Lenstar 与 A 超测量前房深度及晶状体厚度的比较

目的比较 Lenstar LS900光学生物测量仪与 A 超测量(ACD)、晶状体厚度(LT)的差异,以评价 Len-star 测量参数的准确性,为其临床应用提供依据.方法对31例(35只眼)白内障患者分别应用 Lenstar 与 A 超测量 ACD、LT,测量数据之间的差异采用配对 t 检验,一致性采用 Bland-Altamn 统计分析.结果 Lenstar 测量 ACD 为(3.047±0.384)mm,A 超为(2.853±0.397) mm,差异有统计学意义( t =2.242, P <0.05),一致性较差.测量 LT Lenstar 为(4.546±0.370) mm,A 超为(4.631±0.411) mm,差异无统计学意义( t =0.912, P ﹥0.05),一致性较差.结论 Lenstar 与 A 超的测量结果存在一定差异,在临床中应注意仪器之间的差异.

Comparision of Lenstar and A-scan ultrasound biometry in the measurement of anterior chamber depth and lens thickness

Objective Compare the differences between Lenstar and A-scan ultrasound biometry for measuring the anterior chamber depth and lens thickness in order to evaluate the accuracy of those two instruments.Methods Totally 35 eyes of 31 cataract patients were measured with both Lenstar and A-scan ultrasound biometry separately.Date were analyzed using a paired samples t test and Blant-Altman plots.Results The measurements of anterior chamber depth with Lenstar was(3.047±0.384)mm.A-scan ultrasound biometry was(2.853±0.397) mm,the difference was statistically significant(t=2.242,P<0.05).The measurements of lens thickness with Lenstar was(4.546±0.370) mm,A-scan ultrasound biometry was(4.631±0.411) mm,the difference was not statistically significant(t=0.912,P﹥0.05).The Bland-Altamn showed that the two decices had non-comparable results for anterior chamber depth and lens thickness.Conclusion Attention should be paid to the differences between Lenstar and A-scan ultrasound biometry in clinical practice.The two device may not be directly substituted for each other.