Unusual Presentation of Convergence insufficiency in Parkinsons' Disease patient stimulated by Deep Brain Stimulation

72 y.o. man with PD and hypertension presenting for the evaluation of blurry vision at near and mid distance that started after activation of an implanted DBS. Physical exam with DBS turned off showed BCVA 20/20, normal pupil exam, VF and DFE. Motility was full and eyes straight at distance and near. Following this examination, the DBS was turned on and reevaluation showed same findings except for a 6 prism diopter XT at near consistent with CI. Following our evaluation a set of +3 diopters base-in prisms were added to near glasses with total relief of symptoms. The patient didn't need to have the electrodes of the DBS re-implanted.