Faces in the Dark

Faces in the Dark is a 1960 British thriller film directed by David Eady and starring John Gregson, Mai Zetterling and John Ireland. The film is based on the 1952 novel "Les Visages de l'ombre" by Boileau-Narcejac.
It was shot at Shepperton Studios with sets designed by the art director Anthony Masters.
Plot.
Richard Hammond, an aggressive and ambitious business mogul inventor, with little or no time for his wife, friends or family, is blinded in an explosive accident, on the same day his long-suffering wife had planned to leave him. He becomes convinced that he is going mad, but it soon becomes apparent this is a deliberate attempt by someone else. 
A devious woman, the inventor's wife, is plotting with her lover in an attempt to make her husband think he's going insane, in the hopes he will take his own life and leave them free to pursue their illicit affair in peace.
Critical reception.
The "Radio Times" wrote "this tale of blindness and rage should have been a real nail-biter. Sadly, ex-documentary director David Eady simply doesn't have the thriller instinct and throws away countless opportunities to make the tension unbearable." However, "TV Guide" wrote that "The film has some pot-holes, but the chilling climax is smooth as glass"; and Allmovie noted "Although there may be a few minor gaps here and there in the storyline, "Faces in the Dark" is a suspenseful drama."