For any comparison to be made there must be at least two things to compare. For you to notice eye strain you must be able to experience relaxed eyes. The opposite is also true. If your eyesight has worsened over the years then you probably have not noticed how gradual the strain has become, and what is more, not noticed how relaxed your eyes were. The mild pressure that is used in this eye exercise directs a surge of oxygen to your eyes and also help to moisten dry eyes. Before doing this exercise be aware that you must not strain too hard. You want to oxygenate the visual system, not apply too much pressure causing damage.
Frst, sit comfortably with good posture. Take in a deep breath and close the eyes very tightly, shutting the lids firmly, and squeezing. Contract all the muscles in your face and clench your fists. Concentrate on the tension and hold for 3 seconds. Remember, do not force too hard that it becomes uncomfortable.
Now exhale letting all the air out of your lungs and relax all the muscles in your body. Notice the difference between the tension and relaxed state. You will notice that your vision has become clearer. Do this for one minute each day and notice the difference!