後房レンズ嚢内固定眼における術後前房深度の経時的変化

Anterior chamber depth after posterior chamber lens implantation surgery

　計画的嚢外摘出術および後房レンズ（PC-IOL）移植術を施行した44眼について前房深度（以下ACD）を術前および術後10か月にわたりAモードエコーグラフィーを用いて測定した。術前に比べ術後1週目にはACDは一度有意に深くなった（危険率p＜0.01）が，術後2週目には術前の値にまで浅くなる傾向を示した。しかし術後1か月目以降再び徐々に深くなり，3か月目には術前より平均0.29mm深くなり以後安定した。術後1週目の屈折値を基準とした屈折度の変化はACDが浅くなる2週目には有意に近視化したが，再び深くなって安定する3か月目には1週目の値に近づいた。このACDの変化は眼内でのIOLの前後方向の位置の変化と考えられ，白内障術後の視力安定を規制する要因のひとつに挙げられる。

We measured the anterior chamber depth in 44 eyes that underwent posterior chamber intraocular lens (IOL) implantation surgery. An A-mode echography was used in the measurement. The IOL was of biconvex optics and C-looped haptics angled 5 derees anteriorly. The eyes were followed up until 10 months. Refractive state was measured by an autorefractometer at 1, 2 and 12 weeks after surgery. The anterior chamber depth averaged 3.30±0.55mm before surgery. It averaged and 3.33±0.37mm at 2 days, 3.53±0.37mm at 1 week, 3.25±0.43mm at 2 weeks and 3.57±0.41 at 12 weeks after surgery. It remained stabilized thereafter. There was no difference in the value before and 2 days after surgery. The value at 1 week was significantly greater than the preoperative value (p＜0.01). The value increased during 2 days to 1 week after surgery in 71% of eyes. It became shallower again to reach the preoperative value. The refractive state tended toward myopia along with decrease in chamber depth at 2 weeks after surgery. The refractive state became the same between 1 week and 3 months after surgery.