Clinical Publications

MYAH

The repeatability and agreement of ocular parameters measured with the MYAH and Myopia Master devices between expert and non-expert practitioners

AUTHORS:

Ortiz-Toquero S., Sanchez I., Gurrea C., Recio A., Balsa D., Martin R.

PUBLICATION:

Life. 2024 Mar 19;14(3):407. doi: 10.3390/life14030407

Study Purpose

To analyse the repeatability and agreement between expert and non-expert practitioners in ocular parameters measured by the MYAH and Myopia Master

Overview

Study Design

Prospective cross-sectional study

# of Eyes/
Patients

42 right eyes of 42 patients; mean age of 24.7± 5.80 years (range 19 to 38 years) and a mean spherical equivalent refractive error of -2.18 ± 1.88 D (range −0.25 to −6.00 D)

Study Device

MYAH (Topcon Healthcare Inc., Tokyo, Japan)
Oculus Myopia Master® (Oculus GmBH, Wetzlar, Germany)

Outcome Measures

Intraobserver repeatability and the interdevice and interobserver agreement of relevant biometric eye parameters: axial length (AL), flat (K1) and steep (K2) corneal curvature, and white-to white (WTW) distance

Results

The intraobserver repeatability was practically identical in all parameters between the expert and non-expert with both the MYAH and the Myopia Master devices. AL measurements showed the best repeatability results with the MYAH and Myopia Master (ICC = 1.0; CV ≤ 0.06% for both observers), while the WTW distance presented poorer results (ICC ≤ 0.991; CV ≤ 0.52%)
For interdevice agreement, AL measurement showed a non statistically significant difference (p ≥ 0.10) between the MYAH and Myopia Master in both the expert and and non-expert observer
The Myopia Master significantly underestimated (p ≤ 0.01) K1 and K2 (providing flatter or lower corneal power) and WTW distance values compared with the MYAH
For interobserver agreement, a high correlation between the measurements of the expert and the non-expert observer was found for all variables (Figure 1)

IMOvifa reduced measurement time by

39%

FIGURE 1

FIGURE 1.

Summary of AL (axial length), K1 (flat keratometry), K2 (steep keratometry), and WTW (white-to-white) distance measured by expert and non-expert observers with MYAH and Myopia Master. The paired t test p value and 95% confidence interval are presented. Adapted from Life. 2024 Mar 19;14(3):407.

Conclusions

• The MYAH and Myopia Master are highly repeatable devices that provide consistent measurements of the AL, K1, K2, and WTW distance in a healthy adult population regardless of the previous clinical practice experience of the observer who performs the measurements • The agreement between both instruments was excellent for AL measurements by both the expert and the non-expert observer, which indicates that the measurements could be used interchangeably • The measurements of corneal curvature and WTW distance provided by both devices could be used interchangeably with caution in clinical practice (though not in research) because both devices provide significantly different outcomes