Your mental focus helps you see farther with darkvision.
Prerequisite: Darkvision.
Benefit: While you are psionically focused, your natural darkvision range increases by 30 feet.
Special: This feat affects only darkvision permanently gained from a creature’s race, type, or class, not from impermanent effects such as the darkvision spell or goggles of night.
Source: Races of Stone, page 137.