"Negligible side effects" stood out to me because I remember reading in a few places [0] [1] that depriving oneself of Vitamin A can improve vision; but at a he

"Negligible side effects" stood out to me because I remember reading in a few places [0] [1] that depriving oneself of Vitamin A can improve vision; but at a health risk. I've also heard that this is impossible. [2]. I wonder if these things are co-related somehow? [0] -- https://www.physiology.org/doi/abs/10.1152/ajplegacy.1938.123.3.732?journalCode=ajplegacy https://www.physiology.org/doi/abs/10.1152/ajplegacy.1938.12... [1] -- https://petapixel.com/2014/08/23/dietary-experiment-successfully-extends-human-vision-near-infrared/ https://petapixel.com/2014/08/23/dietary-experiment-successf... [2] -- https://petapixel.com/2014/08/25/retinal-neuroscientists-rebuttal-humans-cant-see-infrared-matter-eat/ https://petapixel.com/2014/08/25/retinal-neuroscientists-reb...