About Myopia Management Tracker

Myopia Management Tracker (myopia-tracker.com) is an interactive, color-coded axial length tool built to be one of the easiest methods to track axial length–based myopia control and myopia management. Enter biometry and instantly see OD/OS on sex- and ethnicity-specific percentile growth charts—with color bands, plain language results, and optional LT/AL buffering plus a Bennett crystalline lens power calculator. Provided by Guildford Eye Clinic.

Who this site is for

• Optometrists and ophthalmologists monitoring childhood myopia progression with optical biometry
• Myopia management clinics educating parents about axial length, percentiles, and treatment goals
• Families reviewing AL measurements with their eye-care professional (not a substitute for clinical care)

Interactive and color-coded — easy AL-based tracking

Static tables and raw biometry printouts are hard for parents (and busy clinics) to interpret. Myopia Management Tracker is interactive: change age, sex, ethnicity, or OD/OS axial length and the graph updates immediately. It is color-coded so risk zones and percentile bands read at a glance—green through amber to red—making it one of the easiest ways to track and explain axial length–based myopia control without hunting through paper charts.

• Interactive inputs — no software install; enter measurements and see results in one click
• Color-coded percentile bands — visual map from lower-risk to higher-risk AL for age/sex/ethnicity
• Clear takeaways — percentile, mm vs P50, untreated outlook, and combo-treatment prompt at ≥ 90th percentile
• Parent-friendly printout — B&W graph plus key numbers for chairside education

What the calculator does

Axial length is a core metric in modern myopia management because elongation of the eye is tightly linked to progressive myopia and long-term risk of pathologic complications. Population percentile growth charts help place a single AL value in context of age, sex, and ethnicity—similar to height and weight charts used in pediatrics.

• Plot OD and OS axial length on a color-coded percentile graph (P5–P95)
• Compare to the age-matched P50 (median) in mm
• Show an illustrative untreated projection to age 18 and the 26 mm high-myopia risk line
• Flag ≥ 90th percentile with a combo-treatment recommendation prompt for clinical discussion
• Optional AL/CR and LT/AL buffering bands when corneal radius and lens thickness are entered
• Separate modified Bennett lens power page with age-adjusted buffer minima (cycloplegic SE, ACD, LT, AL, mean K)
• Print graph mode for B&W clinic printers (graph + key numbers only)

Ethnicity-specific axial length charts

Mean axial length trajectories differ between European and East Asian pediatric populations. This tool lets you choose the reference that best matches the child:

• European: Tideman et al. European children AL growth percentiles (sex-specific anchors; intermediate ages interpolated)
• East Asian (Chinese-reference): Sanz Diez et al. LMS percentiles for Chinese schoolchildren in Wuhan (ages 6–15; light extension for display beyond table range)

Ages under 6 can still be plotted using linear extrapolation of the published curves, with an on-screen warning that estimates are less accurate than in-range values.

Clinical framing (educational)

• Percentiles ≥ 50th are often discussed as higher myopia risk; ≥ 75th as higher risk of high myopia in published growth-chart practice narratives
• A common structural goal in myopia control is to keep AL under 26 mm where possible
• LT/AL: > 0.14 still some buffering left; 0.13–0.135 buffer running low; < 0.126 buffering completely gone (clinic teaching bands on this site)
• Crystalline lens power: remaining buffer is judged with age-adjusted Bennett minima — ages 6–9 depleted at ≤ +18.5 D (typical ~+21 to +23 D); ages 10–13 at ≤ +17.0 D; ages 14–18 at ≤ +15.5 D (biological floor)

Scientific sources

• Poon N. Axial Length: An Essential for Myopia Management. BC Doctors of Optometry.
• Tideman JWL, et al. Axial length growth and the risk of developing myopia in European children. Acta Ophthalmol. 2018.
• Sanz Diez P, et al. LMS parameters, percentile, and Z-score growth curves for axial length in Chinese schoolchildren in Wuhan. Sci Rep. 2022;12:4850.
• Hernandez VM, et al. Calculation of crystalline lens power using a modification of the Bennett method. Biomed Opt Express. 2015;6(11):4501–4515.
• Related: Diez et al. 2019; He et al. 2023 AL/AL-CR percentiles; IMI clinical management guidelines.

Important limitations

This website is an educational tool, not a regulated medical device and not a diagnosis. Percentile curves are population references, not pure emmetrope-only norms. Untreated projections use simplified literature growth-rate bands and are not individualized predictions. Always interpret optical biometry in the full clinical context with a licensed practitioner.

About Guildford Eye Clinic

This tool is provided for educational use in association with Guildford Eye Clinic. Practitioners and patients seeking myopia management and pediatric eye care can visit the clinic website for services and appointments.

Frequently asked questions