The main causes of hyperopia are short anterior and posterior diameters of the eyeball, small curvature of the refractive plane of the eyeball, and low refractive index of the refractive interstitium. 1. In children, due to growth and development, the eye axis is not fully developed, so the anterior and posterior diameters of the eyeballs are shorter. The short anterior and posterior diameters of the eyeballs will cause farsightedness because light rays entering the eye will reach the retina before focusing and form a blurred image on the retina. 2. A small curvature of the refractive surface of the eye, such as corneal over-equality, will make the refractive power of the eye weaker, thus the refractive ability of the eye is weakened, and further symptoms of farsightedness will appear. 3. A change in the refractive index of the refractive medium of the eye can also lead to low refractive power of the eye, such as after cataract lens extraction, causing hyperopia symptoms. If you have hyperopia that affects your vision, you should go to the hospital in time and wear eyeglasses to correct your hyperopia according to the specific cause of the problem and the degree of hyperopia.