Yes. Tobii eye tracking systems use near-infrared illumination to create reflections on the eyes that can be tracked with high accuracy.
Near-infrared light can be found in our natural environment, for instance in candle lights, fires, and in the sun where the IR light is invisible or viewed as white light.
Since 2009 there is a new European standard called EN 62471 for products using LED lights. All Tobii Eye Trackers have been tested and approved by certified labs according to the European standard for optical radiation hazards of different lamps and lamp systems, IEC/EN 62471. Light emission that meets this standard is not harmful to the human eye.
Read more about IEC/EN 62471 here.