MIL-DTL-43511D
CRITICAL AREAS ARE LOCATED WITHIN THE DOTTED SEGMENTS, NONCRITICAL
AREAS ARE LOCATED OUTSIDE DOTTED SEGMENTS. NUMBERED CIRCLES
WITHIN THE CRITICAL AREAS ARE DESIGNATED AS POINTS OF CHOICE FOR
PRISMATIC AND DISTORTION TESTS. POINTS BEARING THE SAME NUMBER,
FOR EXAMPLE 5R AND 5L, SHOULD BE COMPARED WITH EACH OTHER, EXCEPT
THAT POINTS NO. 2R AND 2L SHOULD BE COMPARED WITH POINT NO. 3 WHEN
MEASURING REFRACTIVE POWER OR PRISMATIC DEVIATIONS. THIS FIGURE
COVERS ONE SPECIFIC VISOR AND IS INTENDED TO SERVE ONLY AS A GUIDE
SINCE VISOR CONFIGURATIONS DIFFER AMONG DIFFERENT HELMETS.
CRITICAL AREA SUBTENDS APPROXIMATELY A 50 DEGREE FIELD OF VIEW
RADIUS MEASURED ALONG THE PRIMARY LINE OF SIGHT OF THE DESIGNED
RIGHT AND LEFT EYE LOCATIONS.
FIGURE 1. Typical visor configuration.
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