Clinical Publications

MYAH

Comparison between IOL MASTER 500 and MYAH with vector analysis in low and mild anterior corneal astigmatism

AUTHORS:

Camellin U., Franchina F., Latino G., Ninotta I., Palino P., Meduri A., Aragona P.

PUBLICATION:

Eur J Ophthalmol. 2024 Jul;34(4):1046-1052. doi: 10.1177/11206721231210895. Epub 2023 Nov 3.

Study Purpose

To evaluate the agreement between two biometers in measuring axial length, keratometry, and anterior corneal astigmatism

Overview

Study Design

Prospective, single-center, cross-sectional study

# of Eyes/
Patients

40 eyes (right eye 25, left eye 15) of 40 patients; mean age of 32.15 ±7.38 years (range from 22 up to 42 years)

Study Device

MYAH (Topcon EU, Visia Imaging, Japan)
IOL Master 500 (Carl Zeiss Meditec AG, Germany)

Outcome Measures

Agreement of the 2 devices for measurements of axial length (AL), keratometry (K1, K2), and anterior corneal astigmatism (ACA). AL, mean K(Kavg), and magnitude of ACA were compared

Results

Mean and standard deviation with IOL Master 500 and with MYAH device was for AL 24.25 ± 1.22 mm and 24.45 ± 1.22 mm (p = .99), for Kavg 42.75 ± 1.53 D and 42.85 ± 1.52 D (p = .78), for the magnitude of ACA 1.00 ± 0.58 D and 0.89 ± 0.56 D (p = .38) respectively
Bland-Altman analysis of the two devices found high agreement and absence of proportional bias were found between the two assessments for AL (bias=−0.0005 mm, p=.93), Kavg (bias=0.0955 D, p=.76) and ACA (bias=0.11 D, p=.41). Limit of agreement (upper/lower LoA, 95%CI) were respectively +0.057/−0.058 mm for AL,+0.29/ −0.09 D for Kavg and +0.49/−0.27 D for ACA
ACA polar vectorial analysis between IOL Master 500 and MYAH demonstrated a small difference that is not statistically significant for the magnitude of error (0.11 D) with an angle of error between −5° to +5°in 55% of eyes; 28% of eyes were between −5° to−15°

IMOvifa reduced measurement time by

39%

TABLE 1

TABLE 1.

Adapted from Eur J Ophthalmol. 2024 Jul;34(4):1046-1052. doi: 10.1177/11206721231210895. Epub 2023 Nov 3.

Conclusions

• The authors report that no differences were found between MYAH and IOL Master 500 in terms of AL, Kavg, K flat, K steep and ACA in their study • The instruments appear to be interchangeable for measurements of AL, keratometry, and magnitude of ACA with high agreement between the two devices. Also, in the presence of low astigmatism, the two instruments give the same results in terms of ACA