Effects of Ocular Electroacupuncture on Trochlear Nerve Palsy

Inclusion criteria; 1. patient with confirmed diagnosis of trochlear nerve palsy made by neurologist or ophthalmologist; 2. patient in stable condition after treatment for primary disease; 3. age between 18 to 80 years old without gender limitation; 4. haven't received acupuncture intervention for TNP before; 5. patient with conscious, willing to cooperate and voluntarily agreed to participate and signed informed consent forms. Exclusion criteria: 1. those with other diagnosed medical conditions known to contribute to TNP symptoms, such as thyroid disease, myasthenia gravis, mitochondrial myopathy, congenital strabismus or received strabismus surgery; 2. those with color blindness, dyschromatopsia or abnormal retinal correspondence couldn't complete computerized diplopia test; 3. those with serious medical conditions that might limit their participation; 4. those with eye or other location with serious infections; 5. women who had a positive pregnancy test or who were planning to become pregnant during the study period; 6. those with bleeding tendency, blood coagulation dysfunction or taken anticoagulant drugs; 7. who had participate in other clinical trials, which may affect the results.