All hormones and neurotransmitters in the body are directly controlled through full spectrum sunlight into the eyes peripheral during the day Sunglasses in 99% of scenarios are a net negative because they go directly against the first principles of evolutionary circadian biology There is no argument to be made for the use of sunglasses outside of active glare The optometrists and ophthalmologists who try to push this narrative around UV ocular damage are out of their depth. They don’t know anything about circadian mechanisms, nor how light relates to a systems view of biology