Easily calculate and keep track of diopters with the smart Myopia calculator:
INSTRUCTIONS
Take off your glasses.
Press the green button on the bottom right and select one of the options - Left eye, Right eye or Both eyes.
On next screen, look straight at the screen and then click on the CALIBRATE button (you should be able to see three colored squares on the screen near the eyes ).
Now focus on the text above the camera view.
Move your head away from the screen to find where the text on the screen just barely start to blur.
Now click on the DONE button.
In case you still need to back off but your arm is stretched completely, just use the TIMER instead of the DONE button. ( the timer will click the done button for you after a specified time)
Once done, you can view the results and repeat the same for another eye.
Save the results and use it to track your diopters.