1. It doesn't work
2. There is no good scientific studies it works.
3. It is pushed by people that make money from it.
4. If it worked they would be used by ophthamologist all over the world.
5. If it worked the people that "developed" it would win a Nobel prize.
Save your money for necessities or Christmas presents.
JCH MD
May I know why it is not good, have you tried before?