How does myopia and hyperopia arise?

Nearsightedness or myopia occurs when a picture in our eye is formed not on the retina, but in front of it. The cause of myopia: an eye that is too long or a lens that is too convex. Often, myopia is hereditary. With myopia, a person sees perfectly near and with difficulty in the distance.
Farsightedness – if the picture in the eye is formed behind the retina, and not on its surface. The reason for this is the narrow lens. In old age, hyperopia develops due to presbyopia – age-related changes. With farsightedness, vision in the distance is excellent, and blurry near.