Myopia or Nearsightedness is one defect of the eye. (A person sees near objects clearly while distant objects appear blurred)

Light from a distant object forms an image before it reaches the retina. This could be because the eye is too long, or the cornea or crystalline lens is too strong.

Let see in figure-

Myopia is corrected by using a concave (diverging) lens of appropriate power. Property of concave lens is to divert the light which helps in forming an image on the retina.