Agreement Analysis Of Four Optical Devices For Measuring Thinnest Point Pachymetry
Published 2024 - 42nd Congress of the ESCRS
Reference: PO288 | Type: Poster | DOI: 10.82333/e3x4-y106
Authors: Ramin Salouti* 1 , M. Hossein Nowroozzadeh 1 , Ali Azizi 2 , Amir Khosravi 1 , Kia Salouti 3 , Maryam Ghoreyshi 2 , Zahra Tajbakhsh 4
1Department of Ophthalmology,Shiraz University of Medical Sciences,Shiraz,Iran, Islamic Republic Of, 2Salouti Cornea Research Center, Salouti Eye Clinic,Shiraz,Iran, Islamic Republic Of, 3Science Department,The University of British Columbia,Vancouver,Canada, 4Department of Optometry,University of Western Australia,Perth,Australia
Purpose
to evaluate the agreement between four optical devices in measuring the thinnest point pachymetry (TPP) in healthy patients who were candidates for refractive surgery.
Setting
Salouti Eye Clinic, Shiraz, Iran.
Methods
This prospective comparative study included healthy patients who were referred for keratorefractive surgery. Four devices were used to measure TPP in the patients' right eyes: The Anterion, the Orbscan IIz, the Pentacam AXL, and the RTVue. The study recorded the baseline characteristics and TPP measurements from all four devices. The agreement between the devices was determined using the 95% limits of agreement (LoA), Bland-Altman plots, and the concordance correlation coefficient (CCC).
Results
The study analyzed data from 195 right eyes of 195 patients, with a mean age of 30.2±5.9 years. Of these patients, 127 (63.5%) were female. The CCC between each pair of the Anterion, Pentacam, and RTVue devices indicated substantial agreement (>0.950). In contrast, the CCC for Orbscan versus the other devices showed moderate agreement (0.900 – 0.950). The LoAs were as follows: Anterion vs. Orbscan (19.5;28.3 µm), Anterion vs. Pentacam (-0.9.3;11.2), Anterion vs. RTVue (2.6;12.5), Orbscan vs. Pentacam (-26.2;19.4), Orbscan vs. RTVue (20.2;26.5), and Pentacam vs. RTVue (-3.5;16.7).
Conclusions
According to the CCC analysis, the Anterion, Pentacam AXL, and RTVue devices showed good agreement in measuring TPP. In contrast, the Orbscan device showed only moderate agreement with the other devices. The LoAs (> 10 µm on at least one side) suggest that the devices cannot be used interchangeably for measuring TPP.