Study of illumination selection for distance vision evaluation of the pilots wearing night vision goggles
10.3760/cma.j.cn113854-20201025-00158
- VernacularTitle:飞行员佩戴微光夜视镜后远视力检测时的光照条件研究
- Author:
Fei YU
1
;
Qin YAO
1
;
Shan CHEN
1
;
Hongbo JIA
1
;
Minghao YANG
1
;
Quan WU
1
;
Guowei SHI
1
;
Yange ZHANG
1
;
Dawei TIAN
1
Author Information
1. 空军特色医学中心，北京 100142
- Publication Type:Journal Article
- Keywords:
Distance vision;
Night Vision Goggles;
Light conditions;
Pilots
- From:
Chinese Journal of Aerospace Medicine
2021;32(2):76-80
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the illumination for distance vision evaluation of the pilots wearing night vision goggles (NVGs).Methods:The distance vision was tested by circular visual acuity chart for flying personnel 5 m apart from subjects. The Illuminance on the surface of chart was set 300 lx for naked eye and 1×10 -1 lx and 1×10 -3 lx for NVG aided eyes. The naked and NVG distance visions of 15 healthy male volunteers were tested under all illuminations. The differences of NVG distance vision were compared between the illuminations of 1×10 -1 lx and 1×10 -3 lx to determine the proper level for evaluation. The naked and NVG distance visions of 20 male pilots were tested to verify the feasibility and necessity of the test, but NVG tests were only at 1×10 -1 lx level. Results:Volunteers′ left distance vision was 0.67±0.39, the right was 0.67±0.38 and the binocular was 0.80±0.40. Their NVG distance vision under 1×10 -1 lx was 0.53±0.22, 0.59±0.25 and 0.63±0.24 respectively, comparing with the vision of 0.30±0.11, 0.34±0.11 and 0.36±0.11 under 1×10 -3 lx. The difference showed statistical significance ( P<0.05). In verification test, the left, right and binocular NVG distance vision of 20 pilots under 1×10 -1 lx was 0.63±0.16, 0.64±0.14 and 0.73±0.12 respectively, comparing with their left, right and binocular naked vision of 1.12±0.32, 1.08±0.37, and 1.37±0.37 respectively. Conclusions:The tests indicated that 1×10 -1 lx would be the appropriate illumination level for pilot′s NVG distance vision evaluation. And it is necessary to evaluate pilot′s NVG distance vision before night flight mission.
