An investigation on the correlation between axial length values obtained via Lenstar LS900 and axial length estimator

Background: Myopia, commonly known as nearsightedness, is associated with excessive eye elongation, leading to impaired distance vision. Recognizing axial length (AL) as a crucial parameter in managing myopia has prompted this study. The Axial Length Estimator Software (ALE) by CooperVision offers a cost-effective alternative for measuring AL, particularly for optometry centres that cannot afford biometry instruments. However, there is a lack of studies investigating the correlation between AL values acquired through the Lenstar LS900 (Haag-Streit, Bern, Switzerland) and ALE. This study aimed to determine the correlation of AL values between Lenstar LS900 and ALE, investigate any significant differences between the AL values obtained via both methods and explore any gender-related differences in AL values measured by each method. Methods: In this cross-sectional study, the AL of 99 participants (emmetrope and myope) were measured using Lenstar LS900 and compared to AL values obtained from the ALE. Estimating AL using ALE requires obtaining corneal curvature and refractive power values. For this purpose, corneal curvature was measured using the Oculus Keratograph 5M (OK5M, Oculus, Wetzlar, Germany), while refractive power was determined through subjective refraction assessments. Results: The AL values obtained via both methods showed a strong positive correlation. No statistically significant differences in AL between both methods were observed. There were also no statistically significant gender-related differences in the AL values obtained by either method. Conclusion: The AL values obtained via both methods exhibited a strong positive correlation with no statistically significant differences. Further validation studies are required to confirm the accuracy of ALE across diverse populations and clinical settings.