超音波白内障手術後6か月間の眼圧変動

Changes in intraocular pressure during six months after phacoemulsification and aspiration surgery for cataract

　白内障手術術後の眼圧の変化は白内障手術の方法や術者の技能，緑内障の有無と関係している。1人の術者（NF）が行った通常の6mm切開超音波白内障手術のうち，術前眼圧が25 mmHg未満，van Herick 3度以上で，緑内障がなく他の眼手術の既往のない症例1,118眼を術前および術後6か月にわたって両眼で調べた。術前眼圧を5mmHg単位で分類すると，特に術前眼圧（mmHg）が20以上25未満の眼では，術後1週（19.90±9.62），1か月（15.09±4.85），3か月（13.00±3.10），6か月（13.17±4.25）と眼圧下降が顕著であった。また全群でも標準的な超音波白内障手術で眼圧は術後下降した。術後の眼圧下降は予想以上に大きく，この眼圧下降率は術前眼圧に依存していた。

We perspectively evaluated the pre- and postoperative intraocular pressures (I0Ps) of approxi-mately 1,000 cataract patients. All surgeries were performed using the same method of phacoemulsification and aspiration (PEA) with intraocular lens (IOL) implantation. The mean preoperative IOP (±SE) was 13.29±0.12 mmHg, while the mean postoperative IOPs were 10.87±0.12, 9.94±0.09, and 10.43±0.14 mmHg, at one, three and six months, respectively. When the preoperative IOP was in the low twenties, a decrease of approximately 40% was achieved. The present study shows that the IOP decreased postoperatively to a greater extent than expected, and the rate of decrease was dependent on the initial measurement.