When you don't have perfect vision, it's not considered a life threatening or even life altering condition. It just means you need a pair of prescription glasses. It is remarkable how two pieces of clear plastic or glass mounted on a frame, work so well at restoring one of the most important of your five senses. If only other problems could be remedied so easily. How do prescription glasses work? To answer this, you need to understand how vision works.
How Eyesight Works
When light reflects off an object, it scatters in all directions. Even the reflected light from a single point on the object scatters in the same way. If this scattered light hit a photographic film, you wouldn't see a photograph of the object because the light from every point on the object's surface is spread out and "smeared" across the film. However, if you place a lens at the right distance between the object and the photographic film, scattered light from each point of the object is brought back together (focused) on the film and forms an image. You would also have to block out extraneous light. …show more content…
Scattered light from an object goes through the lens of the eye, which focuses the light and forms an image on the back surface of the eye, called the retina. The retina then sends signals of the image to the brain.
How does a lens focus light? The light passing through a convex lens, which is thick at the center and thin at the edge, always bends light rays together so that they come together at a focal point. A concave lens (thin at the center and thick at the edge) does the opposite and bends light rays outward.
How Nike Prescription Glasses Correct
How Eyesight Works
When light reflects off an object, it scatters in all directions. Even the reflected light from a single point on the object scatters in the same way. If this scattered light hit a photographic film, you wouldn't see a photograph of the object because the light from every point on the object's surface is spread out and "smeared" across the film. However, if you place a lens at the right distance between the object and the photographic film, scattered light from each point of the object is brought back together (focused) on the film and forms an image. You would also have to block out extraneous light. …show more content…
Scattered light from an object goes through the lens of the eye, which focuses the light and forms an image on the back surface of the eye, called the retina. The retina then sends signals of the image to the brain.
How does a lens focus light? The light passing through a convex lens, which is thick at the center and thin at the edge, always bends light rays together so that they come together at a focal point. A concave lens (thin at the center and thick at the edge) does the opposite and bends light rays outward.
How Nike Prescription Glasses Correct