This is a simple exercise and is important to do if you are finding your eyes losing function when working at a computer for extended periods of time.
You will require:
something you can see that is more than 6 metres away
If you need to wear glasses to focus, wear them while doing this exercise. Your eye will do more work if it is able to get a clear focus and doing the work is what strengthens the muscles.
If your eyesight is too poor to focus on a distant object, use an object as far away as you can still focus on.
Time: 30 seconds or so. At least once per day. Preferably every hour while doing computer work.
Step 1: Finding the right distance.
Cover one eye with your hand and look at something level with your eye and as far away as possible. Preferably at least 6 metres.
Raise the pen in your hand until the tip of the pen blocks what you are looking at..
Focus on the very tip of the pen now.
Move the pen, still pointing up to the ceiling, closer towards your eye until it is too close to focus on.
Move it back away from your eye until it comes into focus again.
The distance the pen is from your eye now, is the distance to use for the exercise. Keep the pen in this position.