Eye blinking refers to the swift opening and closing of the eyelids, which serves to maintain moisture, protection, and cleanliness of the eyes. This action acts as a defensive reflex against irritants and bright lights, while simultaneously distributing a protective layer of tears over the eye. On average, an adult blinks approximately 14 to 17 times each minute, with this rate being lower in infants, who blink about 2 times per minute, and then increasing to around 14-17 times per minute during adolescence.
Functions of eye blinking
- Moisturizes the eye:
Blinking distributes tears, composed of water, oil, and mucus, across the surface of the eye to prevent dryness.
- Removes debris:
It helps eliminate dirt, dust, and other pollutants.
- Provides oxygen and nutrients:
The blinking action delivers oxygen and essential nutrients to the eye.
- Protects the eye:
It serves as a reflex to shield the eye from irritants and sudden movements.
Blink rate
- Average adult: 14 to 17 times per minute.
- Infants and young children: About 2 times per minute.
- Factors that affect blink rate:
- Decreases: Reading, concentrating, or anticipating danger.
- Increases: Speaking, being nervous, or experiencing irritation.
When to visit a doctor
Although excessive blinking may be a temporary response to stress or fatigue, it is crucial to seek professional advice if it persists and disrupts daily activities or is accompanied by other symptoms such as changes in vision, eye pain, or swelling. This could signify an underlying condition that necessitates diagnosis and treatment.
