MacRae S, Rich L, Phillips D, Bedrossian R
Department of Ophthalmology, Oregon Health Sciences University, Portland.
Am J Ophthalmol. 1989 Mar 15;107(3):262-7. doi: 10.1016/0002-9394(89)90310-3.
We tested eight patients who had undergone radial keratotomy with regard to refraction, keratometry, corneal thickness, and intraocular pressure one to two weeks after surgery. Patients were examined immediately after eye-lid opening at 7:30 A.M. and again at 4:00 P.M. The contralateral eye was used as a control. The treated eye was 1.48 +/- 0.24 diopters (mean +/- S.E.M.) more hyperopic at the morning examination compared to the afternoon visit, whereas the control eye had an insignificant shift (0.16 +/- 0.06 diopters). The treated eye was significantly flatter (1.37 +/- 0.19 diopters) in the morning than in the afternoon when compared to the control eyes, which were only 0.11 +/- 0.09 diopter flatter. The intraocular pressure changed insignificantly in both the treated and control eyes (-0.5 +/- 0.53 mm Hg and -0.5 +/- 0.84 mm Hg, respectively). The mean morning corneal thickness was significantly greater (5.7%) than the afternoon thickness when compared to the controls (1.7% morning increase in thickness). These data suggest that diurnal variation in corneal thickness after radial keratotomy plays a role in diurnal variation of vision in the early postoperative period.
我们对8名接受了放射状角膜切开术的患者在术后1至2周进行了验光、角膜曲率测量、角膜厚度测量及眼压测量。患者于上午7:30睁眼后立即接受检查，并于下午4:00再次检查。对侧眼作为对照。与下午检查相比，手术眼在上午检查时远视度数增加了1.48±0.24屈光度（平均值±标准误），而对照眼的变化不显著（0.16±0.06屈光度）。与对照眼相比，手术眼上午的角膜曲率明显更平（1.37±0.19屈光度），对照眼仅平了0.11±0.09屈光度。手术眼和对照眼的眼压变化均不显著（分别为-0.5±0.53 mmHg和-0.5±0.84 mmHg）。与对照眼相比，手术眼上午的平均角膜厚度显著增加（5.7%），而对照眼上午厚度增加了1.7%。这些数据表明，放射状角膜切开术后角膜厚度的昼夜变化在术后早期视力的昼夜变化中起作用。
