Eyesight power in negative increases up to a certain age, after that it becomes constant. generally, at the age of 22-23, it becomes constant, but in some cases it may go on increasing till the age of 25.
It is difficult to decrease eyesight through natural remedies. You can go for a laser surgery after consulting to a specialist.
But, you can keep your eye healthy, and can avoid further increase in glass power by following certain things.
1. Avoid excess of tea/coffee.
2. Get a good sleep at night for at least 6 to 8 hours.
3. Have a healthy diet. Vitamin A rich foods are good for eyesight. Carrot, Milk, Spinach, and other green leafy vegetables are good for eyes.
4. Do not sit in front of computer for a long time.
5. Do not watch TV for long time. Keep a distance of minimum 6 feet while watching TV.
6. Drink plenty of water.
7. Do some exercises for eyes. Sit in a dark place and close your eyes in your palms(crossed) and stay like that for 5 minutes.
Roll your eyeballs from right to left, up and down for ten times.
and do again in other direction.
Look at some green object like plants for sometime in the morning.
Take clean water in your palm and deep your eyes and close and open the lids for sometime.