The refractive state of the eye changes rapidly after cataract surgery in children. As the eye develops, the physiological hyperopia gradually decreases and the refractive power gradually develops in the direction of myopia, a phenomenon called “myopic drift. There are three theories on the mechanism of “myopic drift”: a. Imbalance in the evolution of the three refractive factors The ortho-optic process of the refractive state of the normal eye is the result of a balance between the length of the eye axis, the refractive power of the cornea and the refractive power of the crystal, and after the cataract is removed in early childhood, the refractive power of the crystal decreases and no longer affects the growth and development of myopia. After cataract removal in early childhood, the refractive power of the lens decreases and no longer counteracts the myopia caused by the lengthening of the eye axis during growth and development, thus producing myopic drift. Due to the optical amplification of IOLs, IOL implants with high-degree IOLs are more likely to produce myopic drift than low-degree IOLs. Abnormal eye development Children’s eye development is regulated by both genetic and environmental factors. Children with congenital cataracts are more susceptible than normal eyes to a variety of complex factors in the environment, such as; IOL implantation, form deprivation amblyopia, age of the child at surgery, and high postoperative intraocular pressure, which alter the normal developmental process of the eye.