When you yawn you may screw up your eyes and prevent the normal diagonal flow of fluid across the eye so that it seeps out of the corners. Your facial muscles around your eyes pull tight, putting pressure on your lacrimal glands. These glands produce the watery component to natural tears. Your lacrimal glands are sited deep beneath our upper eyelids.
They produce the watery part of the eyes’ natural tears. Their function is to produce and release tears slowly throughout the day so the surface of our eyes is coated at all times. When you yawn, pull your eyes tight, and put pressure on these glands, the water is pressed out. You may notice a difference if you yawn keeping your eyes open. Try it.
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