Frankly my experience with posting sources on HN has almost never been good. It's often just taken as a reason to pick those apart and start a flamewar. My comment above has been downvoted at least 5 times which makes me confident that this is one those times.
For what it's worth I have no stakes in anything and no sources at hand. I remember having read at least two different studies about this, but it has been years. I'm sure your google-fu is as good as mine so maybe you can find something.
2016: Red Light of the Visual Spectrum Attenuates Cell Death in Culture and Retinal Ganglion Cell Death in Situ
" Low, non-toxic levels of red light focussed on the retina for a short period of time are sufficient to attenuate an insult of raised IOP to the rat retina"
2015: Mitochondrial Decline Precedes Phenotype Development in the Complement Factor H Mouse Model of Retinal Degeneration but Can Be Corrected by Near Infrared Light
"we provide evidence for a mitochondrial basis for this disease in mice and correct this with simple light exposure known to improve mitochondrial function"
And this site includes an interesting chart of effective light frequencies:
"This chart pulled from the Joovv site shows that one of the receptors of light energy in our body, Cytochrome C Oxidase, absorbs many more photons at certain wavelengths."
