Dear mallgirl12,
It is common for children at this age to undergo changes in the prescription. There is some recent evidence that showed an increased in prevalence of nearsightedness as compared with two decades ago, suggesting that an increase of near work associated with working on the computer, longer schooling and activities such as texting might be contributory. Perhaps, taking frequent breaks while you are on the computer and looking around the room at a distance object might help. I would also recommend that you go outside and perform exercise and partake in distance activities.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California