Figure 2.

 The UFOV test, described in the schematic diagram here, consists of three parts, each measuring a component of the useful field of view. Target objects are presented on a customised computer monitor, with information displayed progressing from simple to complex. Presentation time varies depending on the participant’s performance pattern. In stage 1 (central vision processing speed) the participant identifies a target object presented in the centre of the computer screen for varying lengths of time. In stage 2 (divided attention) the participant identifies a target object as before but also locates a simultaneously presented target object displayed in the periphery of the screen. Stage 3 (selective attention) is similar to the previous stage, except that the target object displayed in the periphery is embedded in distracters, making the task more difficult. The test is driven by a PC and administered using a touch screen monitor.