Axial Length Percentile Chart for Children
How to interpret it safely
Short answer: Axial-length percentile shows where a child’s eye length sits compared with peers, but it is not enough by itself. A high percentile, fast measured growth, young age, family history, and treatment response together tell the clinical story.
What percentile means
An axial-length percentile compares a child’s measured eye length with an age- and sex-matched reference population. A child near the 90th or 95th percentile has longer eyes than most peers, but risk interpretation still depends on refraction, age, and whether the eye is continuing to elongate quickly.
Percentile vs growth rate
| Finding | Interpretation |
|---|---|
| High percentile, stable growth | Structural risk may be elevated, but treatment response may be acceptable if follow-up growth is slow. |
| Average percentile, fast growth | May still need careful monitoring because trajectory can worsen before percentile looks alarming. |
| First visit only | Use percentile as a baseline estimate; do not over-interpret growth rate until a follow-up measurement exists. |
| Short interval follow-up | Very short intervals can exaggerate measurement noise; repeatable biometry matters. |
Minimum data to plot responsibly
- Age and sex
- Axial length OD and OS
- Visit date and measurement device when available
- Prior axial length and interval for true growth-rate interpretation
- Current treatment and treatment start date for response tracking
Plot axial length in MyopiaTracker
Enter current and prior axial length to see percentile, measured growth, projected trajectory, and parent-friendly explanation.
Open the axial-length tool →Educational only. Percentiles support clinical interpretation but do not diagnose disease or replace examination by a qualified eye-care clinician.