The Chron-Optic© glasses were tested for efficiency in a scientific laboratory setting. Preventing the action of short wavelenths of light was demonstrated to asctualy impair the impact of blue light over the biological rhythm.
http://onlinelibrary.wiley.com/doi/10.1111/j.1600-079X.2006.00332.x/abstract
The Chron-Optic© glasses were also tested for the first time on permanent night shift workers as well as rotating shift worker. Those studies in the actual work place showed us that the Chron-Optic© glasses can contribute to improve sleep during the day, as well as reduce sleepiness while working.
http://informahealthcare.com/doi/abs/10.1080/07420520903044398