Comparison of Corneal Keratometry Measured by Three Different Methods

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Muğla Sıtkı Koçman Üniversitesi Tıp Dergisi
Volume:11 Issue:3
Comparison of Corneal Keratometry Measured by Three Different Methods

Comparison of Corneal Keratometry Measured by Three Different Methods

Authors : Konuralp Yakar, Göksu Alaçamlı

Pages : 180-186

Doi:10.47572/muskutd.1523840

View : 28 | Download : 8

Publication Date : 2024-12-18

Article Type : Research Paper

Abstract :To compare and evaluate the interchangeability and agreement between corneal keratometry measurements (flattest-steepest keratometry, mean keratometry and corneal astigmatism) using partial coherence interferometry reflectometry optical biometry (Nidek AL Scan, 2.4–3.3 mm zones, Nidek Technologies, Gamagori, Japan), corneal aberrometer/topographer (Nidek OPD Scan II, Nidek Technologies, Gamagori, Japan) and standard autorefractokeratometer (Topcon KR 8900, Topcon Inc., Tokyo, Japan) a total of 360 right eyes of 360 healthy volunteers with a mean age of 24.37±3.91 years were enrolled in this prospective comparative study. Paired t-tests were used to evaluate pairwise comparisons. The Bland–Altman test with 95% limits of agreement was used to evaluate the agreement between the three devices. There were no statistically significant differences between all keratometric values of the Nidek AL Scan obtained in the 2.4 and 3.3 mm zones (p>0.05). There were no statistically significant differences in AstK values between the Nidek AL Scan (2.4 -3.3 mm zone) and the Nidek OPD Scan II pairwise comparisons (p>0.05). When the K1, K2, and Kmean values measured with the Nidek OPD Scan II and Topcon KR 8900 were compared with the Nidek AL Scan (2.4 -3.3 mm zone), a statistically significant difference was found (p<0.05). AstK values were also statistically different between Topcon KR 8900 versus Nidek AL Scan (2.4 -3.3 mm zone) and Nidek OPD Scan II (p<0.05). Only the Nidek AL Scan provided comparable measurements for all keratometric parameters analyzed in the 2.4 and 3.3 mm zones. The LoA obtained for each inter-device agreement should be analyzed carefully to consider the interchangeability of these three devices.
Keywords : AL Scan, Biyometri, Keratometri, OPD Scan, Topcon Otorefraktometre

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