If you want to prevent cataract and presbyopia, the most effective exercise is this::
1. Close your eyes;
2. Turn your pupils (to 'see') clockwise 36 times first, and then anti-clockwise another 36 times;
3. Use you two (fore)finger tips to press the qingming acupoint 36 times (see the picture below);
Keep doing this exercise once a day from age 40 to 50, twice a day from age 50 to 65, and more if needed. By so doing, your eyes(vision) will remain as 'young' as you would like to.
|the qingming acupoint|