Farsightedness Essay

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The most common vision issues are the refractive errors, more commonly referred to as nearsightedness, farsightedness, astigmatism and presbyopia. Refractive errors occur when the shape of the eye prevents light from focusing directly on the retina. The length of the eyeball (either longer or shorter), changes in the shape of the cornea, or aging of the lens can cause refractive errors. Most people have one or more of these conditions. In these situations of refraction, the cornea and the lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye (figure 2). Refraction is the bending of light as it passes through one object to another. Vision occurs when light rays are bent (refracted) as they pass through the cornea and the lens. The light is then focused on the retina, and then the retina converts the light-rays into messages that are sent through the optic nerve to the brain. The brain after that interpret these messages into the images we see. Some of the…show more content…
Farsightedness develops in eyes that focus images behind the retina instead of on the retina, which can result in a blurred vision (figure 4). This occurs when the eyeball is too short, which prevents incoming light from focusing directly on the retina. It may also be caused by an abnormal shape of the cornea or lens. Farsightedness is kind of similar to nearsightedness, for it can affect both children and adults, and even according to a study done, about 5 to 10 % of Americans are affected by the farsightedness eyesight issue. People whose parents are farsighted may be more likely to get the condition. The symptoms of farsightedness vary from person to another, but some signs include headaches, eyestrain, squinting, and a blurry vision, especially for close

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