JUNGLE VISION V: EVALUATION OF THREE TYPES OF LENSES AS AIDS TO PERSONNEL DETECTION IN A SEMIDECIDUOUS TROPICAL FOREST
Abstract
The purpose of this study was to evaluate nonmagnifying yellow, red, and dichroid lenses as aids to personnel detection in a tropical semideciduous forest. Twenty-four US infantry soldiers with normal visual acuity were selected as observers. Four subgroups of six EM each were then assigned to observe either with yellow lenses, red lenses, dichroic lenses or unaided vision. Each observer was presented 40 randomly appearing human targets in fatigue uniforms who stood motionless within a 180 degree horizontal field of search. None of the lenses facilitated target detectability as measured by 50% visual thresholds, visibility gradients, or total detections when compared to unaided vision. Furthermore, no significant differences among modes of observation were found for target search time, perceived target distance, or practice gradients. Considerable difficulty was experienced with the condensation of moisture on the insides of lenses fitted both in spectacle and goggle type frames.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1965
- Accession Number
- AD0481177
Entities
People
- C. M. Kindick
- D. A. Dobbins