age:20i want 2 ask about use of spectacle.i'm shortsightness, b4 age 15, my eyes is normal. may be bcoz i don't take care my eyes.even though i'm shortsightness, but i still not use spectacle 4 24 hours.i will use spectacle, when i want 2 drive, learning, important thing.Q: how to use spectale with right way? is it have a side effect use spectacle with long time period? if i use spectacle 24 hours, is it will be increase my shortsightness?