Children with postoperative congenital cataract are not fitted with IOLs until they are 2 years old because their eyes are still developing rapidly, so they need to wear glasses after surgery to improve their vision. However, because of the thick and heavy highly hyperopic lenses and the distortion of peripheral vision, especially in children with monocular cataracts and aphakic eyes, it is difficult to establish binocular stereopsis due to the severe refractive aberration in both eyes, and it is also difficult to avoid nystagmus, strabismus and monocular amblyopia. Clinical practice has proved that RGP can safely and effectively correct post-operative aphakia in infants and children, and buy time and lay a good foundation for IOL implantation, restoration and establishment of binocular vision in the future. In addition, studies have shown that RGP for children with nystagmus can effectively suppress the amplitude and frequency of nystagmus and improve the visual quality of the children to a certain extent. How old is a baby for RGP? RGP has high oxygen permeability and good wearing comfort, so there is no strict age limit, but for children of different ages due to the degree of cooperation and compliance and many other issues, whether they can wear RGP needs to be personalized, the following are a few experiences: 1, from birth to 3 months of age, infants and children, because their macula development has not yet been perfect, macular gaze has not yet formed, infant corneal diameter and lid fissure is too small. 2. Children between 3 months and 2 years old are the prime age for RGP fitting, mainly because of the degree of cooperation and compliance, and because RGP is the best choice for children within 2 years old who rarely have IOLs implanted after cataract surgery. 4. From 3 to 6 years of age, most of the cases fail because of the degree of cooperation, and even if the fitting is successful, more than half of them discontinue wearing the lens because of the high rate of lens loss; 5. The success rate of RGP fitting increases significantly above 6 years of age, but most of the cases are out of indication for various reasons, such as aphakia after cataract surgery, because of the option of IOL implantation; ocular However, most of the cases are out of the indications because of various reasons, such as aphakia after cataract surgery, which can be treated by IOL implantation, and tremor. The process of RGP fitting: 1. medical history 2. full communication 3. eye examination 4. pupil dilatation 5. corneal curvature examination 6. selection of lens base arc 7. RGP fitting and trial evaluation 8. lens booking 9. lens removal and training for parents and wearers The process of RGP fitting for parents and patients 1. Parents should be able to contact the hospital in time for any situation during the correction process; they should understand the problems that may occur during the correction process and be able to accept and actively cooperate; 2. Parents should clearly know the importance of adherence and be able to actively review as required. 3. Infants and children with aphakia should pay attention to the dilated pupil examination every 3 months, if the refractive error changes a lot, the lenses need to be replaced; other cases every 6 months or depending on the condition, the time of dilated pupil examination.