AN EVALUATION OF CONTENDER HELMETS FOR VISUAL OBSTRUCTION AND PRELIMINARY VALIDATION OF A VISUAL OBSTRUCTION MEASURING TOOL

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Authors
  1. Shek, Y.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The aim of this study was to (1) use a headform-perimeter to evaluate contender army helmets for visual interference; and (2) determine the effectiveness and validity of using the headform-perimeter to measure visual interference compared to using human subjects. A headform was made in-house to be used with a standard Goldmann perimeter. The headform-perimeter was used to evaluate the six contender helmets for visual obstructions, by measuring loss of field of view (FOV). In a separate study, human subjects FOV measurements were obtained with the same Goldmann perimeter. Subjects' loss of FOV while wearing various helmets were measured. The results showed that: (1) all brimmed helmets caused significant reductions of FOV when compared with baseline measurements (no helmet); (2) brimless helmets (British and Israeli) did not cause any significant reduction of FOV; and (3) the headform FOV data were consistent with subjects' FOV measurements, for three of the six test helemets.
Keywords
Field of view (FOV);Goldmann perimeter;Headforms;Visual obstruction;Incompatibility;Foreign equipment
Report Number
DCIEM-97-R-64 —
Date of publication
01 Dec 1997
Number of Pages
27
DSTKIM No
98-00459
CANDIS No
507334
Format(s):
Hardcopy;Document Image stored on Optical Disk

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