To give everyone a reference, as per the PRPG book, page 264, the description of the Darkvision spell:
"The subject gains the ability to see 60 feet even in total
darkness. Darkvision is black and white only but otherwise like
normal sight."
Page 250, description of Blindness/Deafness:
"You call upon the powers of unlife to render the subject blinded or
deafened, as you choose."
Page 562, description of the Darkvision ability:
"Darkvision is the extraordinary ability to see with no
light source at all, out to a range specified for the creature.
Darkvision is black-and-white only (colors cannot be
discerned). It does not allow characters to see anything
that they could not see otherwise—invisible objects are
still invisible, and illusions are still visible as what they
seem to be. Likewise, darkvision subjects a creature to
gaze attacks normally. The presence of light does not
spoil darkvision."
Page 565, description of the Blind status:
"The creature cannot see. It takes a –2 penalty
to Armor Class, loses its Dexterity bonus to AC (if any), and
takes a –4 penalty on most Strength- and Dexterity-based
skill checks and on opposed Perception skill checks. All
checks and activities that rely on vision (such as reading
and Perception checks based on sight) automatically
fail. All opponents are considered to have total concealment
(50% miss chance) against the blinded character. Blind
creatures must make a DC 10 Acrobatics skill check to
move faster than half speed. Creatures that fail this check
fall prone. Characters who remain blinded for a long time
grow accustomed to these drawbacks and can overcome some of them."
Of note, Darkvision is 1 hour/level, while Blindness/Deafness is permanent.
