The precision and agreement of corneal thickness and keratometry measurements with SS-OCT versus Scheimpflug imaging

Eye and Vision
Yune ZhaoChenyang Mei

Abstract

To assess the repeatability and reproducibility of swept-source optical coherence tomography (SS-OCT) and Scheimpflug system and evaluate the agreement between the two systems in measuring multiple corneal regions in children. Pachymetric and keratometric maps for both systems were evaluated. Central, midperipheral and peripheral corneal thickness (CT), keratometry and astigmatism power vectors were recorded. The three outcomes yielded by the same observer were used to assess intraobserver repeatability. The differences in the mean values provided by each observer were used to evaluate interobserver reproducibility. Within-subject standard deviation, test-retest repeatability (TRT) and coefficient of variation (CoV) were used to analyze the intraobserver repeatability and interobserver reproducibility. Paired T-test and Bland-Altman were used to appraise interdevice agreement. Seventy-eight eyes of 78 children were included. The CoV was ≤2.12 and 1.10%, respectively, for repeatability and reproducibility. TRT and CoV were lower for central and paracentral CT measurements than for peripheral measurements. The SS-OCT device generated higher precision when acquiring CT data, whereas Scheimpflug system showed higher reliability whe...Continue Reading

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Citations

Nov 12, 2020·Biomaterials Science·Zoe HancoxFarshid Sefat
Oct 9, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Sayantan Biswas, Partha Biswas

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