Mine power is -6.0 and -5.50 i went for a checkup two days ago my doctor suggested to wear the same spectacles i am wearing right now even though there was space to increase my power, i feel abit blur even with a glasses and i am gonna do this exercise daily and gonna update it's already day 3 and i feel abit of good vibes from it i can't say i have any improvement. After a month I can feel that there's a difference I can focus on more easily than before I will go for a checkup after a few months and then tell you the exact result