November 1, 2025 By Thomas Naduvilath, Msc Biostatistics, PhD, Head of Biostatistics at BHVI Axial length (AL) measurements are gaining importance as a robust metric to evaluate and monitor myopia progression. Techniques to measure AL are non-invasive, rapid and do not require cycloplegia. Elongation of AL is routinely measured in research studies to assess the efficacy of myopia control treatments.