Power Word Blind

Power Word Blind
(Player's Handbook v.3.5, p. 263)

Enchantment (Compulsion) [Mind-Affecting]
Components: V,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature with 200 hp or less
Duration: See text
Saving Throw: None
Spell Resistance: Yes

You utter a single word of power that causes one creature of your choice to become blinded, whether the creature can hear the word or not. The duration of the spell depends on the target's current hit point total. Any creature that currently has 201 or more hit points is unaffected by power word blind.
Hit Points Duration
50 or less Permanent
51-100 1d4+1 minutes
101-200 1d4+1 rounds