However, you must be very careful around possible IR or UV sources as there will be no reflex to keep your eyes closed, look away or close your pupils! You will

However, you must be very careful around possible IR or UV sources as there will be no reflex to keep your eyes closed, look away or close your pupils! You will at most feel the warmth of the light source in the skin of your face, at which point it is likely too late. If intentionally sticking your head in a strong light source, wear eye protection.