Most congenital cataracts are present before and after birth or develop during childhood. Cataracts can cause blindness or amblyopia in infants and children. 22-30% of blind children have cataracts, which are a group of serious blindness-causing diseases that seriously affect the development of vision in children, and can be simple cataracts or associated with ocular and other systemic developmental abnormalities. So, how can cataract patients choose the best time for surgery? The following is an introduction to the timing of surgery for congenital cataracts. 1.For monocular congenital cataract with lens clouding located in the pupil area or bilateral visual acuity below 0.3, surgery should be performed as early as possible at the age of 2-3 years. 2.Incomplete cataract in both eyes, if the vision of both eyes is lower than 0.1 and the fundus cannot be seen, early surgery should also be sought. 3. For those with limited lens clouding, the surgery can be postponed until the age of 4-5 years old, but not later than 6 years old, otherwise it may cause irreversible amblyopia. 4. For those who have complete cataract in both eyes after birth and whose retina is not stimulated normally, which seriously affects the development of visual function, surgery should be performed as early as possible. Generally, surgery should be performed within 1-2 months after birth, and no later than 6 months. The other eye should be operated within 1 week after the first eye surgery, and the postoperative monocular masking should not exceed 1 week to prevent the occurrence of form deprivation amblyopia due to monocular masking after surgery. 5. Patients with rubella syndrome should not have premature surgery because in the early post-infection period, the rubella virus is still present in the lens, and surgery can cause iritis due to virus release, which is generally advocated at 2-4 years of age. Parents of children diagnosed with congenital cataract should bring their children for treatment in time, because infancy and childhood are critical periods for children’s vision development, and if cataracts are not treated, there is a high risk that the child will become blind. So it is important to go to the regular eye hospital for treatment early to save your child’s vision.