Wolfberries have been used clinically to help maintain vision and eye health for centuries now. New research from Kansas State University may shed some light on the biological effects of the small fruit, http://www.sciencedaily.com/releases/2010/03/100330102835.htm.
One simple tonic that can be of great benefit, especially in the warmer months, is a combination of wolfberries and chrysanthemum flowers.
Add 7-10 dried chrysanthemum flowers to a tall glass along with enough wolfberries to cover the bottom of the glass. Add hot water and let steep for 5 minutes until all of the flowers have opened and sunk to the bottom of the glass. Enjoy warm. You can add hot water 3-4 additional times using the same flowers. Try adding them to your travel mug in the morning and keep adding hot water throughout the day. You can add some green tea leaves as well if you need a little more flavor.
For diabetics who are suffering visual lossin addition to this tonic there are acupuncture protocols and self-massage techniques which can also help increase blood flow to the eyes which may reverse damage and restore vision.