Press the green flag to start or restart and the red stop button to completely stop the model. If the red stop button is pressed, starting over from the green flag must be done. These buttons are located at the top of the screen on the left hand side. On the right hand side is a button with arrows protruding which enlarges the simulation. Press the start button to ‘START’ to start the simulation, the ‘BACK’ button to backtrack and the ‘MODEL’ button to view a visualisation of the information. When the ‘MODEL’ button is pressed, click ‘NEXT’ to view a second model and ‘BACK’ to go back to the page prior to viewing the model. Step ‘2’ applies when the second ‘MODEL’ button. When next is pressed however, the user is provided with an ‘INFO’ button explaining the model further, and how certain elements prove the effectiveness of prescription spectacles. Press ‘END’ to end the simulation and if desired, press ‘RESTART’ to start from the beginning.
