Infrared allows All For One to sense his entire surroundings using infrared senses.
He uses this Quirk to compensate for his blindness and be able to easily navigate around his surroundings. This Quirk also allows him to sense the emotional state of others to an extent.
However, the range that he is able to sense is limited. This Quirk can also be disrupted by sensors.
- My Hero Academia Manga: Chapter 94 (p. 16).