The cornea and lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye.
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Common vision problems
The most common vision problems are refractive errors, more commonly known 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.
The cornea and lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye.
The cornea and lens bend (refract) incoming light rays so they focus precisely on the retina at the back of the eye.
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Refraction is the bending of light as it passes through one object to another. Vision occurs when light rays are bent (refracted) as they pa...