Patients with 300 degrees of nearsightedness will experience a loss of vision, but how far they can see cannot be accurately predicted due to individual differences. Patients can go to the ophthalmology department of the hospital for a vision examination to find out the current situation of vision loss. Myopia is a common ophthalmologic condition that causes patients to lose their distance vision, and the higher the degree of myopia, the more obvious the vision loss. The higher the degree of myopia, the more pronounced the vision loss. Generally speaking, myopia of 300 degrees belongs to moderate myopia, which will have a more obvious impact on vision, but because of the existence of individual differences, even for the same degree of myopia, the degree of vision loss of different patients is also different, and therefore it is not possible to accurately speculate on the current situation of vision loss based on the degree of myopia alone. If patients want to know the current situation of vision loss, they need to go to the ophthalmology department of the hospital in time for vision examination. Usually, patients with 300 degrees of myopia will need to wear eyeglasses to regain clear vision.