目的:通过比较手提式角膜曲率仪KM-500 AUTO KERATOMETER(以下简称KM-500)与传统台式角膜曲率仪(OM-4)的特点及准确性,评价KM-500手提式角膜曲率仪的临床应用价值.方法:83例108只眼白内障患者,术前分别应用手提式角膜曲率仪KM-500,台式...目的:通过比较手提式角膜曲率仪KM-500 AUTO KERATOMETER(以下简称KM-500)与传统台式角膜曲率仪(OM-4)的特点及准确性,评价KM-500手提式角膜曲率仪的临床应用价值.方法:83例108只眼白内障患者,术前分别应用手提式角膜曲率仪KM-500,台式角膜曲率仪OM-4测量角膜中央曲率的最大值、最小值.结果:两种检测仪所测得的角膜曲率的最大值、最小值均无显著性差异(P＞0.05).结论:应用手提式角膜曲率仪KM-500进行角膜曲率测量具有与传统台式角膜曲率仪OM-4一样的准确性,对患儿、欠合作的患者、卧床患者以及大数量患者普查等,KM-500具有它的独特优点.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:通过比较手提式角膜曲率仪KM-500 AUTO KERATOMETER(以下简称KM-500)与传统台式角膜曲率仪(OM-4)的特点及准确性,评价KM-500手提式角膜曲率仪的临床应用价值.方法:83例108只眼白内障患者,术前分别应用手提式角膜曲率仪KM-500,台式角膜曲率仪OM-4测量角膜中央曲率的最大值、最小值.结果:两种检测仪所测得的角膜曲率的最大值、最小值均无显著性差异(P＞0.05).结论:应用手提式角膜曲率仪KM-500进行角膜曲率测量具有与传统台式角膜曲率仪OM-4一样的准确性,对患儿、欠合作的患者、卧床患者以及大数量患者普查等,KM-500具有它的独特优点.
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.
