saw it in 1970

I saw it in the sixties and it scared me for a long time as well.No i own the movie.

Saw this as a teen in the mid-Sixties on the local "creature features" type program.

The hypnotic eye device that Desmond used to hypnotize his subjects fascinated me and totally creeped me out. No explanation is ever given for its origin or how it works, which made it all that more mysterious.

This kind of gimmick, as it were, was the sort of thing that set some of the horror/scifi movies shown in the wee hours apart from others more prosaic and dreary (I am in the main referring to so-called classic horrors from the '40s).

"Look here!"

I saw this shortly after it came out (i was maybe 7)at a drive-in theatre in Great Falls, Montana. It was playing on a double bill with "I Passed for White". I NEVER forgot either one of these movies, especially The Hypnotic Eye and the hair on fire and sulphuric acid scene. Scared the crap out of me, LOVED it, lol.

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I too saw it as a (little) kid in the mid 60's (at a drive-in, I think). I was too young to remember the name of the film, but boy, the hair on fire scene haunted me!
I spent at least 30 years trying to find the film, based on what I remembered.
It was all my father's fault.
My dad (as far back as I remember) allowed me to watch age inappropriate films that he liked. Every monster film made, every spy flick, even some very adult thrillers.
(Seconds, and The Night Visitor were also films that "scarred" my fragile little mind- and kept me searching for years!)
I will forever be grateful to him for exposing me to some of the weirdest films (which I still love).