Return Home
HealthSearch
Health Guide
Multimedia Encyclopedia

The nervous system enables a person to blink to prevent harmful substances, like smoke from getting in the eyes. During the normal course of a day, a person blinks an average of 15 times a minute to keep the eyes healthy.

The lacrimal, or tear, gland provides lubricating fluid for the eyes. The eyelid moves fluid from the lacrimal gland and across the eye. Blinking also provides the eyes with protection from foreign objects.

When the eye becomes irritated, the lacrimal gland produces extra tears to wash out impurities. Excess fluid drains through the tear ducts and canal into the nasal cavity. An abundance of tears draining through the nasal cavity may cause the nose to run and a person to sniffle.

Review Date: 11/8/2023
Reviewed By: Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, CA. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.