The Eye

The eye is a sensory organ found in most living creatures. The simplest of eyes can be used just to tell if the surrounding area is light or dark, whereas the more complex grants the sense of vision. Light is what allows us to see. The human's eye works differently than some others. It projects light to the retina, which depicts the image and precieves it into the true image that is there. It is typically spherical (unless there is some problem) and has a liquid, informally called eye jelly. It contains a muscle called the iris, which expands and contracts to allow a certain comfortable amount of light to pass through the pupil. The human eyes are placed in the front of the head, allowing only forward sight. A horse's eyes, among others, are placed on the side of the head, allowing a much wider range of sight, but not 4 feet in front. The horse must rear up to see what's in front of them, but can see very well on the sides. A human's eyes are uniocular, meaning they see only one image that the brain can precieve. A horse's eyes are bincular, allowing them to precieve the image taken by both eyes. The human eyes can turn towards each other to see a certain object to look like it is one thing. They can diverge from each other to see something farther away. This is often called cross-eyed viewing. Have you ever gone cross-eyed from reading too long? That's because the muscles get so used to looking close that it takes time for them to relax. Just like when you're working out. Your bisceps start to stay tensed for a short period of time. There are 2 types of light viewing molecules in your eyes. Rods and Cones. Rods are responsible for low light vision and black and white vision. Cones are responsible for high light vision and colored vision. The eyes are wonderous things in which allow us to survive. Thank them for being your friend, as they will do anything to keep you alive!