Quantifying metamorphopsia using M-CHARTS in patients with idiopathic macular hole

Abstract

Purpose : The aim of this study was to determine the degree of metamorphopsia using M-CHARTS in patients with an idiopathic macular hole (MH) before and after pars plana vitrectomy (PPV) and internal limiting membrane (ILM) peeling.

Methods : This was a retrospective study of 22 eyes of 22 patients with a full-thickness MH that underwent PPV and ILM peeling. Sulfur hexafluoride was injected in all eyes at the end of vitrectomy. The patients underwent a complete ophthalmological examination including SD-OCT. The horizontal and vertical metamorphopsia scores were determined by M-CHARTS at the same times.
Time course of metamorphopsia changes and their relation to best corrected visual acuity (BCVA) and OCT parameters were assessed.

Results : MH closure was noted in all eyes after surgery. The vertical M-score was significantly higher than horizontal M-score before surgery (P<0.05). Preoperative M-score did not correlate with MH dimensions including minimal diameter, height of the border or angle of inclination of the hole. The vertical M-score was significantly reduced at one months after surgery (0.96 vs 0.54; P<0.03). On the other hand, the horizontal M-score was significantly reduced at six months after surgery (0.58 vs 0.27; P<0.01). There was no difference between vertical and horizontal M-score six months postoperatively.

Conclusions : In patients with successfully operated MH, M-score decreased as early as one month. The ability to quantify the degree of vertical and horizontal M-scores with M-CHARTS will help explain differences in the metamorphopsia experienced by patients with MH.

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.