Myopia (near-sightedness) is very common and is one of a group of eye conditions known collectively as "refractive errors." These also include hyperopia (far-sightedness) and astigmatism (distorted vision)
Myopia is the ability to clearly see objects up close but not those at a distance.
For proper eyesight, the cornea (the clear window in front of the eye) and the lens (behind the pupil) must properly focus or "refract" light onto the retina (at the back of the eye). If the length or shape of the eye is not ideal, the light may get focused too early or too late leaving a blurred image on the retina.
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