please dont actually read all this its all just copied and pasted from a optometery web site (ikik you think im a genius) How to use your eyes: Step 1: Light enters the eye through the cornea When we look at an object, the light that is reflected off of the object enters the eye through the clear front layer of the eye, called the cornea. The cornea bends the light before it passes through a watery substance that fills the area behind the cornea, called the aqueous humor. Step 2: The pupil adjusts in response to the light The light continues to travel through the black opening in the center of the iris, called the pupil. The iris is the colorful part of your eye that gives it its blue, green, hazel, brown or dark appearance. The pupil then automatically gets bigger or smaller, depending on the intensity of the light. How does the pupil expand and contract? The iris is actually made up of muscles that expand and contract to control the pupil and adjust its size. So when you see your pupil getting bigger or smaller, it is really the iris that is controlling the pupil opening in response to the intensity of light entering the eye. Step 3: The lens focuses the light onto the retina The light passes through the pupil to the lens behind it. The lens adjusts its shape to bend and focus the light a second time, to ensure that you have a clear image of what you are looking at. At this point, the light has been bent twice— as it moved from the cornea through the lens, and then from the lens to the retina. This “double bending” has actually flipped the image upside down. Step 4: The light is focused onto the retina The light then passes from the lens to the back of the eye which is filled with a clear, gelatinous substance called the vitreous until it reaches the retina, the light-sensitive layer at the back of the eye. The light is then focused throughout the retina which contains nerves called photoreceptors. The photoreceptors are made up of rods and cones, and are responsible for transforming the light rays into electrical impulses. While the light is focused throughout the retina, most of the light entering the eye is focused onto the focal point on the retina, known as the macula. Step 5: The optic nerve transmits visual information to the brain The nerves of the retina collect all of the electrical impulses, which then travel through the optic nerve at the very back of the eye up to the occipital lobe in the back of the brain.
characters from madoka magica
