LASIK手術病人中心角膜厚度以Pentacam OrbscanⅡ及超音波厚度儀之測量結果

目的：針對接受LASIK的病患，於手術前、後分別用Pentacam、Orbscan Ⅱ、及超音波(ultrasound pachymetry)測量中心角膜厚度，來比較三種儀器之間的異同。方法：本研究共收集LASIK手術前31位病人（62隻眼睛）、及LASIK術後四週32位病人（64隻眼睛）的資料，依序用Pentacam、Orbscan Ⅱ、及超音波測量中心角膜厚度，將三種儀器的測量結果作ANOVA統計分析。結果：LASIK手術前三種儀器的測量結果呈現高度相關，三者間並無差異；LASIK術後四週，三種儀器之間的差異有統計學上的意義，其中以Orbscan Ⅱ所量的厚度最薄(408.15±46.19μm)、Pentacam最厚(437.15±34.46 μm)。結論：正常角膜用Pentacam、Orbscan Ⅱ、及超音波測量中心角膜厚度，結果相似，也都有極佳的可重複性(repeatability)及正確性(validity)；但是，在LASIK術後的病人，用Orbscan Ⅱ測量的中心角膜厚度則明顯比超音波及Pentacam要薄。所以，在LASIK術後，Pentacam可做為超音波以外，測量中心角膜厚度的參考，但若用Orbscan Ⅱ測量時，則要特別留意低估角膜厚度的情形。

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並列摘要

Purpose: The present study was designed to compare Pentacam, Orbscan Ⅱ, and ultrasound pachymetry in measuring central corneal thickness (CCT) in eyes before and after LASIK surgery. Method: A total of 31 patients (62 eyes) were measured before surgery. Another group of 32 patients (64 eyes) were measured 4 weeks after LASIK. The measurements of central corneal thickness were performed in the sequence of Pentacam, Orbscan Ⅱ, and ultrasound pachymetry. The data were collected and analyzed with ANOVA. Result: Before surgery, the CCT measured by 3 modalities were not significantly different (p=0.136). However, statistical difference was found for CCT measurements between 3 instruments after LASIK (p＜0.001). Besides, CCT values obtained by Orbscan Ⅱ were much thinner than those obtained by Pentacam and ultrasound pachymetry. Conclusion: Pentacam, Orbscan Ⅱ and ultrasound pachymetry obtain similar CCT values in normal eyes, while Orbscan Ⅱ obtains thinner CCT values than Pentacam and ultrasound in eyes after LASIK. This discrepancy may lead the surgeon to be more conservative in using Orbscan Ⅱ after primary refractive surgery.

並列關鍵字

Central corneal thickness ； LASIK ； Orbscan Ⅱ ； Pentacam

國際替代計量

LASIK手術病人中心角膜厚度以Pentacam OrbscanⅡ及超音波厚度儀之測量結果

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