Re: Wonder what effect ethanol has on the proteins?
https://io9.gizmodo.com/why-viagra-tints-your-vision-blue-1685176169
It appears to cause the mainly blue/green sensitive rod cells to increase in sensitivity, causing colour shifts and blue wash effects.
Interestingly I had a similar reaction with generic anti histamines. Stopped taking them after I essentially blacked out for 5 hours and didn't remember doing some very intricate micro-soldering and other tasks like washing up. Thought it was the day before!
Its worth mentioning that a lot of the problems seem to be that some people get a severe reaction due to some combination of genetics and physiology, have a missing copy of a bilirubin related enzyme but that shouldn't do anything significant so I have no idea what caused it.