Patel Dipali, Rahman Rubina, Kumarasamy Manjula
Calderdale Royal Hospital, Halifax, West Yorkshire, United Kingdom.
J Cataract Refract Surg. 2007 Oct;33(10):1760-2. doi: 10.1016/j.jcrs.2007.05.031.
To report the accuracy of intraocular lens (IOL) power estimation in eyes having combined phacoemulsification and vitrectomy for macular holes and to compare the axial length (AL) in those eyes with that in the fellow eyes.
Calderdale Royal Hospital, Halifax, West Yorkshire, United Kingdom.
The mean and standard deviation of the refractive aim, achieved refraction, and postoperative prediction error (calculated as difference between achieved refraction and refractive aim) were determined in 40 patients who had phacovitrectomy with gas tamponade for the treatment of idiopathic macular holes. The percentage of patients with an achieved refraction within +/-0.50 diopter (D), +/-1.00 D, and more than 2.00 D of the refractive aim was recorded. The mean absolute error (MAE) of the postoperative prediction error was calculated. In addition, the AL in eyes with macular holes was compared with that in fellow eyes. Axial lengths were measured using applanation A-scan ultrasound.
Of eyes having phacovitrectomy, 45.0%, 67.5%, and 90.0% achieved a postoperative refraction within +/-0.50 D, +/-1.00 D, and +/-2.00 D, respectively, of the refractive aim; 10.0% of eyes were more than -2.00 D from the refractive aim. The overall postoperative prediction error ranged from +1.64 D to -2.51 D. The mean refractive aim was +0.30 +/- 0.72 D and the mean achieved refraction, -0.09 +/-1.25 D. There was no clinically significant difference between the means. The mean postoperative prediction error was -0.39 +/- 1.01 D, suggesting a myopic overcorrection occurred postoperatively. The MAE of the postoperative prediction error was 0.83 D. The mean AL was 23.40 mm in operated eyes and 23.46 mm in fellow eyes.
The achieved refraction after phacovitrectomy for macular holes was comparable to results after phacoemulsification alone. The myopic overcorrection after phacovitrectomy might be a result of the gas bubble causing forward displacement of the capsular bag and IOL or inaccuracies in AL and keratometry measurements. Aiming for residual hyperopia may counteract the overcorrection. There was no difference in AL between eyes with macular holes and fellow eyes.
报告在因黄斑裂孔行白内障超声乳化吸除联合玻璃体切除术的眼中人工晶状体（IOL）屈光度估算的准确性，并比较这些眼与对侧眼的眼轴长度（AL）。
英国西约克郡哈利法克斯的卡尔德代尔皇家医院。
测定40例行晶状体玻璃体切除术并使用气体填塞治疗特发性黄斑裂孔患者的屈光目标、实际屈光度数及术后预测误差（计算为实际屈光度数与屈光目标的差值）的均值和标准差。记录实际屈光度数在屈光目标±0.50屈光度（D）、±1.00 D及超过±2.00 D范围内的患者百分比。计算术后预测误差的平均绝对误差（MAE）。此外，比较黄斑裂孔眼与对侧眼的AL。使用压平A超测量眼轴长度。
在接受晶状体玻璃体切除术的眼中，分别有45.0%、67.5%和90.0%的患者术后屈光度数在屈光目标的±0.50 D、±1.00 D和±2.00 D范围内；10.0%的眼实际屈光度数与屈光目标相差超过 -2.00 D。术后总体预测误差范围为 +1.64 D至 -2.51 D。平均屈光目标为 +0.30±0.72 D，平均实际屈光度数为 -0.09±1.25 D。两者均值无临床显著差异。术后平均预测误差为 -0.39±1.01 D，提示术后发生近视性过矫。术后预测误差的MAE为0.83 D。手术眼的平均AL为23.40 mm，对侧眼为23.46 mm。
黄斑裂孔行晶状体玻璃体切除术后的实际屈光度数与单纯白内障超声乳化吸除术后的结果相当。晶状体玻璃体切除术后的近视性过矫可能是由于气泡导致囊袋和IOL向前移位，或AL及角膜曲率测量不准确所致。目标设定为残留远视可能会抵消过矫。黄斑裂孔眼与对侧眼的AL无差异。
