Abstract Objective Intraocular pressure(IOP)measurement is very important in the patient received LASIK．The Pentacam system ofer a good way of correcting IOP measured with tonometer．The purpose of present paper attempted to assess theaccuracy of corrected value of IOP measured by Goldmann applanation tonometer(GAT)using Pentacam system before and afterlaser in situ keratomileusis(LASIK)． Methods GAT was used to measure the 208 eyes of 105 cases with the mean pre—operative spherical equivalent refraction(一5．81 4-2．02)D before operation and 12 months after operation，and Pentacam system(Pentacam，OCULUS)was used in the same cases for the correct of GAT measurement value．The corrected IOP value wascalculated using the correction tables proposed by Ehlers，Shah，Dresden，Orssengo／Pye and Koblhaas respectively． Results
The nlean IOP value by GAT was(15．75±2．59)mmHg before LASIK and(10．78±2．27)mmHg after LASIK，indicating asignificant reduce following an operative procedure(P <0．0 1)．The corrected IOP value by Pentacam was upon central cornealthickness(CCT)and keratometry values as measured(P<0．01)．There was a negative linear relationship between CCT andcorrected IOP for the propose of Ehlers，Shah and Dresden and an exponential correction for the propose of Orssengo／Pye(r=0．73—1．00，P <0．0 1)，but no significant correlation between IOP and corneal radiual curvature was found among the fourmethods(r=0．036 —0．065，P >0．05)．The corrected IOP value proposed by Kohlhaas was influenced by CCT and cornealcurvature(P<0．O1)．No statistically significant difference in corrected lOP value proposed by Ehlers was found between beforeand after LASIK (t=1．779，P>0．05)． Conclusion A correction of GAT data according to Pentacam correction tables ishelpful for determining the IOP value．The method of Ehlers is recommended to be used after LASIK．
Key words Goldmann applanation tonometer； Pentacam system； corrective intraocular pressure； laser in situkeratomileIJsis
摘要 目的评价Pentacam三维眼前节分析诊断系统对准分子激光原位角膜磨镶术(LASIK)前后眼压测量值校正的准确性。
方法 将105例(208眼)拟行LASIK的患者于术前和术后12个月分别行Pentacam三维眼前节分析系统检查和Goldmann压平眼压测量，并用Pentacam系统所提供的5种校正方法对眼压测量值进行校正。
结果 208眼LASIK术前眼压(15．75±2．59)mmHg，术后(10．78±2．27)mmHg，术后眼压明显低于术前(P<0．O1)；在Pentacam系统校正眼压的方法中除Kohlhaas法外，均只依据角膜顶点厚度对眼压进行校正。在5种修正方法中，Ehlers、Shah和Dresden法的眼压修正值与角膜厚度成负相关；Orssengo／Pye法的校正值随角膜厚度的增减依指数曲线关系变化；Kohlhaas法依据不同的角膜厚度和角膜曲率对眼压测量值进行校正。经Pentacam 系统校正后，只有Ehlers法校正的眼压术前、术后差异无统计学意义(P>0．05)。
结论 Pentacam三维眼前节分析诊断系统根据角膜厚度和／或角膜曲率校正眼压测量值，LASIK术后建议使用Ehlers法对眼压测量值进行修正，有助于对可疑青光眼和眼压异常者进行判断。
眼压是诊断和评价青光眼治疗效果的重要指标之一。眼压的测量受角膜厚度和／或角膜曲率的影响，准分子激光手术后眼压测量值普遍降低 。 Pentacam三维眼前节分析诊断系统可同时获取角膜前后表面曲率及全角膜厚度，并可依据检查结果对眼压测量值进行修正。本研究的目的是评价Pentacam三维眼前节分析诊断系统对准分子激光原位角膜磨镶术(1aser in situkeratomileusis，LASIK)前后眼压测量值校正的准确性。
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