Visual recovery after oral high-dose methylprednisolone in acute inflammatory optic neuropathy.

Purpose: High doses of venous corticosteroids are currently the only validated treatment for the management of optic neuritis (ON). The objective is to assess the changes in visual function parameters after oral high-dose methylprednisolone in patients with ON.

Methods: A retrospective analysis of patients with acute ON was performed. Patients received 1 g per day of oral methylprednisolone for 3 to 5 days. Visual function was measured using the ETDRS test for visual acuity, 30-2 automated visual field test, contrast sensitivity test, and color vision test before treatment, 4 days, 2 weeks, 1 month and 3 months, and 6 months following treatment. To assess anatomical changes, optical coherence tomography of the ganglion cells was performed at various timepoints.

Results: Between September 2014 and September 2016, a total of 29 patients were included in the study. More than 80% of patients had recovered normal visual acuity after 3 and 6 months. This recovery of all parameters of visual function was observed as early as 4 days but occurred predominantly within 15 days after the initiation of treatment. We observed a thinning of the ganglion cell layer during the follow-up, which mainly occurs within one month. The P100 wave of visually evoked potentials was discernible in all patients at 6 months. During the 6 years of follow-up, 2 patients had experienced a relapse of ON. No serious adverse effects were observed.

Conclusion: This study demonstrated a rapid recovery of all visual function parameters after oral high-dose methylprednisolone ON with no serious adverse effects.