These are a few basic exercises that will strengthen the eye muscles and increase their flexibility. Rotate the eyes in a circle from right to left and bottom to top. Reverse the rotation. If you find that your eye muscles are stiff, perform the rotation only a few times at first. Then gradually increase the number of rotations.
Looking at the tip of the nose, slowly look up along the right side of the nose and then the left side. Glance back and forth between viewing the right side and the left side of the nose. Starting at the tip of the nose, look up at your eyebrows and then back to the tip. Use your imagination to invent other eye exercises.