eyes. Our natural tears require a certain chemical balance in order to efficiently moisturize the eyes.
Another common contributor to dry eye symptoms is Demodex, which is a microscopic mite that causes refractory blepharitis. Specialists are advising that in any type of ocular inflammation due to refractory condition, Demodex should be considered as a possible causative factor.
Common symptoms of Demodex is early morning itching and irritation of the eyes – the mites have a severe aversion to light, so they come out at night to mate and lay eggs on the lashes, then crawl back into the follicle when the sun comes out, which is causes the itching.
A frequent treatment used is tea tree oil, which can be bought at most health food stores. Because of the strength of tea tree oil, it’s best to cut the oil to 50% in another carrier oil, such as coconut or macadamia nut oil, and apply with a cotton swab. Another treatment for these mites is Blephedex, which is used and sold at North Toronto Eye Care as a viable treatment option.