Why should people with high myopia avoid strenuous exercise? Some people may think it is trivial, but it is not. High myopia is defined as myopia greater than 600 degrees. In addition to poor naked eye vision, the eyes of highly myopic patients also undergo a series of pathological changes, such as prolongation of the eye axis, post-scleral vitreous swelling, vitreous liquefaction, choroidal and retinal thinning and atrophy or degeneration, retinal fissures and detachment, and choroidal neovascularization. When strenuous exercise or excessive head shaking occurs, the eye will be overly shaken and the degenerated and atrophied retina will be fractured, leading to retinal detachment, which will directly result in blindness. The risk of retinal detachment is more than ten times higher in patients with moderate to high myopia than in those with non-myopia, and one third of patients with primary retinal detachment also have high myopia. In addition, patients with high myopia are prone to retinal fissures, but the symptoms are mild and may go unnoticed by the patient, which can cause retinal detachment if they are then strained by severe vibration. It is recommended that patients with high myopia, especially those with super high myopia (greater than 1200 degrees), should avoid sports with strong impact on the eyes or particularly strong physical confrontation: such as diving, boxing, bungee jumping, basketball, soccer, jumping and other strenuous sports, and replace them with more moderate intensity sports such as brisk walking, jogging, cycling, table tennis and badminton. At the same time, it is best to go to a regular hospital once a year for a comprehensive eye examination in order to detect potential health hazards in a timely manner. If there is a black shadow floating in front of the eyes or flashing sensation, it may be a precursor of retinal detachment, and should be treated immediately by the ophthalmology department of a regular hospital.