The idea of “precision” tints has arisen from the May 2011 article in Cephalalgia in which custom optical tints were used to reduce visual sensitivity in migraine patients. You can view the study here http://www.ncbi.nlm.nih.gov/pubmed/21622479 and a review article here http://www.gizmag.com/tinted-glasses-fight-migraines/18751/. In this study, subjects looked into a colorimetry machine and adjusted the mix of different colors they viewed until they found something that they perceived as pleasing. The researchers then used this information to design spectacle tints to give subjects similar effects to what they’d chosen from the colorimeter.
To get a “precision tint” would mean visiting an eye care professional who has a colorimetry machine and who can then blend a customized tint for you. This process may cost several hundred dollars and very few eye care professionals have the necessary equipment at this time.
Because the FL-41 tint specifically has been shown to be effective for migraine, and because we can produce this tint relatively inexpensively and with quality control measures, we’ve chosen to use FL-41. FL-41 blocks light in the blue-green part of the spectrum, which is the color that activates the retinal pathway that modulates migraine (http://www.ncbi.nlm.nih.gov/pubmed/20062053) and likely other light-sensitive conditions. We are currently using more advanced engineering techniques to produce lens coatings that will perform better than FL-41 for migraine sufferers. These will be available to the public in the future.
Photo by G.L. Kohuth.