Should I be concerned that my eye prescription has changed so much in 3 years?

I have never needed glasses so the figures do not really mean much to me.

Diet can play a big part and so can regularly changing focus to exercise the eyes. Collagen is important to the body and to the eyes and vitamin c is essential for it's formation. Smoking reduces vit c levels which is why smokers skin ages faster. There are a few different forms of collagen in the body used for different purposes. Collagen is formed from amino acids, with glycine being required most, with proline, lysine and others in smaller amounts. Lysine is an essential amino acid but glycine and proline can be made by the body but this can be insufficient. Bone broth soup or maybe gelatin provides these amino acids. These amino acid powders can be purchased but be aware that Glycine influences GABA levels which can promote sleep unless other stimulating amino acids are consumed. High protein foods can promote sleep too for a similar reason.

http://heatherdane.com/how-i-improved-my-eyesight/

Anthocyanidins/Proanthocyanidins can also be helpful as they strengthen collagen and bones and are also antioxidants. They can also help the circulatory system
[EDIT]
Anthocyanidins are present in many foods to some degree as they provide natural colour to fruit and veg. They are more highly concentrated in black/blue/red berries such as cherries, blueberries, blackberries, elderberries or hawthorn berries etc.

http://www.encognitive.com/node/13238

These all work together, the more you take the bigger the improvement.

tidus wrote: »

The previous answer is bull**it, by the way. I'm an Optometrist.

Seconded! (By another Optometrist).