Principal Proposed Natural Treatments
The ability to see in poor light depends on the presence of a substance in the eye called rhodopsin, or visual purple. It is destroyed by bright light but rapidly regenerates in the dark. However, for some people, the adaptation to darkness or the recovery from glare takes an unusually long time. There is no medical treatment for this condition.
Principal Proposed Natural Treatments for Impaird Night Vision
However, neither anecdote nor basic scientific evidence of this type can prove a treatment effective. Only double-blind, placebo-controlled studies can do that. (To learn why this is so, see Why Does This Database Rely on Double-blind Studies? ) The current evidence from studies of this type is more negative than positive, with all of the most recent studies finding no benefit.
Thus, at present, bilberry cannot be recommended as a treatment for improving night vision. For more information, including dosage and safety issues, see the full bilberry article.
Other Proposed Natural Treatments for Impaired Night Vision
There is no question that deficiencies of vitamin A and zinc zinc can also negatively affect night vision. However, there is no reason to believe that taking extra amounts of these nutrients will enhance vision.
- Reviewer: EBSCO CAM Review Board
- Review Date: 07/2012 -
- Update Date: 07/25/2012 -