Palming is a good way to relax eye muscles. When you get tired, you should stop to have a rest. Sit in a proper place and close your eyes and try to relax. Rub the palms of the both hands to get mild comforting warmth. Then cover your eyes with the warm palms. In this way, the heat from the hand presents energy to the eyes and have your eye muscles relaxed.
Eye muscle exercises are generally beneficial to the eyes and eyesight by relaxing eye muscles. A person can train the eyes targeting the ocular muscles. Some sports can help you relax eye muscles such as badminton and pingpong. You need to shift your focus from near to far and in this way the eye muscles can get enough relax.