目的比较lenstar LS 900与角膜超声测厚仪测量人中央角膜厚度(CCT)的差异,为临床检查提供参考。方法选取屈光手术者26例(52只眼),分别用lenstar LS 900和角膜超声测厚仪测量双眼CCT,两种仪器均测量3次或以上,取其平均值,对所得数据进行...目的比较lenstar LS 900与角膜超声测厚仪测量人中央角膜厚度(CCT)的差异,为临床检查提供参考。方法选取屈光手术者26例(52只眼),分别用lenstar LS 900和角膜超声测厚仪测量双眼CCT,两种仪器均测量3次或以上,取其平均值,对所得数据进行统计学分析。结果 52只眼CCT测量结果:lenstar LS 900为(538.27±40.38)μm,A超为(534.15±41.12)μm。两种测量方法结果差异有统计学意义(t=2.9643,P<0.005)。但测量结果高度相关(r=0.970),前者所测CCT较后者厚(4.11±10.11)μm。结论 lenstar LS 900与角膜超声测厚仪对CCT的测量结果呈较高的相关性,两种仪器具有较高的测量准确性,lenstar LS 900可以作为角膜厚度的测量工具之一。展开更多
AIM:To evaluate the reliability of measurements of corneal changes with accommodation in healthy eyes using a Scheimpflug imaging-based system and how these measurements distribute in the normal population.METHODS:Pro...AIM:To evaluate the reliability of measurements of corneal changes with accommodation in healthy eyes using a Scheimpflug imaging-based system and how these measurements distribute in the normal population.METHODS:Prospective,non-randomized,comparative study including 27 healthy subjects(54 eyes),including emmetropia(13 eyes),myopia(17 eyes),hyperopia(4 eyes)and astigmatism(20 eyes)groups.In all cases,a complete eye examination was performed,including the analysis of corneal changes with different accommodative stimuli(+2.00,0.00 and-3.00 D)using the Pentacam AXL system.The investigation was structured in 2 phases:repeatability analysis and characterization of accommodation-related corneal changes in healthy populations.RESULTS:In the repeatability analysis,the index of height asymmetry(IHA)showed the greatest variability with the three accommodative stimuli,being the results for the rest of parameters acceptable.The group of emmetropes showed significant differences with accommodative changes in the position of maximum keratometry(Kmax;P<0.05),whereas in the astigmatism group,significant changes were not only observed in the position of Kmax,but also in minimum corneal thickness(MCT),corneal spherical aberration,and total and low order aberration root mean square(all P<0.05).Likewise,a significant difference was found in the displacement of the X position of Kmax with+2.00 D and-3.00 D in the myopia group(P=0.033)as well as in changes with+2.00 D and-3.00 D in the magnitude of the position vector of Kmax in the emmetropia group(P<0.05).No significant changes were found between accommodative stimuli in the displacement of coordinates of MCT(P≥0.109).CONCLUSION:The position of Kmax and MCT in healthy corneas can change significantly when presenting different accommodative stimuli using the accommodation mode of the Pentacam system,with different trends in these accommodation-related corneal changes between refractive errors.Likewise,the consistency of the measurements obtained with Scheimpflug has been confirmed.展开更多
文摘目的比较lenstar LS 900与角膜超声测厚仪测量人中央角膜厚度(CCT)的差异,为临床检查提供参考。方法选取屈光手术者26例(52只眼),分别用lenstar LS 900和角膜超声测厚仪测量双眼CCT,两种仪器均测量3次或以上,取其平均值,对所得数据进行统计学分析。结果 52只眼CCT测量结果:lenstar LS 900为(538.27±40.38)μm,A超为(534.15±41.12)μm。两种测量方法结果差异有统计学意义(t=2.9643,P<0.005)。但测量结果高度相关(r=0.970),前者所测CCT较后者厚(4.11±10.11)μm。结论 lenstar LS 900与角膜超声测厚仪对CCT的测量结果呈较高的相关性,两种仪器具有较高的测量准确性,lenstar LS 900可以作为角膜厚度的测量工具之一。
文摘AIM:To evaluate the reliability of measurements of corneal changes with accommodation in healthy eyes using a Scheimpflug imaging-based system and how these measurements distribute in the normal population.METHODS:Prospective,non-randomized,comparative study including 27 healthy subjects(54 eyes),including emmetropia(13 eyes),myopia(17 eyes),hyperopia(4 eyes)and astigmatism(20 eyes)groups.In all cases,a complete eye examination was performed,including the analysis of corneal changes with different accommodative stimuli(+2.00,0.00 and-3.00 D)using the Pentacam AXL system.The investigation was structured in 2 phases:repeatability analysis and characterization of accommodation-related corneal changes in healthy populations.RESULTS:In the repeatability analysis,the index of height asymmetry(IHA)showed the greatest variability with the three accommodative stimuli,being the results for the rest of parameters acceptable.The group of emmetropes showed significant differences with accommodative changes in the position of maximum keratometry(Kmax;P<0.05),whereas in the astigmatism group,significant changes were not only observed in the position of Kmax,but also in minimum corneal thickness(MCT),corneal spherical aberration,and total and low order aberration root mean square(all P<0.05).Likewise,a significant difference was found in the displacement of the X position of Kmax with+2.00 D and-3.00 D in the myopia group(P=0.033)as well as in changes with+2.00 D and-3.00 D in the magnitude of the position vector of Kmax in the emmetropia group(P<0.05).No significant changes were found between accommodative stimuli in the displacement of coordinates of MCT(P≥0.109).CONCLUSION:The position of Kmax and MCT in healthy corneas can change significantly when presenting different accommodative stimuli using the accommodation mode of the Pentacam system,with different trends in these accommodation-related corneal changes between refractive errors.Likewise,the consistency of the measurements obtained with Scheimpflug has been confirmed.
