The eye transforms an image of an object reflected on the retina into electrochemical information and delivers it to the brain through the optic nerve. The eye receives information more than any other senses of the body. It is so important that people say, “Eyes take 90% of the body.” However, it is very sensitive to external stimuli, so even a small dust particle can cause great inconvenience. This is why the eyeball, the main organ of the eye, is assisted by many appendages.
First, the eyelid covers the exposed eyeball and protects it, moving up and down and washing the eye with tears to make it shiny and transparent. When it is exposed to wind or strong light, it is automatically closed and reduces discomfort on the eye. Eyelashes on the eyelids detect foreign objects, block them from reaching the eye, and prevent invasion of bacteria and fine particles. In addition, the eyebrows stop the sweat running on the forehead from getting into the eye, and the eyebrow bone absorbs the shock when the eye is shocked physically.
Eyelids, eyelashes, eyebrows, and eyebrow bones are indispensable helpers, though they are not directly concerned in the sense of vision. No matter how small it may seem, every organ that makes up the body has a role and a mission, and there is a reason for its existence.