Reliability of pachymetric measurements using Orbscan after excimer refractive surgery
Reliability of pachymetric measurements using Orbscan after excimer refractive surgery
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DOI：
10.1016/s0161-6420(02)01298-8
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发表时间：
2003-03-01
期刊：
影响因子：
13.7
通讯作者：
Hoang-Xuan, T
中科院分区：
文献类型：
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作者：
Prisant, O;Calderon, N;Hoang-Xuan, T
目的。旨在评估激光原位角膜磨镶术 (LASIK) 和屈光性角膜切削术 (PRK) 后使用 Orbscan（博士伦，罗切斯特，纽约）进行厚度测量的准确性。设计：前瞻性仪器验证研究。参与者：79 只未手术的正常眼，LASIK 术后 84 只眼，PRK 后 50 只眼干预：激光原位角膜磨镶术或PRK方法：使用超声波和Orbscan II测量中央角膜厚度。根据正常眼组获得的结果调整声学系数 (AF)，以尽量减少超声和 Orbscan 测厚仪测量值之间的差异。主要结果测量：通过 Orbscan 和超声测厚仪测量的中央角膜厚度。结果：使用调整后的 AF（0.946），Orbscan 和超声测厚仪测量值之间的平均差异为 0 +/- 17、16 +/- 28 和 68正常组、LASIK 组和 PRK 组分别为 +/- 39 mum。所有组之间的差异具有统计学意义（P < 0.0001）。结论：LASIK 和 PRK 后 Orbscan 厚度测量值可能被低估且不太准确。 (C) 2003 年由美国眼科学会颁发。
Purpose. To assess the accuracy of pachymetric measurements using Orbscan (Bausch & Lomb, Rochester, NY) after laser in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK).Design: Prospective instrument validation study.Participants: Seventy-nine nonoperated normal eyes, 84 eyes after LASIK, and 50 eyes after PRKIntervention: Laser in situ keratomileusis or PRKMethods: Central corneal thickness was measured using ultrasound and Orbscan II. The acoustic factor (AF) was adjusted, based on the results obtained in the normal eye group, to minimize the difference between ultrasound and Orbscan pachymetric values.Main Outcome Measures: Central corneal thickness as measured by Orbscan and ultrasound pachymeter.Results: Using the adjusted AF, which was 0.946, the mean difference between Orbscan and ultrasonic pachymetric measurements was 0 +/- 17, 16 +/- 28, and 68 +/- 39 mum in the normal, LASIK, and PRK groups, respectively. The difference between all groups was statistically significant (P < 0.0001).Conclusions: Orbscan pachymetric values may be underestimated and less accurate after LASIK and PRK. (C) 2003 by the American Academy of Ophthalmology.