By Emily Tait
Eyesight has a big part to play in refereeing decisions during football games, Birmingham City manager Alex McLeish recently said.
The Scot recently saw a goal denied to his side against Portsmouth in a recent FA Cup tie, even though the ball crossed the line.
Birmingham ended up losing the game 2-0 and crashed out of the competition at the quarter-final stage.
"There must be stringent rules for this level for referees to be top match-fit and obviously the eyesight is a huge factor," the manager said, perhaps indicating some officials will need contact lenses to help them see correctly.
He called for the introduction of goal-line technology so that decisions are correct, noting that such systems are used in other sports at the top level.
Fifa recently announced that it would not be implementing goal-line technology.
General secretary of the organisation Jerome Valcke said "door is closed" on the issue.
by Martin Burns