Blurr vision n dry eyes. Quick recovery!

Past 2 yrs my 17 yr( current) son has blurr eyesight issues,obvious bcoz of mobile.gt tested n wearing glasses now since then.actually when first tym got tested by a lady Dr opthamologist,she gave wrong info after testing but v beleivd her obviously n got tht no's glasses which he worn fr a yr.during second diagnos same lady Dr told that her receptionist mistake might be but wrong info was given due to which my sons eye got more spoiled wearing wrong glasses.unfortunately  couldnt do anything but took other Drs decision n finally got new glasses with correct info now.problem is still after six months almost my son couldnt see persons features,car nos etc. from distance n has dry eyes,head pains.hes fit otherwise,eats good home cookd food only,few veggies n mostly nn veg.pls suggest what treatment n diet or healthy vision practices should v develop in him.already hes under medication for coupl of months coz of acne type 2 n dry skin.kindly suggest som good options for quick recovery