There is a very effective and easy way for the prevention of eye diseases. An acupressure exercise that consists of 4 steps.
This series of exercises has been introduced from the early 1970s into all major Chinese nursery schools and schools, with around 350 million children doing daily. This number is bigger than the US and Japanese population together!
First step:
1st step

Second step:
2nd step
Third step:
3rd step
Fourth step:
4th step