Myopic power is inherited from either mother or father side & is basically hereditary in nature ,maximum increase in myopic power takes place between 13 to 21 yrs in male & between 13 yrs to 19 yrs in female because maximum body growth takes place between these periods. There is no direct medicine to check the increase in myopic power but with the help of balanced diet ,green vegetables & seasonal fruits  one can slow the speed in the increase of myopic  power,one can take the help of yoga pranayam, swimming, gym &these things definitely slow the speed of increase in myopic power.

Depends on what the power of the eye glasses is . If minor, you can use the glasses whenever required. However if vision worth our the glasses is blurred, you are better off wearing them constantly as straining to see clearly without your spectacles could further cause your number to increase. Maskatieyeclinic opposite Charni road station east , Mumbai

yulou must use glasses regularly.