When you blink or blink your eyes or your eyes blink, you shut and open your eyes quickly. (as defined by the Oxford English Dictionary).
You have every reason to blink, and not a single reason not to. Because…
Blinking protects the eyes. The eyelashes, the eyelids and the eyebrows all serve as protective barriers against entry of foreign objects intro the eye.
Blinking clear debris from the ocular surface. These can be in form of cellular debris, dried tears and even particles from the wind.
It helps prevent eye infections by removing all bacteria and dust particles on the eyes. Thus ensuring you do not get any kind of infection.
Eye batting smooths the optical surfaces, hence, clearing and brightening the image received on the retina. (Analogous of the car windshield).
It does provide nutrients to the eyes. The fresh tears flushed over the ocular surface brings nutrients, proteins and other substances to the surface cells keeping them healthy, thus literally feeding the eyes. The moisture also provides oxygen to the eyes.
When you blink you moisturize your eyes. The tears add a tiny layer of moisture on the eye surface. This helps prevent the eyes from drying out, hence, alleviating irritation and staining of the eyes.
Since it does involve muscle action, it helps in the relaxation of facial muscles and the forehead. In so doing, it counters the tendency of furling your brows and creating tension.
Frequent blinking at the rate of once in every four seconds is considered normal. However, excessive blinking may be an indication for:-
Something stuck in the eyes.
Stress or fatigue.
Some form of allergy.
Trouble in the nervous system.
Disease, for example, Parkinson’s.
‘It is no secret… man was meant to blink! Not only was he meant to blink, he was meant to blink in a particular way and at a particular frequency that ensures the renewal and revitalization of the front surface of the cornea, the epithelium and the conjuctiva.”