特発性黄斑上膜における硝子体術後早期の網膜感度の経時的変化

Early changes in retinal sensitivity following vitreous surgery for idiopathic epiretinal membrane

要約　背景：Macular Integrity Assessment（maia^®，Topcon社）は，眼底を共焦点走査レーザー検眼鏡で観察する微小視野装置である。刺激幅が広く，眼底像が鮮明で，検査時間が短い。目的：特発性黄斑上膜に対して行った硝子体手術後早期の中心網膜感度をmaia^®で測定した報告。対象と方法：5か月間に25G小切開硝子体手術が行われた黄斑上膜26例29眼を対象とした。術前と術後にmaia^®により，中心20°以内の89点の網膜感度を測定した。視力はlogMARで評価した。結果：89点の網膜感度の平均は，術前21.1dB，術後1か月22.6dB，術後3か月23.4dBであり，術後3か月で有意に増加した。視力はそれぞれ0.42，0.20，0.17で，術後1か月から有意に改善した。結論：特発性黄斑上膜に対する硝子体手術では，網膜感度が3か月後から改善する。

Abstract.　Purpose：To report early changes in retinal sensitivity following vitreous surgery for idiopathic epiretinal membrane. Cases and Method：This study was made on 29 eyes of 26 patients who received 25-G vitreous surgery for epiretinal membrane during 5 months. Retinal sensitivity within 20 degrees from the fixating point was measured using Macular Integrity Assessment^®（Topcon）before and after surgery. Visual acuity was evaluated as logMAR. Results：Retinal sensitivity at 89 measured points averaged 21.1dB before surgery, 22.6 dB one month and 23.4 dB 3 months after surgery. The difference between values before and 3 months after surgery was significant. Visual acuity averaged 0.42, 0.20 and 0.17 respectively. It improved significantly after one month of surgery. Conclusion：Retinal sensitivity improved after 3 months of vitreous surgery for idiopathic epiretinal membrane.