Ethambutol-induced optic neuropathy with rare bilateral asymmetry onset: A case report

Figure 3 Retinal nerve fiber layer high-definition optical coherence tomography. A: At the first visit, the retinal nerve fiber layer (RNFL) of the right eye had mild thickening in the superior, inferior and nasal regions; the RNFL of the left eye had mild thickening on the temporal side; B: Six months after drug withdrawal, the RNFL of both eyes became thinner compared with the first visit; the RNFL of the right eye was within the normal range; and the average and inferior thicknesses of the RNFL in the left eye were lower than normal; C: Eighteen months after stopping drug treatment, the RNFL of both eyes further decreased, and the temporal side of both eyes became thinner significantly.