The lens is an important refractive medium for the human eye, acting similarly to the lens of a camera to focus light and create a clear image. Lens dislocation is a condition in which the lens becomes eccentric and tilted due to a lesion in the lens’ anchoring device, the suspensory ligament. Congenital lens dislocations are most often found in children and are often symmetrical in both eyes, progressive in development, and have a genetic predisposition. Lens dislocation may occur alone or in combination with other abnormalities of the eye, such as microspherical lens, iris defect, and retinal detachment. In syndromes such as Marfon syndrome, homocystinuria, and Marchesani syndrome, there are also often abnormalities in other systems of the body including cardiovascular, skeletal, and urinary systems. When children are found to have a tendency to look close to objects, to have difficulty watching television, or to squint when looking at things, they should be taken for an ophthalmologic examination to determine the cause of these conditions and to rule out the presence of a lens dislocation. If a dislocated lens is found, you should actively seek the help of an ophthalmologist. Depending on the extent of the lens dislocation, the patient’s level of vision development, and the presence of complications, the doctor will decide whether to treat the dislocation conservatively or with surgical intervention. Conservative treatment is mainly optometry, which is suitable for patients with a small degree of dislocation, small astigmatism, good corrected vision and no complications such as glaucoma or uveitis. Frame glasses and corneal contact lenses are the commonly used correction methods. If the patient can obtain better vision by wearing glasses, and if study and life are not affected, conservative treatment can be maintained, with a follow-up visit every six months to determine the degree of progression of the dislocation and whether the glasses need to be replaced. Surgical treatment is often the final treatment method. Doctors often choose the appropriate surgical procedure based on the extent of the lens dislocation and the direction of the dislocation. Common surgical procedures include extracapsular removal of the lens, ultrasonic emulsion lens aspiration, and transciliary flat lens occlusion; if necessary, vitrectomy is performed first, followed by floating the dislocated lens in the vitreous cavity with the help of perfluorocarbon fluid (heavy water) and then ultrasonic crushing of the transciliary flat lens. In patients over 2 years of age, simultaneous IOL implantation is often required. If the suspensory ligament of the lens and the capsular bag still allow for the implantation of a capsular bag tension ring, the IOL can be implanted simultaneously with the capsular bag tension ring, which is sutured to the scleral wall if necessary. If there is not enough suspensory ligament and lens pouch support, the IOL often needs to be fixed to the sclera or iris. The exact method of implantation will depend on the patient’s dislocation, the type of IOL available, and the surgical approach that the surgeon specializes in. In the early days after surgical treatment, the patient will need regular follow-up visits to the hospital as prescribed by the doctor. After the patient’s post-operative inflammatory response has stabilized, he or she will still need to return to the hospital every six months to a year for routine eye examinations, including slit lamp, optometry and fundus examinations. For Marfon syndrome, patients will also need to see cardiovascular specialists, neurologists and orthopedics to perform the necessary tests (cardiovascular ultrasound, MRI, etc.) to rule out underlying cardiovascular pathology and to determine if oral prophylactic medications for complications of the cardiovascular system or other medical management are needed.”