Repeatability and agreement of two A-scan ultrasonic biometers and IOLMaster in non-orthokeratology subjects and post-orthokeratology children

Clinical & Experimental Optometry : Journal of the Australian Optometrical Association
Ben ChanSin-Wan Cheung

Abstract

Our aim was to determine the repeatability of measurements of axial length (AL) and anterior chamber depth (ACD) made with two ultrasonic biometers and the IOLMaster in a group of non-orthokeratology (ortho-k) adult subjects and to investigate the agreement among instruments in children undergoing ortho-k therapy and in children wearing spectacles. To determine repeatability, AL and ACD were measured twice in 22 non-ortho-k young adults using two A-scan ultrasonic biometers (A-5500 and A-2500) and the IOLMaster. To determine agreement, AL and ACD were measured with the same instruments in 30 children undergoing ortho-k therapy and 30 spectacle-wearing children. In the adult subjects, there were no significant differences in ACD and AL measurements obtained from the three instruments (repeated measures ANOVAs, p > 0.05). There was also no significant between-measurement difference for each instrument. The between-measurement agreement was better for the IOLMaster (95% limits of agreement (LA): -0.04 and +0.05 mm for both AL and ACD) than for the two A-scan ultrasonic biometers (95% LA: -0.12 and +0.11 mm for AL; -0.22 and +0.27 mm for ACD). Among the children, AL measurements with all three instruments were not significantly dif...Continue Reading

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Citations

Mar 23, 2013·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Jessie Charm, Pauline Cho
May 2, 2007·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·J JorgeM A Parafita
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Mar 1, 2019·Investigative Ophthalmology & Visual Science·Christine F WildsoetJames S Wolffsohn
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Apr 23, 2019·Eye & Contact Lens·Kate L GiffordKatrina L Schmid
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Apr 5, 2014·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Richard A Armstrong
Dec 5, 2019·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Kate L GiffordKatrina L Schmid
Nov 20, 2021·Investigative Ophthalmology & Visual Science·Kai Yip Choi, Henry Ho-Lung Chan
Oct 6, 2021·Eye & Contact Lens·Jennifer DrechslerJanet Leath Alexander

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