02. Excessive tear evaporation:
- Environmental factors: Strong winds, dry air, and smoking can contribute to tear evaporation.
- Blinking frequency: Reduced blinking during activities that require high concentration, such as reading, driving, or prolonged computer use, can lead to excessive tear evaporation.
- Eyelid diseases: Conditions like ectropion or entropion.
03. Abnormal tear composition:
- Any abnormalities in the three basic components of tears (water, lipids, mucin) can lead to dry eye. For example, meibomian gland blockage can result in abnormal lipid secretion.
