Part 1 of Essay
The is the organ of that you gives your sight. s enable people to perform tasks and to learn about the world that around them. Sight, or vision, is a rapidly occurring process that involves interaction between the the nervous system and the brain. When someone looks at an object, what he/she is really seeing is the light ....

Part 2 of Essay
.... over the , the liquid from the gland is drained into the nose through the tear duct at the inner corner of the . Heavy laughter or crying causes muscles in the upper lid to squeeze the lachrymal gland. This produces tears that flow too fast to be drained away. The lashes catch many flying particles that otherwise would enter the . As further protection, the lids automatically close when an object suddenly moves close to the . The eye is made of 3 coats, or tunics. The outermost coat consists of the cornea and ....