Comparison of IOL Master 700 and Tomey OA-2000 biometers in ocular biological parameters of children
Objective To compare the differences and consistency of Tomey OA-2000 applyingwith the conven-tional intraocular lens(IOL)master 700 biometers applying swept optical coherence tomography in terms of the ocular bio-logical parametersin children.Methods In this prospective study,a total of 163 cases(326 eyes)of children aged 4～12 years who were registered for refractive development in our hospital in September 2021 were selected.Ocular biological measurements were taken byTomey OA-2000 and IOL Master 700 respectively to obtain biological parameters including axial length(AL),central corneal thickness(CCT),central anterior chamber depth(ACD),lens thickness(LT),corneal flat curvature(Kf),corneal steep curvature(Ks),corneal transverse diameter(WTW),and pupil diameter(P).The Paired t-test,Pearson correlation analysis,and Bland Altman method were used to compare the two instruments for the eight bio-logical parameters.Results The detection rates of AL,CCT,ACD,LT,Kf,and Ks were 100%for both IOL Master 700 and Tomey OA-2000.The detection rate of WTW with IOL Master 700 and Tomey OA-2000 were 99.40%and 98.79%,The average differences between IOL Master 700 and Tomey OA-2000 for AL,CCT,ACD,LT,Kf,Ks,WTW,and P were(-0.0059±0.13)mm,(12.37±7.20),(-0.017±0.076)mm,(-0.075±0.078)mm,(-0.043±0.25)D,(-0.055±0.42)D,(-0.016±0.58)mm,and(0.081±1.01)mm,respectively.(t=-0.809,31.053,-3.947,-17.185,-3.106,-2.367,-0.501,-1.457;P=0.419,0.001,0.001,0.001,0.002,0.019,0.617,0.146).The Pearson's correlation analysis showed that there were high correlations in the measurement of AL,CCT,ACD,LT,KfandKs,while there were moderate correlations in WTW and P(all P<0.001).The consistency of these two biometrics instruments was analyzed by Bland-Altman,and showed good consistency within 95%LoA.Conclusions Compared to the standard biometric instrument IOL-Master 700 in the measurement of the biological parameters of the children,the novel biometric instrument Tomey OA-2000 makes no difference and show good consistency in most of the biological measurements.The two instruments show good consistency in most of the biological measurements,especially the values of Al can be interchangeable between the instruments.The two devices can be used simultaneously for screening refractivedevelopment in children to improve screening efficiency.
IOL Master 700Tomey OA-2000Axial lengthOcular biological parametersRefractive development
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