What is that "eye" logo that appears on top of the screen in a Samsung galaxy 5S?

There is a logo that looks like an "eye" appearing beside the clock logo on the top part of my samsung galaxy 5S. It temporarily blocks any key I touch for a few seconds. As it keeps appearing, I cannot touch the screen and I have to wait for it to disappear before I can continue. Am I being watched?...or can anyone tell me what that logo is for. thanks in advance

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