Health Check: New test keeps umpires' eyes on the ball
International tennis umpires literally have to keep their eye on the ball - as well as on activity around the court.
Until now a very detailed eye test was the benchmark to ensure that umpires could keep working on the international circuit.
But now an eye specialist in London has come up with a shorter test which is more tailored towards the needs of their demanding job.
Mr Ananth Viswanathan from Moorfields Eye Hospital has developed a new test, tailored to the fast-moving game of international tennis.
The test examines both near and far sight, and central and peripheral vision as umpires have to watch the players' feet, the ball, the line judges - whilst flicking back and forth to their notes.