Myasthenia gravis may lead to vision loss and amblyopia, but it is usually not severe enough to occur as eye blindness. Blindness is diagnosed in ophthalmology when the visual acuity and field of vision are below a certain value of best corrected visual acuity and range. Myasthenia gravis is characterized by ptosis in both eyes and inability to open the eyes. If it occurs during the sensitive period of visual development with a completely covered pupil, it can lead to severe amblyopia, but it does not usually progress to the point of blindness with visual acuity of less than 0.05. However, in general, in addition to the above cases, the occurrence of myasthenia gravis ptosis at an older age after the completion of visual development will not lead to blindness, but also under the guidance of the doctor in a timely manner for medication or surgical treatment, to avoid the appearance of the eye or the eye function of the impact on the larger. It is recommended that patients with myasthenia gravis seek medical attention to evaluate their condition and follow their doctor’s instructions.