Sight screen

Typically, two sight screens are actively deployed on a field during live play, each positioned a short distance behind the boundary rope.

[4] Sight screens have, on occasion, not been large enough to entirely cover the critical area for the batsman to effectively view the bowler's delivery.

Similarly, sight screens have in the past been used for display advertising, compromising their darkness (in limited overs matches) or whiteness (in Tests).

On such occasions, batting sides have often expressed frustration, especially if particular batsmen experienced difficulty in effectively seeing the ball during a fast bowler's delivery.

Jacques Kallis lost a wicket to an Andrew Flintoff full toss at Edgbaston Cricket Ground under these circumstances during South Africa's tour of England in 2008, an incident that triggered much debate at the time.