Authors: Shen Lin, Li Dongjun, Wang Ziyang, Chen Wei, Zhao Qi, Li Yifeng, Cui Rui, Yang Wenli
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Objective
To compare the agreement of axial length (AL), anterior chamber depth (ACD) and keratometry measured by IOLMaster 500 with IOLMaster 700 in cataract eyes with high myopia.
Methods
A cross-sectional study was performed.One hundred and fifty-two eyes of 87 cataract patients with high myopia were included from September to October 2017 in Beijing Tongren Hospital.The best corrected visual acuity (BCVA) was 0.05—1.0, and the refraction power was -6.25—-21.00 D, with an average power of (-13.625±7.375)D.AL, ACD and keratometry (Kf, Ks) were measured by IOLMaster 700 and IOLMaster 500 respectively for all the eyes.The eyes were assigned to AL>26—≤28 mm group, AL>28—<30 mm group and AL≥30 mm according to the results of IOLMaster 500.The measured differences between two devices were assessed using paired samples t-test, and the measured consistency of the two devices was evaluated using Bland-Altman agreement analysis.This study protocol was approved by Ethics Committee of Beijing Tongren Hospital and complied with Declaration of Helsinki.
Results
There were no significant differences in the AL and Kf measured by the two devices in all the three groups (all at P>0.05). Both ACD and Ks values measured by IOLMaster 700 were lower than those by IOLMaster 500 (both at P<0.05), which were clinically acceptable.The percentage beyond 95% agreement limit between IOLMaster 700 and IOLMaster 500 were 4.10%, 2.17% and 3.03% for AL differences and 4.10%, 4.34%和3.03% for Kf difference in the three groups.Significant differences were found in ACD and Ks between IOLMaster 700 and IOLMaster 500 at a clinically acceptable level (both at P<0.05), and Bland-Altamn agreement analysis showed that the percentage beyond 95% agreement limit between IOLMaster 700 and IOLMaster 500 were 4.10%, 4.34% and 3.03% for both ACD and Ks differences in the three groups.
Conclusions
There is a good agreement in AL, ACD, Kf and Ks measured by IOLMaster 700 with IOLMaster 500 and is clinically interchangeable in cataract eyes with high myopia.However, IOLMaster 700 is better because it can provide the OCT image of macula.