An unusual presentation of convergence insufficiency in a patient with Parkinson's disease stimulated by deep brain stimulation.

Purpose: To report convergence insufficiency in a patient with Parkinson's' disease stimulated by turning on the deep brain stimulator.

Observations: 72-year-old male with Parkinson's disease and hypertension presenting for the evaluation of blurry vision at near and mid distance that started after activation of an implanted Deep brain stimulator.Baseline ophthalmologic evaluation prior to deep brain stimulator implantation surgery and with the deep brain stimulator turned off demonstrated a full motility, centered eyes for distance and near and a best corrected visual acuity of 20/20, normal pupil exam, confrontational visual fields and dilated fundus exam.