The images appear zig zag after the eyes are rubbed. If the eyes are  rubbed normally this situation do not takes place. But if the eyes are  rubbed with full force, the pressure is fallen on the muscles of the  eyes, pupil, and connective tissue and on the eye lenses. This is called  as the mechanical stress. This means, the balanced structure which is  seen inside the parts of the eye will be damaged temporarily.  At that  stage, the light rays which passed in to the eyes, do not travel in  their normal position. The eye ball does not concentrate totally on the  image which is seen in the retina. For some time, the coherence on the  vision will become imbalanced. So, the images appear as unclear and  blurred. After some time, this problem will be solved. On the whole, it  is not good to rub the eyes often which damage the vision of the eyes.



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