Clinical Publications

MYAH

Repeatability and agreement of the MYAH and Lenstar

AUTHORS:

Lal B., Cantrell A., Ostrin L.A.

PUBLICATION:

Optom Vis Sci. 2024 Mar 1;101(3):157-163. doi: 10.1097/OPX.0000000000002113

Study Purpose

To investigate intersession repeatability of the MYAH optical biometer and corneal topographer and examine agreement with the Lenstar LS900 optical biometer in healthy young adults

Overview

Study Design

Prospective study

# of Eyes/
Patients

Right eyes of 40 subjects (mean age, 25.2 ± 3.1 years) measured at two visits, 2 to 4 days apart, scheduled during a similar time window to account for diurnal variation

Study Device

MYAH (Topcon Healthcare Inc., Tokyo, Japan)
Lenstar LS900® (Haag Streit, Köniz, Switzerland)

Outcome Measures

Intrasession agreement between each device for measurement of axial length, corneal power, white-to-white distance, and pupil diameter and intersession repeatability of the 2 devices

Results

Good agreement between the MYAH and Lenstar for all parameters, although significant differences were found between the MYAH and Lenstar for axial length (−0.01 ± 0.03 mm, p=0.004), white-to-white distance (−0.13 ± 0.15 mm, p0.05 for all)
MYAH and Lenstar demonstrated good intersession repeatability (Table 1)

IMOvifa reduced measurement time by

39%

TABLE 1

TABLE 1.

CoV, ICC with 95% CI), and the P value for ocular parameters measured at visit 1 and visit 2 for the MYAH and Lenstar. Adapted from Optom Vis Sci. 2024 Mar 1;101(3):157-163.

TABLE 2

TABLE 2.

Mean difference, 95% LoAs, and the p value for ocular parameters measured with the MYAH and Lenstar. Adapted from Optom Vis Sci. 2024 Mar 1;101(3):157-163.

Conclusions

• This study found good agreement between the MYAH and Lenstar for measuring axial length, corneal power, and white-to-white distance in young adults • The study also showed high intersession repeatability of the MYAH for all measured parameters, although caution should be exercised for comparing pupil diameter across sessions, likely due to its dynamic nature • These findings support the use of the MYAH in research and clinical practice