It is a very common situation that the degrees of the two eyes are not the same, and the degrees of the eyes can be divided into myopia, astigmatism, hyperopia, etc. All three cases may have inconsistent degrees in both eyes, and the common reasons are the following: 2. caused by the incomplete symmetry of the development of both eyes, the formation of the degree and the corneal curvature, the refractive power of the lens, the length of the eye axis, etc., usually the above indicators of the two eyes The development of the above indicators of the two eyes will be slightly different, resulting in a certain difference between the two eyes, but the difference is not too big, usually within 100 degrees. 2, caused by the use of one eye for a long time, for example, some patients like to lie in bed to read, when lying on their sides, only use one eye to see things, which leads to frequent use of the eye’s gradient growth too fast, so that the gradient of the two eyes are not consistent. 3, due to trauma to the single eye, the cornea The trauma will affect the curvature of the cornea, which will cause the difference in the prescription of both eyes.