This is a single-center, randomized controlled trial to compare the effectiveness of transcranial electrical stimulation combined with visual training with visual training alone for the treatment of accommodation disorder patients.
Inclusion criteria for small-angle acute concomitant esotropia: clinical diagnosis of acute aquired concomitant esotropia; strabismus angle ≤ 15PD; age 18 < age < 40; best corrected visual acuity of both eyes ≥ 1.0.
Inclusion criteria for presbyopia: clinical diagnosis of presbyopia; best corrected visual acuity of both eyes ≥ 1.0.
no history of other eye diseases or eye surgeries
no history of neuropsychiatric diseases for the individual or relatives
no head injuries or surgeries
no history of epilepsy or stroke