MyopiaProgression.com · Teaching guide
VISUAL GUIDE 3 / 3
Measured change, rate and treatment effect are different
Two comparable visitsLater value − earlier value
A measured difference in the same eye and metric.
Put time beside the differenceChange ÷ actual elapsed time
An interval-based rate. A short interval is not a measured full year.
The untreated path was not measured in that child.
Do not claim an exact individual treatment percentage using a guessed counterfactual.
