Question

what are defect of eys ? how can these cured

Answer 1

Defects of the eye: Myopia: (nearsightedness) This is a defect of vision in which far objects appear blurred but near objects are seen clearly. The image is focused in front of the retina rather than on it usually because the eyeball is too long or the refractive power of the eye's lens too strong.

Answer 2

Refer to wikipedia for simple and good answwer