方法：观察性对照研究。对69例(138眼)近视患者由同一操作者分别使用Pentacam、IOLMaster和A型超声测量仪进行ACD测量，并对所得数据进行统计学分析。3种仪器的测量值一致性比较采用Bland-Altman检验，且用组内标准差及计算重复性系数来评价3种方法的重复性。

结果：Pentacam，IOLMaster和A型超声测量仪测得ACD值分别为(3.77±0.24)、(3.73±0.23)、(3.69±0.22)mm。Bland-Altman分析显示，3种方法测量ACD的平均值一致性较好(Pentacam vs IOLMaster：CoA 0.04mm，LoA -0.05～0.13mm； A超 vs IOLMaster：CoA 0.04mm，LoA -0.17～0.08mm； Pentacam vs A超：CoA 0.08mm，LoA -0.06～0.22mm)。组内标准差及计算重复性系数显示3种方法测量ACD的重复性好(S_w=0.03、0.02、0.03； 2.77 S_w=0.08、0.06、0.08)。3种仪器测量ACD值相互正相关(r=0.946，0.987，0.951，P<0.001)。

结论：Pentacam、IOLMaster和A型超声3种方法测量ACD的可重复性均很好、变异小、高度相关。Pentacam测得的ACD值稍大于A型超声，但由于3组数据可重复性好，变异系数小，故此差异没有重要的临床意义。

METHODS: The present study was observational in nature. ACDs were measured in 138 eyes of 69 myopic patients, by the same operator, using the Pentacam, the IOLMaster, and US. We assessed the agreement among the three methods using Bland-Altman plots. The repeatability among the three methods was evaluated by within-subject standard deviation.

RESULTS: The means±SDs of ACDs measured using the Pentacam, the IOLMaster, and US were 3.77±0.24, 3.73±0.23, and 3.69±0.22mm respectively. Bland-Altman analysis showed that Pentacam and IOLMaster data were in good agreement(CoA, 0.04mm; LoA,0.05 to 0.13mm), as were US and IOLMaster data(CoA, 0.04mm; LoA, 0.17 to 0.08mm), but the Pentacam ACD values were slightly greater than the US figures(CoA, 0.08mm; LoA, 0.06 to 0.22mm). Measurements of the ACD with the three devices also showed high repeatability(S_w=0.03, 0.02, and 0.03; 2.77 S_w=0.08, 0.06, and 0.08, respectively). The three depth estimates were positively correlated(r=0.946, 0.987, and 0.951; P<0.001).

CONCLUSION: Measurement of ACDs using the Pentacam, the IOLMaster, and US showed good agreement and repeatability. The Pentacam and IOLMaster ACDs, and the IOLMaster and US ACDs, agreed reasonably well, but agreement between the Pentacam and US data was poorer. However, both the absolute differences and the coefficients of variation were small, and the observed variability was likely not clinically significant.