Normal until the age of 40, the eyes are currently a little outwardly slanted, usually due to exotropia. The onset of esotropia is not necessarily present at birth, but may gradually manifest itself in adulthood, and therefore the onset of esotropia at the age of 40 is completely normal. Patients with esotropia should go to the ophthalmology department of a hospital for an examination to determine the cause of the disease, which may be either common esotropia due to uncoordinated movements of the extraocular muscles of both eyes, or paralytic esotropia due to paralysis of the extraocular muscles. Common esotropia usually requires surgical treatment, while paralytic esotropia can be treated with neurotrophic drugs to promote recovery, such as oral methylcobalamin tablets. Specific medication should be taken under doctor’s guidance. It is recommended to go to a regular hospital for examination and treatment.