is a type of refractive error, where light rays from distant objects are not focused, After being broken in the eye, on the retina (as with normal vision) but in front of it. an inconspicuous image forms on the retina, Thus myopia people have poor vision of distant objects. Three degrees of myopia are distinguished: Weak (up to 3.0 d), Mild (3.0 – 6.0 d), and high (above 6.0 d).