After dislocation, the most direct symptom is blurred vision. It is easy to understand how a camera lens will look like if it is skewed. The common clinical causes of crystal dislocation are: 1. Congenital crystal dislocation: It is usually found in children, and more careful parents can find it when the child is about 2 years old, although at this time the child is too young and the eye development is far from complete, so surgery is not generally advocated, but it is still necessary to hold to see the doctor, and it may be necessary to take measures of prescription lenses to try to correct the obvious astigmatism and amblyopia first. Parents should be reminded that this surgery is not a simple routine cataract surgery, but requires treatment of the vitreous and examination of the retina, and the IOL often needs to be sutured rather than simply implanted, so it is often necessary to consult a doctor who can perform vitreoretinal surgery. 2. Traumatic lens dislocation: Various kinds of eye trauma can cause it, such as boxing, car accidents, and various blunt force blows, etc. Unless the injury is relatively minor and the visual impact is small, no surgery can be done. Others, such as lens dislocation that can obviously be detected and has significantly affected vision, generally require surgical treatment. Patients are generally more concerned about whether the lens can be “fitted” during surgery, because the damage caused by trauma is usually complex and different for each individual. Therefore, the decision of whether and how to “fit” the lens should be made after seeing the surgeon. This type of patient usually needs to be seen by a surgeon who specializes in ocular trauma.