Medically termed nearsightedness or myopia is a common cause of blurred vision that can be mild, moderate, or severe. It is a type of refractive error of the eye. If you are nearsighted, you have trouble seeing things that are far away and out of focus. This occurs when the physical length of the eye is greater than the optical length which is difficult for the eyes to focus light directly on the retina. If the light rays are not clearly focused on the retina, the images you see may be blurry.
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