Blind is a level 24 Outlaw and Subtlety rogue ability. It blinds the target, causing it to wander at 40% of move speed confused for up to 1 minute. This is a disorient effect. Any damage will cancel the Blind effect. Blind cancels combat (turns off auto attacks) when used.
Patch 5.2.0(2013-03-05): Now has a cooldown of 2 minutes (was 1.5 minutes).
Patch 5.1.0(2012-11-27): The cooldown of Blind has been reduced to 90 seconds, down from 3 minutes.
Hotfix (2012-09-28):Blind should always land as intended. Other players should not be able to dodge, block, or parry Blind.
Patch 4.2.0(2011-06-28): Duration against enemy NPCs is now 1 minute, while the duration against players remains 8 seconds.
Patch 4.0.6(2011-02-08): Now has a PvP duration of 8 seconds.
Hotfix (2009-04-30):Blind (Rogue) is now in the same diminishing returns category as Fear effects, but no longer shares diminishing returns with [Cyclone] (Druid).
Patch 2.3.0(2007-11-13): Blind is now a physical (no longer a poison) attack. [Reagent] requirement removed. Now shares the same diminish category as [Cyclone] and is now diminished in PvE as well as PvP.
Previously blind was a nature attack like poison. [Blinding Powder] is now a Grey-quality item ("vendor trash") which can sometimes be found in lockboxes obtained through Pickpocketing. There is a tooltip on the item that explains why Blind no longer needs a Reagent: "Once favored by rogues as a blinding agent, it was abandoned for more readily available resources... like dirt."