Patient’s description (time of onset, main symptoms, hospital visited, etc.): At the end of 2008, I found that my child’s vision was not good, and I was examined at the local hospital and found that the congenital crystal was subluxated. The doctor said that the child was too young to be cured, so she should be fitted with glasses first. She has been fitted with glasses once every six months, but her vision has been decreasing from 0.2 and 0.3 to 0.1 and 0.15, and the glasses can only be adjusted to 0.4 and 0.5. Can my child have surgery for this condition? How much will it affect his vision development? Where can I have this surgery? When is the best time to operate? Is it risky? Pang Lin, Strabismus and Pediatric Ophthalmology Department, Peking University First Hospital: We need to see the degree of crystal skew, if the crystal edge is dislocated to the pupil area, surgery is needed, or if the refractive error is not well corrected and the vision is too poor, surgery is also possible. The main problem of surgery is the complexity of operation, unlike ordinary cataract surgery, it is difficult to fix the IOL, and the more serious the crystal deviation, the greater the risk of surgery. What needs to be observed for a long time after surgery is the condition of IOP, vision and fundus, and the relatively bigger risk is glaucoma and fundus disease. But most of this disease is a progressive disease, and without treatment vision will get worse.