How do blind football and partially sighted football work?

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Both are adapted versions of futsal, played 5 v 5 (maximum squad of 10) over two halves of 20 minutes, with the clock stopped when the ball is out of play. Goalkeepers are fully sighted. Blind football Eligibility: B1 sight classification internationally. Domestically, the National Blind Football League also has a B1b class for players with a low B2 classification. All outfield players wear eye patches and an eye mask, so everyone plays on a level field. Players track a ball that rattles, and kickboards produce echoes that help them locate it. Players must shout "voy" before challenging an opponent. The goalkeeper stays in a small restricted area; if they distribute the ball to a team-mate in the opposition half, it must bounce before the halfway line. A team can commit up to 5 fouls per half; every foul after that gives an 8-metre penalty. Pitch 40m x 20m. Spectators must stay silent so players can hear the ball and instructions. Partially sighted football Eligibility: B2 or B3 internationally; domestically B4 and B5 players can also take part. The ball must contrast in colour with the pitch and lines, there are no other markings on the playing area, and lighting must be even across the whole area for the whole match. The goalkeeper stays in the penalty area, and the same bounce rule applies when they distribute into the opposition half.