[ Coloryte ] – As well as having a technical article on wavelengths, these make and sell glasses and lense coating to help you compensate. Worth a look if you are colourblind. Or perhaps for opticians looking for niche items. I’ll leave it in for now, but as there’s still information around about them, but I think the company no longer trades.
Microsoft’s advice on Colourblindness – that got erased in the past decade too, as did many other links I had.