Find a pencil, and mark it somewhere in the middle
Hold the pencil in front of your face, at arm's length
Focus your eyes on the mark you drew on the pencil
Slowly move the pencil toward your face, maintaining your focus on the same spot
Stop when you see two pencils
Look away for a few seconds, or close your eyes
Look back at the pencil
Slowly move the pencil away from your face
Repeat the exercise
You can search on the internet to find some eye exercise to help with your eyesight. But if they ask you to take part in and give money, don't follow that. I suggest you to walk outside to enjoy the nature. The trees and green grass are the best methods for eyes exercise. Usually our vision problems are caused by long time focus our eyes in the same distance.
If you have enough time, you can stay outside as long as you can. Stop watching TV and playing computer games are good for protecting our eyesight. Besides, you can keep a balanced diet. You can eat more green leafy vegetables and fruits that rich in vitamins. They are good for our eyes.
Actually, there are several ways to inprove your eyesight instead of wearing eyewear such as eat some food that is helpful for improve your vision, take eye excise and have a rest while working for a long time. Moreover, it is said that seeing more green trees or grass is much helpful.