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(C4-2-21) 当院で行ったエキシマレーザー屈折矯正手術(photorefractive keratectomy:PRK)後の眼圧評価につき検討した。症例は31名50眼で,年齢28.3±9.5歳,術前等価球面度数−4.2±1.9Dであった。PRK術前,術後の眼圧測定値を比較したところ,術前眼圧14±2mmHg,術後眼圧12±3mmHgと有意に低下していた(p<0.01,Mann-Whitney U検定)。また,矯正度数角膜厚,角膜曲率と眼圧との相関を調べたところ,有意な相関関係を示した。PRK術後は眼圧が過小評価されている可能性があり,角膜形状の変化を伴う屈折矯正手術後の眼圧評価は慎重にすべきと考えた。
We reviewed 50 eyes of 31 patients regarding the intraocular pressure (IOP) following excimer laser photorefractive keratectomy (PRK). The ages averaged 28.3 ± 9.5 years. The preoperative spherical equivalent averaged -4.2 ± 1.9 D. A noncontact pneumatic tonometer was used in measuring the IOP. The IOP averaged 14±2 mmHg before surgery and 12±3 mmHg one month after surgery. The difference was significant (p <0.01, Mann-Whitney U test). The TOP was significantly correlated with the corrected diopter value, corneal thickness and corneal curvature. The findings show that postoperative TOP may be underestimated due to decreased corneal thickness and curvature. This feature has to be paid due attention in evaluating IOP after photorefractive surgery.
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