目的利用Orbscan-Ⅱ测量准分子激光原位角膜磨镶术(laser in situ reratomileusis,LASIK)术前术后眼前节参数的改变,探讨Orbscan-Ⅱ在LASIK术后测量不同屈光度近视的眼前节参数中可能存在的误差。方法应用Orb-scan-Ⅱ角膜地形图系统对进...目的利用Orbscan-Ⅱ测量准分子激光原位角膜磨镶术(laser in situ reratomileusis,LASIK)术前术后眼前节参数的改变,探讨Orbscan-Ⅱ在LASIK术后测量不同屈光度近视的眼前节参数中可能存在的误差。方法应用Orb-scan-Ⅱ角膜地形图系统对进行LASIK术的48例88眼于术前、术后第1个月测量角膜厚度和前房深度,术前根据屈光度分组:Ⅰ组-2.00~-6.00D,Ⅱ组-6.25~-12.50D。分别比较各组术前理论预测术后角膜最薄点厚度值和术后实际测量值、术前术后中央前房深度测量值之间的差异。结果Ⅰ组术前理论预测术后角膜最薄点厚度与术后实际测量角膜最薄点厚度比较,差异无统计学意义(P>0.05)。Ⅱ组术前理论预测术后角膜最薄点厚度与术后实际测量角膜最薄点厚度比较,差异有统计学意义(P<0.05),术后实际测量值小于术前理论预测值。两组术前术后测量中央前房深度值比较,差异有统计学意义(P<0.05),术后测量值小于术前测量值。结论Orbscan-Ⅱ对术后角膜厚度及前房深度的测量存在误差,术后角膜后表面前凸、角膜水肿混浊、调节的增加等是影响其准确性的可能因素。展开更多
AIM: To compare the anterior segment measurements obtained by rotating Scheimpflug camera(Pentacam) and Scanning-slit topography(Orbscan IIz) in keratoconic eyes.METHODS: A total of 121 patients, 71 males(58.7%)and 50...AIM: To compare the anterior segment measurements obtained by rotating Scheimpflug camera(Pentacam) and Scanning-slit topography(Orbscan IIz) in keratoconic eyes.METHODS: A total of 121 patients, 71 males(58.7%)and 50 females(41.3%)(214 eyes) with the diagnosis of keratoconus(KC) were enrolled in this study. Following diagnosis of KC by slit-lamp biomicroscopic examination, central corneal thickness(CCT), thinnest corneal thickness(TCT), anterior chamber depth(ACD),and pupil diameter(PD) were measured by a single examiner using successive instrumentation by Pentacam and Orbscan.RESULTS: There was no significant difference between the two instruments for the measurement of CCT and TCT. In contrast, scanning-slit topography measured ACD(3.46±0.40 mm vs 3.38±0.33 mm, P =0.019) and PD(4.97 ±1.26 mm vs 4.08 ±1.19 mm, P 【0.001) significantly larger than rotating Scheimpflug camera.The two devices made similar measurements for CCT(95% CI:-2.94 to5.06, P =0.602). However, the mean difference for TCT was-6.28(95% CI:-10.51 to-2.06, P =0.004) showing a thinner measurement by Orbscan than by Pentacam. In terms of the ACD, the mean difference was 0.08 mm(95%CI: 0.04 to 0.12, P 【0.001) with Orbscan giving a slightly larger value than Pentacam. Similarly, Orbscan measurement for PD was longer than Pentacam(95% CI:0.68 to 1.08, P 【0.001).CONCLUSION: A good agreement was found between Pentacam and Orbscan concerning CCT measurement while comparing scanning-slit topography and rotatingScheimpflug camera there was an underestimation for TCT and overestimation for ACD and PD.展开更多
文摘目的利用Orbscan-Ⅱ测量准分子激光原位角膜磨镶术(laser in situ reratomileusis,LASIK)术前术后眼前节参数的改变,探讨Orbscan-Ⅱ在LASIK术后测量不同屈光度近视的眼前节参数中可能存在的误差。方法应用Orb-scan-Ⅱ角膜地形图系统对进行LASIK术的48例88眼于术前、术后第1个月测量角膜厚度和前房深度,术前根据屈光度分组:Ⅰ组-2.00~-6.00D,Ⅱ组-6.25~-12.50D。分别比较各组术前理论预测术后角膜最薄点厚度值和术后实际测量值、术前术后中央前房深度测量值之间的差异。结果Ⅰ组术前理论预测术后角膜最薄点厚度与术后实际测量角膜最薄点厚度比较,差异无统计学意义(P>0.05)。Ⅱ组术前理论预测术后角膜最薄点厚度与术后实际测量角膜最薄点厚度比较,差异有统计学意义(P<0.05),术后实际测量值小于术前理论预测值。两组术前术后测量中央前房深度值比较,差异有统计学意义(P<0.05),术后测量值小于术前测量值。结论Orbscan-Ⅱ对术后角膜厚度及前房深度的测量存在误差,术后角膜后表面前凸、角膜水肿混浊、调节的增加等是影响其准确性的可能因素。
文摘AIM: To compare the anterior segment measurements obtained by rotating Scheimpflug camera(Pentacam) and Scanning-slit topography(Orbscan IIz) in keratoconic eyes.METHODS: A total of 121 patients, 71 males(58.7%)and 50 females(41.3%)(214 eyes) with the diagnosis of keratoconus(KC) were enrolled in this study. Following diagnosis of KC by slit-lamp biomicroscopic examination, central corneal thickness(CCT), thinnest corneal thickness(TCT), anterior chamber depth(ACD),and pupil diameter(PD) were measured by a single examiner using successive instrumentation by Pentacam and Orbscan.RESULTS: There was no significant difference between the two instruments for the measurement of CCT and TCT. In contrast, scanning-slit topography measured ACD(3.46±0.40 mm vs 3.38±0.33 mm, P =0.019) and PD(4.97 ±1.26 mm vs 4.08 ±1.19 mm, P 【0.001) significantly larger than rotating Scheimpflug camera.The two devices made similar measurements for CCT(95% CI:-2.94 to5.06, P =0.602). However, the mean difference for TCT was-6.28(95% CI:-10.51 to-2.06, P =0.004) showing a thinner measurement by Orbscan than by Pentacam. In terms of the ACD, the mean difference was 0.08 mm(95%CI: 0.04 to 0.12, P 【0.001) with Orbscan giving a slightly larger value than Pentacam. Similarly, Orbscan measurement for PD was longer than Pentacam(95% CI:0.68 to 1.08, P 【0.001).CONCLUSION: A good agreement was found between Pentacam and Orbscan concerning CCT measurement while comparing scanning-slit topography and rotatingScheimpflug camera there was an underestimation for TCT and overestimation for ACD and PD.