Fantasy Movie before 1992
Hi all,
I am looking for a fantasy movie that is at least 30 years old I would say. I can only remember some strange details of which I hope that they belong to the same movie.
There was a lake where people drank from and everyone who did so became blind. Could be that this was in the vicinity of a small community and they where either hexed or enslaved or extorted.
There was some kind of video effect that was either tied to the drinking of water or maybe a magician/witch performing a spell. The video effect looked like the whole screen was flashing with color changes. Think of it like a negative (but maybe with variations with different color palettes).
I think that the area around the lake/well/water source looked a bit like a dry steppe or mountain area. Not much green, but gravel and such.
I don't know if the movie was a US production or maybe something European as they also produced a lot of fantasy movies back in the days.
Please help me, this drives me nuts. No internet digging could help me so far.