Accession Number : ADA138330

Title :   The Effect of Haze on an Operator's Visual Field and his Target Detection Performance.

Descriptive Note : Technical rept.,


Personal Author(s) : Kama,W N ; Genco,L V ; Barbato,M A H ; Hausmann,M D

Full Text :

Report Date : Nov 1983

Pagination or Media Count : 27

Abstract : A study was conducted to determine what type of relationship, if any, exists between the amount of haze emanating from a transparency and the percent of an operator's visual field that is 'lost'. The effect of this haze on his ability to perform a target detection task was also determined. Ten subjects performed a simple target detection task in which they were required to indicate when they could see a slowly moving, 1.0 minute of arc, 80% contrast target that traveled in 8 (0, 45, 90, 135, 180, 225, 270 or 314 degrees) different angular directions from the center of a background screen towards the periphery. The subjects performed this task while looking through haze test panels mounted at 90 deg, 63 deg or 45 deg to their line of sight and which when illuminated by a bright light source mounted at the center of the background screen resulted in haze conditions of 2%-3.5%, 5%-10%, 15%-26% or 25%-48%. A baseline condition in which no test panel was interposed between the subject, the task, and the bright light source was also administered. Subject performance was evaluated in terms of (1) the distance the target had moved before being seen, and (2) the number of times that is was not detected. The results of this study indicated that as the percent of haze present in a transparency increased, the percent of an operator's background FOV that is occulded also increased but that the percent of targets detected decreased.

Descriptors :   *Vision , *Line of sight , *Haze , *Performance(Human) , *Target detection , Operators(Personnel) , Visual perception , Visual acuity , Visibility , Transparencies , Moving targets , Space perception , Contrast , Transparent panels , Test methods , Illumination

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE