Day of the Triffids (1962)

The sky lit up in bright fire of colors changing like a psychedelic hallucination. Nobody could resist the mesmerizing visualization, intranced to the ever changing patterns above. For many, it was the most amazing night of their lives. It would also be the last night they'd ever see.

For the next day was without light. Everyone had lost their sight and were screaming for someone to help them. There was no traffic or people waiting in line. An ant like chaos reigned throughout the human colony.

They could still hear, but the ambient world surrounding them was not recognizable. Filled with clattering sounds of uneven rhythms, insect-like snaps and jagged edges smoldering rough material.

The Triffids had arrived.

And nobody were the wiser.

IMDB