中华眼视光学与视觉科学杂志
中華眼視光學與視覺科學雜誌
중화안시광학여시각과학잡지
CHINESE JOURNAL OF OPTOMETRY OPHTHALMOLOGY AND VISUAL SCIENCE
2014年
9期
557-561
,共5页
潘超%黄锦海%华焱军%谭维娜%鲁伟聪%王勤美
潘超%黃錦海%華焱軍%譚維娜%魯偉聰%王勤美
반초%황금해%화염군%담유나%로위총%왕근미
Scheimpflug%角膜屈光力%角膜地形图%光路追迹法%重复性%准确性
Scheimpflug%角膜屈光力%角膜地形圖%光路追跡法%重複性%準確性
Scheimpflug%각막굴광력%각막지형도%광로추적법%중복성%준학성
Scheimpflug%Corneal refractive power%Corneal topography%Ray tracing%Repeatability%Accuracy
目的 采用Sirius眼前节全景仪2种方法获得近视患者角膜屈光力,评估其重复性与准确性.方法 前瞻性研究.52例(52眼)接受LASIK术前检查的近视患者,平均年龄为(21.6±4.8)岁,平均等效球镜度为(-4.8±2.1)D;分别应用Keratron角膜地形图仪和Sirius眼前节全景仪测量角膜屈光力,每只眼连续测量3次.Keratron提供角膜模拟屈光力Km,Sirius提供2种角膜屈光力:角膜模拟屈光力Sim K和不同入瞳直径下光路追迹法获得的入瞳角膜屈光力(MPE).变异系数、Cronbach's Alpha系数及组内相关系数评估Sirius获得的角膜屈光力的重复性;采用重复测量方差分析比较Sirius获得的Sim K、MPE与Keratron获得的Km之间的差异;采用Pearson相关分析Sim K、MPE和Km之间的相关性,Bland-Altman图评估Sim K、MPE和Km之间的一致性.结果 Sim K、MPE3、MPE4、MPE4.5、MPE5、MPE6、MPE7、Km分别为(42.91±1.52)D、(42.25±1.50)D、(42.42±1.52)D、(42.52±1.52)D、(42.63±1.55)D、(42.87±1.57)D、(43.11±1.60)D、(42.99±1.50)D.Sirius测量的所有参数变异系数均小于1%,Cronbach's Alpha系数和组内相关系数均大于0.99.Sim K比Km平均小0.08 D,差异有统计学意义(t=4.11,P<0.01).MPE3比Km平均小0.74 D,差异有统计学意义(t=32.00,P<0.01).Pearson相关分析显示Sim K、MPE与Km均有密切的相关性(r均>0.98,P<0.01).Bland-Altman图显示Sim K与Km、MPE3与Km的95%一致性区间分别为(-0.35 D,0.19 D)、(-1.07 D,-0.41 D).结论 Sirius 2种方法获得的近视患者角膜屈光力具有很好的重复性.Sim K和Km具有很好的一致性,可以替代使用.光路追迹法获得的角膜屈光力明显低于Km,不能直接代入IOL计算公式.
目的 採用Sirius眼前節全景儀2種方法穫得近視患者角膜屈光力,評估其重複性與準確性.方法 前瞻性研究.52例(52眼)接受LASIK術前檢查的近視患者,平均年齡為(21.6±4.8)歲,平均等效毬鏡度為(-4.8±2.1)D;分彆應用Keratron角膜地形圖儀和Sirius眼前節全景儀測量角膜屈光力,每隻眼連續測量3次.Keratron提供角膜模擬屈光力Km,Sirius提供2種角膜屈光力:角膜模擬屈光力Sim K和不同入瞳直徑下光路追跡法穫得的入瞳角膜屈光力(MPE).變異繫數、Cronbach's Alpha繫數及組內相關繫數評估Sirius穫得的角膜屈光力的重複性;採用重複測量方差分析比較Sirius穫得的Sim K、MPE與Keratron穫得的Km之間的差異;採用Pearson相關分析Sim K、MPE和Km之間的相關性,Bland-Altman圖評估Sim K、MPE和Km之間的一緻性.結果 Sim K、MPE3、MPE4、MPE4.5、MPE5、MPE6、MPE7、Km分彆為(42.91±1.52)D、(42.25±1.50)D、(42.42±1.52)D、(42.52±1.52)D、(42.63±1.55)D、(42.87±1.57)D、(43.11±1.60)D、(42.99±1.50)D.Sirius測量的所有參數變異繫數均小于1%,Cronbach's Alpha繫數和組內相關繫數均大于0.99.Sim K比Km平均小0.08 D,差異有統計學意義(t=4.11,P<0.01).MPE3比Km平均小0.74 D,差異有統計學意義(t=32.00,P<0.01).Pearson相關分析顯示Sim K、MPE與Km均有密切的相關性(r均>0.98,P<0.01).Bland-Altman圖顯示Sim K與Km、MPE3與Km的95%一緻性區間分彆為(-0.35 D,0.19 D)、(-1.07 D,-0.41 D).結論 Sirius 2種方法穫得的近視患者角膜屈光力具有很好的重複性.Sim K和Km具有很好的一緻性,可以替代使用.光路追跡法穫得的角膜屈光力明顯低于Km,不能直接代入IOL計算公式.
목적 채용Sirius안전절전경의2충방법획득근시환자각막굴광력,평고기중복성여준학성.방법 전첨성연구.52례(52안)접수LASIK술전검사적근시환자,평균년령위(21.6±4.8)세,평균등효구경도위(-4.8±2.1)D;분별응용Keratron각막지형도의화Sirius안전절전경의측량각막굴광력,매지안련속측량3차.Keratron제공각막모의굴광력Km,Sirius제공2충각막굴광력:각막모의굴광력Sim K화불동입동직경하광로추적법획득적입동각막굴광력(MPE).변이계수、Cronbach's Alpha계수급조내상관계수평고Sirius획득적각막굴광력적중복성;채용중복측량방차분석비교Sirius획득적Sim K、MPE여Keratron획득적Km지간적차이;채용Pearson상관분석Sim K、MPE화Km지간적상관성,Bland-Altman도평고Sim K、MPE화Km지간적일치성.결과 Sim K、MPE3、MPE4、MPE4.5、MPE5、MPE6、MPE7、Km분별위(42.91±1.52)D、(42.25±1.50)D、(42.42±1.52)D、(42.52±1.52)D、(42.63±1.55)D、(42.87±1.57)D、(43.11±1.60)D、(42.99±1.50)D.Sirius측량적소유삼수변이계수균소우1%,Cronbach's Alpha계수화조내상관계수균대우0.99.Sim K비Km평균소0.08 D,차이유통계학의의(t=4.11,P<0.01).MPE3비Km평균소0.74 D,차이유통계학의의(t=32.00,P<0.01).Pearson상관분석현시Sim K、MPE여Km균유밀절적상관성(r균>0.98,P<0.01).Bland-Altman도현시Sim K여Km、MPE3여Km적95%일치성구간분별위(-0.35 D,0.19 D)、(-1.07 D,-0.41 D).결론 Sirius 2충방법획득적근시환자각막굴광력구유흔호적중복성.Sim K화Km구유흔호적일치성,가이체대사용.광로추적법획득적각막굴광력명현저우Km,불능직접대입IOL계산공식.
Objective To assess the repeatability and accuracy of two instruments for measuring corneal refractive power in myopic eyes:the Scheimpflug-Placido topographer (Sirius) and the Keratron topographer.Methods Fifty-two eyes of 52 pre-LASIK myopic volunteers whose mean age was 21.6±4.8 years,with an average spherical equivalent of-4.8±2.t D,were enrolled in this prospective study.Corneal refractive power was measured by both the Keratron topographer and the Sirius Scheimpflug-Placido topographer.Keratron measures Km,which is simulated keratometry; Sirius provides two kinds of corneal refractive power:Sim K and mean pupil power (MPE) under different pupil sizes using ray tracing.Three consecutive measurements were obtained.The coefficient of variation and Cronbach's alpha and intraclass correlation coefficient (ICC) were used to assess the repeatability of the Sim K and MPE obtained by Sirius.The differences between Sim K,MPE and Km were analyzed by a repeated-measures analysis of variance.Pearson correlation and Bland-Altman analysis were used to evaluate the correlation and agreement between Sim K,MPE and Km.Results The results of Km,Sim K,MPE3,MPE4,MPE4.5,MPE5,MPE6 and MPE7 were 42.91±1.52 D,42.25±1.50 D,42.42±1.52 D,42.52±1.52 D,42.63±1.55 D,42.87±1.57 D,43.11±1.60 D and 42.99±1.50 D,respectively.The coefficients of variation were lower than 1% for all parameters measured by Sirius.Cronbach's Alpha and ICC were both higher than 0.99.The Sim K averaged 0.08 D lower than Km with statistically significant differences (t=4.11,P<0.01).The MPE3 average was 0.74 D smaller than Km with statistically significant differences (t=32.00,P<0.01).Pearson analysis indicated excellent correlations (r>0.98,P<0.01).The 95% limits of agreement between Sim K and Km,MPE3 and Km were (-0.35 D,0.19 D),(-1.07 D,-0.41 D).Conclusion In myopic eyes,simulated keratometry measured by Sirius was similar to Keratron.The instruments can be regarded as clinically interchangeable.However,mean pupil power using ray tracing cannot be factored directly into intraocular lens power calculations.