The phrase "a hidden eye" is correct and usable in written English.
It can be used in contexts where you want to describe something that is being observed secretly or discreetly.
Example: "In the shadows, a hidden eye watched their every move, ensuring that no detail went unnoticed."
Alternatives: "a concealed observer" or "an unseen watcher".
In the final seconds of the season finale, an eerie shot of a long, empty hallway in a hotel, where Alicia (Julianna Margulies) has just embarked on her own affair, suggests the presence of a hidden eye and the presumption that the matter will not remain hushed.
This, then, is quite different from a "hidden eye picture" or even from the subliminal images Mark Tansey cleverly conceals in the background of his work, which can be hard to see but, once seen, cannot be seen in any other way; e.g., see his "West Face," 2004).
"In the way of preserving your sight," he said, "it's making sure you don't have any hidden eye diseases".
The embodiment of such offensive traits, she is also shown to be ingenious, pretending that she has a hidden third eye which always keeps things under watch.
Hidden eyes in the corridor open slowly to reveal a razor-sharp gaze.
But if the one-way mirror were turned around, and Britain became as East Germany was to the hidden eyes of the Stasi, then we would be living in a tyranny.
The Hare with Amber Eyes: A Hidden Inheritance.
By David Cameron's minister for universities and science, who is one of the Tories' few acknowledged Deep Thinkers.Biography and memoirThe Hare with Amber Eyes: A Hidden Inheritance.
At the center of the composition, a yellow necklace draws the eye to a hidden female form.
These natural configurations, which appear beautiful to human eyes, share a hidden proportion.
Autism is a hidden disability, invisible to the naked eye, so other people don't see what we go through. .
