Omaha is considered, by some, to be the hardest game of Poker to master. Of all of the different games of Poker, Omaha is for many the hardest to learn to play and the hardest to bluff in. It is played most often at fixed limits, like Texas Hold'em and pot limit.
Sunglasses are allowed in poker tournaments primarily for the players' comfort, as the bright lights in casinos or tournament venues can be harsh on the eyes.