A: Causes of dry eye include:
- Environmental factors – air conditioning, heaters, etc.
- Lifestyle factors – poor diet
- Drug side-effects (ex. with antihistamines)
- Systemic disorders – Sjogren’s syndrome, rheumatoid arthritis, and collagen vascular diseases
- Insufficient eyelid closure/blinking
- Tear-flow system imbalance
- Hormonal changes