Eyes suddenly become a large and small, usually eyelid area disease, such as monocular swelling or monocular ptosis, swelling is an allergic reaction, granuloma or mosquito bites cause, most patients have pain, itching symptoms, the use of hormones, anti-allergic eye ointment, or antibiotic, anti-bacterial ointment for treatment. Sudden onset of ptosis, usually the motor nerve dysfunction, need to first clarify whether the brain disease, the most common is the brain occupational lesions, if the levator ani muscle localized disease is also possible, consider inflammation or orbital occupational lesions. In this case, neurology and ophthalmology should be carefully investigated, especially relevant imaging is very critical. Ptosis is caused by purely neurological factors, and only needs to be treated with nutritive nerve medication, and most of them can have some improvement.