A 6-year-old child with a large eye or a small eye is considered to be caused by myasthenia gravis ophthalmoplegia or facial paralysis. It is recommended to go to the hospital for a detailed examination for the specific cause, and then take specific treatments according to the cause under the guidance of the doctor’s advice. 1. Myasthenia gravis ophthalmoplegia: the eyelid will be weakly lifted. This will cause the eyes on the affected side to be small, which is caused by ptosis, and can be relieved by applying neostigmine to the child. It is recommended to go to the hospital for examination and treatment. 2. Facial paralysis: This is usually caused by compression of the facial nerve vessels or cerebrovascular disease, which leads to the symptom of one small eye. There may be other reasons why a 6-year-old child’s eyes are so small. It is recommended that the child go to the hospital in time for a complete examination to determine the cause of the problem, and then be given targeted treatment or therapy. The above medications should be used under the guidance of a doctor.