Figure 1 (A) Original eye horizontal eye movement recordings of right and left eye before and after treatment with gabapentin, where (i) is a patient with multiple sclerosis before and after treatment with 2400 mg gabapentin (patient 11); (ii) a patient with idiopathic congenital nystagmus before and after treatment with 1200 mg gabapentin (patient 17); and (iii) a patient with achromatopsia before and after treatment with 2400 mg gabapentin (patient 19). (B) Shows a patient with multiple sclerosis before treatment, after treatment with 2400 mg gabapentin, and after treatment with 20 mg memantine (patient 13).