Sightless
The creature doesn’t use any visual senses and is thus never subject to any effect that requires the creature to see a target or effect. Sightless creatures normally have some form of blindsight to compensate for their sightlessness, but if not, they’re assumed to be able to operate as well as a creature with normal vision unless the creature’s description says otherwise.
Format: Senses sightless.
Source
Alien Archive pg. 155