At this age the power is likely to be stable.
Regarding other problems,
Are you a regular computer user if so it might be computer vision syndrome please use lubricant eye drops e.g. teardrop 2to3 times daily and rub ocupol d's eye oint twice daily on lids
Next Steps
Follow 20.20.formula ie close your eyes for 20seconds after every 20.minutes. keep proper distance between eyes and screen. don't sit facing towards a/c or blowers .wash your eyes with freshwater frequently. consume lots of fresh fruit and vegetables.