Comparison of ocular variables obtained from Tomey OA-2000 and IOLMaster / 眼科新进展

ABSTRACT

Objective To compare the ocular parameters measured by 2 biometry devices Tomey OA-2000 and IOLMaster in cataract eyes.Methods A total of 74 cataract patients (74 eyes) were included in this prospective study.Ocular parameters,including axial length (AL),keratometry (K),anterior chamber depth (ACD) and white to white (WTW),were obtained from Tomey OA-2000 and IOLMaster,respectively.Paired t-test was applied to analyze the differences of ocular parameters from Tomey OA-2000 and IOLMaster,while Bland-Altman plot was used to assess the agreement of these ocular parameters.Results The AL,flat K,steep K,mean K,central corneal thickness (CCT),ACD,lens thickness,pupil diameter and WTW values measured by Tomey OA-2000 were (24.26 ± 2.71) mm,(44.09 ± 1.76) D,(45.01 ± 1.73) D,(44.55 ± 1.72)D,(518.41 ±34.18) μm,(3.07 ±0.48)mm,(4.48 ±0.61)mm,(4.07 ±0.95)mm and (11.50 ± 0.52)mm respectively.Values of AL,flat K,steep K,mean K,ACD and WTW from IOLMaster were (24.33 ± 2.69) mm,(44.21 ± 1.74) mm,(45.15 ± 1.76) D,(44.69 ± 1.74) D,(3.04 ± 0.46)mm and (11.65 ± 0.41) mm respectively.The difference values of AL,flat K,steep K,mean K,ACD and WTW between Tomey OA-2000 and IOLMaster were (-0.07 ±0.10) mm (t =-5.99,P＜0.01),(-0.12 ± 0.21) D (t =-4.14,P＜0.01),(-0.14 ± 0.20)D (t =-5.88,P＜0.01),(-0.12 ±0.13) D (t =-7.44,P＜0.01),(0.03 ±0.14) mm (t=1.99,P=0.05) and (-0.14±0.32) mm (t=-3.73,P＜0.01) respectively.The 95％ limits of agreement (LoA) of the AL,flat K,steep K,mean K,ACD obtained from the two devices was 0.27 mm,0.50 D,0.53 D,0.38 D,0.30 mm,respectively,and the agreement was good;95％ LoA of WTW was 0.78 mm,and the consistency was poor.Conclusion The differences of AL,K values and ACD between Tomey OA-2000 and IOLMaster were small,suggesting the agreement is unified.