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Nearsightedness, or myopia, is a vision problem experienced by up to about one-third of the population. Nearsighted people have difficulty reading highway signs and seeing other objects at a distance, but can see for up-close tasks such as reading or sewing.
Nearsightedness is a very common vision condition that affects nearly 30 percent of the U.S. population. Some evidence supports the theory that nearsightedness is hereditary. There is also growing evidence that nearsightedness may be caused by the stress of too much close vision work. It normally first occurs in school-age children. Because the eye continues to grow during childhood, nearsightedness generally develops before age 20.
The eye is one of the most amazing organs in the body. To understand how artificial vision is created, it's important to know about the important role that the retina plays in how you see.Artificial retinas combine video camera and image processing functions, allowing machines to function in their environment with unprecedented autonomy, or to augment quality control, surveillance and hazard monitoring. We review several retina devices and reveal how they execute basic manipulations of the image at processing speeds well beyond the capabilities of the human eye.
Implantable Contact Lenses are used for the correction of severe short sight, long sight and astigmatism. They are similar to small contact lenses but placed inside the eye. Recovery is usually within two weeks. Refractive (clear) lens exchange (RLE or CLE) is similar to Implantable Contact Lenses - the internal lens of the eye is replaced with a tiny plastic lens of the correct strength. A multi-focus lens can used which could enable both distance and reading glasses.The eye works much like a camera; its primary function is to focus light. For the eye to see, light rays must be bent or "refracted" to meet at a single point through the cornea, the clear window at the front of the eye that provides most of the focusing power. Light then travels through the lens, where it is fine-tuned to focus properly on the retina, the nerve layer that lines the back of the eye and connects to the brain. The retina acts like the film in a camera, and clear vision is achieved only if light from an object is precisely focused onto it. If the light focuses either in front of or behind the retina, the image you see is blurred. A refractive error means that the shape of eye structures does not properly bend the light for focusing.