I have friends who have had serious permanent vision changes as a result of taking a reasonable dose of psychedelics one time (which is one of the main reasons I haven't tried it). If you overdose on either lsd or alcohol you'll have serious ill effects.
Vision changes are part of any intoxication, most avid alcohol users have them all the time. You have vision changes due to high blood pressure, so vision is perhaps not a KPI to put on the table as a major one.
This is absolute nonsense and is not backed by any sane scientific evidence. Using alcohol even once, in the quantities readily made available everywhere where alcohol is available, can finish you off in the most diverse and bizarre ways.
What’s even more ridiculous is the fact even quarter pill of the Xanax kind mixed a very limited amount of alcohol gets you potentially higher than most psychedelics when properly dosed. And both opioids are super well available…
You have never done LSD so I won’t even bother with my experiences on it other than you don’t lose your sense of reality, risk or self-preservation.