I asked Google's AI. It said:
No, there are no documented cases of Botox causing blindness. Botox is a neurotoxin that paralyzes facial muscles, and is not made of collagen or silicone. Blindness after facial injections is extremely rare, and even less common after Botox injections.
However, there are some risks associated with Botox injections near the eyes, including:
Vision problems: Botox injections can temporarily cause blurred or double vision. Most vision issues resolve on their own.
Vascular blindness: This can occur in the glabella area, which is between the eyebrows and above the nose.
Droopy eyelids: This can happen if Botox is injected by an untrained person.
I haven't had any tweakments of any kind, though I understand why people do. Most of my friends have been Botoxing and having little bits of filler since their late forties: they do look better than me! My brother recently had an eyelid lift - very subtle and effective. I've got jowls now, which I find quite disfiguring, and would probably get a lift done if I could afford to.
Agree with the concerns for women starting these treatments in their twenties. They obviously don't need to look younger, and they're the trial cohort as nobody knows the effects of injecting stuff into your face for 40 years continuously.
I think that, once you're past your mid-fifties, you may as well have a go if you're minded and have the money - your infrastructure's already deteriorating naturally, and you might place a high value on appearing to age more slowly for a couple of decades.