Dry eyes 101

Updated: May 1, 2019

The eye is naturally coated by a surface of tears that helps to maintain clear vision and prevent infection. If there is a disruption in tear quality and/or quantity, the eye isn’t adequately lubricated and inflammation can occur. Dry eye is a chronic condition that occurs when there is inflammation on the front surface of the eye.

What causes it?

There are 3 tear layers:

1. Mucin (innermost) layer allows tears to spread evenly

2. Aqueous (middle) is the water layer and supplies lubrication and nourishment to the cornea and conjunctiva

3. Lipid (outermost) is the oil layer that prevents evaporation