Sneak Sight

Sneak sight is an effect granted by wearing either a riot gear helmet or its superior versions, the advanced riot gear helmet or the Elite riot gear helmet. It is not necessary to be wearing the matching pieces of armor in order to receive the effect from the helmets.

Overview
To activate sneak sight, simply crouch. When activating sneak mode, a soft mechanical whirring similar to a camera lens can be heard as sneak sight takes effect.

While outside, the player's vision will appear to be as if in black and white, however when indoors, the player's vision has more of a reddish tint, and appears to be more like sepia. There is a brief delay of about a second after entering an indoor area as the player's vision adjusts from black and white to sepia, although there is no perceptible delay when switching from sepia to black and white upon exiting from indoors to outside.

This effect will cancel out once you exit sneak mode, although the other effects remain as long as the helmet is worn and do not require Sneak Sight to be active.

Appearances
The Sneak Sight effect appears only in the Fallout: New Vegas add-on Lonesome Road.