Prove that the blink reflex can only be obtained when certain areas of the skin are irritated.

The blink reflex can be obtained when the eye or the skin near the eye is irritated. Then the eye reflexively closes, a tear begins to stand out. This happens when a foreign particle enters the eye. Then it is very difficult for us to open our eyes, tears are strongly emitted to wash out the particle and the rest. The blink reflex can be activated without irritation. When we see that something is flying in the direction of the eye, we immediately close our eyes to protect them from damage. If this reflex is artificially evoked, then it can be suppressed.