Myopia nearsightedness is the most common vision condition in which close objects see clearly, but objects farther away appear blurred.
Nearsighted occurs if the eyeball is too long or the cornea has too-much curvature. As a result, the light entering the eye not focus correctly, and so distant objects look blurred.
It is estimated that nearsightedness affecting nearly 30 percent of the population. Some research supports the theory that nearsightedness is hereditary. There is also growing evidence that it is the influence by the visual stress of too much close work.
Nearsightedness is due to light entering the eye is focusing incorrectly, making the distant objects appear blurred while the nearer object appears clearer. Nearsightedness is a type of refractive error of the eye.
Generally, nearsighted first occurs in school-age children. Because the eye continues to grow during childhood, it typically progresses until about age 20. However, nearsighted may also develop in adults due to visual stress or health conditions such as diabetes. Nearsightedness may progress gradually or sometimes rapidly, it is often worsen during childhood and adolescence. Nearsightedness tends to run in families.