Myopia 300 degrees if patients insist on not wearing glasses, is not good for the eyes, easy to cause visual fatigue, may lead to myopia deepening. Myopia is a common disease in ophthalmology, which can lead to blurring of distant scenes, but it has little effect on the near scenes. 300 degrees of myopia is already moderate myopia, if you do not wear glasses, the patient’s distance vision can be significantly affected. In order to see things clearly patients can appear squinting to see things, in the long run it is easy due to visual fatigue and aggravate myopia. In order to protect the eyes, myopia patients need to develop good eye habits and avoid eye fatigue, such as not to use the eyes in a dim or shaky environment, not to use computers, tablets, cell phones and other electronic devices for a long time, and not to lie on the bed to read books. It is recommended that myopic patients seek timely medical attention to assess their condition and follow the doctor’s instructions for treatment.