How many degrees is ultra-high myopia

Myopia is divided into mild, moderate, high, ultra-high myopia is a more special category, refers to the patient's myopia degree of more than 900 degrees of myopia. Under normal circumstances, ultra-high myopia caused by retinal complications, most patients will show retinal degeneration, retinal holes, eventually causing retinal detachment; in addition, patients are also prone to macular degeneration.