” Zaidi says repeating the experiments with human retinas could put the question to bed.
(Sliney points out that Palczewski’s team didn’t use the same type of laser his group did to elicit second harmonic generation.) As for Tibbetts’s enhancing his infrared vision, the experiment—which has not escaped criticism, and the results are yet to be peer reviewed—ended after a month, and the group is now writing up the results and moving on.
Tibbetts and his colleague Gabriel Licina say it’s not worth the side effects to pursue any kind of long-term project on giving humans night vision using vitamin deficiency and supplementation.
“It didn’t get interesting until two weeks in.” Tibbets and his collaborators recorded retinal activity in response to various wavelengths of light and found that after taking the dehydroretinol for a few days (and forcing the body to use it as a substitute for retinal), people’s eyes started to react to wavelengths of light longer than 850 nm (the typical limit of the visual spectrum is 720 nm).
Tibbetts says his overall night vision got better, and he could see through the one-way privacy glass on storefronts.