Accession Number : ADA327089

Title :   Effect of Incompatible Light on Modified Class B Night Vision Goggle-Aided Visual Acuity and Contrast Sensitivity.

Descriptive Note : Final rept. Mar-Aug 96,

Corporate Author : HUGHES TRAINING INC MESA AZ TRAINING OPERATIONS DIV

Personal Author(s) : Gibb, Randall W. ; Reising, Jack D.

PDF Url : ADA327089

Report Date : FEB 1997

Pagination or Media Count : 28

Abstract : MIL-L-85762A, Lighting, Aircraft, Interior, Night Vision Imaging System (NVIS) Compatible, defines criteria for assessing night vision goggle (NVG) compatibility of cockpit lighting. As part of the assessment procedures, NVG aided visual acuity (VA) is measured using the USAF Tri-Bar Chart. A cockpit light is incompatible if NVG aided VA is degraded. An alternative method of measuring NVG aided VA uses an NVG Chart. This research assessed whether the two NVG aided VA assessment techniques reveal the same levels of degradation in NVG aided VA. NVG aided contrast sensitivity (CS) also was measured to determine its usefulness in assessing the compatibility of a cockpit light. Three NVG CS charts were developed having spatial frequencies of 3, 6, and 12 cycles per degree (cpd). NVG performance was degraded by incompatible light, and the amount of degradation was assessed using the two VA and CS measures. Measurements were made using a modified Class B NVG. Another objective of this research was to assess the compatibility of the modified Class B NVG with compatible cockpit light defined in MIL-L-85762A. The results revealed that NVG aided VA did not differ between the two VA charts. For the green light, NVG aided CS was degraded only for the high spatial frequency (12 cpd). However, for the red light, NVG aided CS was degraded for all three spatial frequencies. NVG aided CS was sensitive to the presence of incompatible light. The modified Class B NVG is compatible with the lighting requirements defined in MIL-L-85762A.

Descriptors :   *COCKPITS, *NIGHT VISION DEVICES, *AVIATION GOGGLES, *VISUAL ACUITY, SPATIAL DISTRIBUTION, CONTRAST, PERFORMANCE(HUMAN), RED(COLOR), COMPATIBILITY, ILLUMINATION, HUMAN FACTORS ENGINEERING, NIGHT FLIGHT, GREEN(COLOR), HEAD UP DISPLAYS, INDICATOR LIGHTS, CUES(STIMULI), IDENTIFICATION LIGHTS.

Subject Categories : Flight Control and Instrumentation
      Optical Detection and Detectors
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE