These etiologies were tested by altering parameters (sensory, controller and plant gains) in the Simulink model of accommodation. 
Simulink
Predictions were then compared to the static and dynamic blur accommodation (BA) measures taken using a Badal optical system on 12 children (6 emmetropes and 6 myopes, 8-13years) and 6 adults (20-35years). 
Badal optical system