There are several cases of 300 degree myopia corrected vision, one is that if the optic nerve and retinal visual pathway of both eyes are normal, the normal vision of 300 degree myopia corrected vision should be 5.0. Another case is that the degree itself is greater than 300 degrees, with 300 degrees of glasses. The corrected visual acuity may be lower than 5.0, possibly 4.8 or 4.6. Another situation is that the glasses worn are too old, or there may be only 200 degrees or 250 degrees, with 300 degrees of glasses, the distance vision may reach 1.2-1.5, but seeing things will be very fatigue, see close not clear. So the corrected visual acuity of 300 degrees myopia, if it is normal only 300 degrees, with 300 degrees of myopia glasses, and the visual pathway is normal, this visual acuity should be between 5.0-5.1.