Prescription lenses and contacts are acceptable to wear when viewing sunlight for circadian rhythm setting.

“your glass window or your windshield or the side window of your car, it isn't optically perfect to bring the image and the light onto your retina. In fact, what it's doing is it's scattering and filtering light in particular the wavelengths of light that you want.”

“whereas sunglasses that are highly reflective or trying to get your sunlight exposure through a windshield of a car or through a window simply won't work.”

“corrective lenses are actually focusing the light onto your retina the windows and and windshields are scattering the light and filtering and how much are sunglasses filtering this out way too much”

“The lenses that you wear in front of your eyes by prescription or on your eyes are designed to focus the light onto your neural retina.”