Humans - Blind
Most Races - Infravision (aka Serpent Sight)
Dark Elves - Ultravision
Infravision lets you see a heat source at night - does not let you see invisible.
Ultravision lets you see the entire envirionment but in a higher spectrum of light - hence the name "ultra" vision. This is also why ultravision shows everything with a blueish tint.