MIL-PRF-38169A
percentage within nine spectral bands is the total of the products of the percent deviation and the
weights in table I divided by the total weight, i.e., average deviation = 261/71, or 3.7%. Table I is
based on the International Commission on Illumination (CIE) illuminant D65 which represents the
colorimetric specification for daylight.
6.3.4 Chromaticity coordinate calculation. An example for calculation of chromaticity
coordinates is shown in table II.
6.3.5 Refractive power. The applicable portion of National Bureau of Standards (NBS) Special
Publication 374 is suggested as a method of checking refractive power.
6.3.6 Flash blindness goggle (FBG). The class 3 lens (98% filter) is a constituent part of the
FBG.
6.4
Protective cover. In previous procurements, each visor and goggle lens was protected
from damage during handling and shipping by a suitable cover. Also, each visor and goggle lens
was accompanied by a printed circular. The circular cautioned the handler to use care in cleaning
and installing the visor and goggle lens to prevent damage to the ophthalmic surfaces and
recommended a suitable cleaning agent.
6.5
Subject term (key word) listing.
Chromaticity
Distortion
Eye protection
Flash blindness goggle (FBG)
Luminance
Optical
Prismatic deviation
Radiation
Refraction
Transmittance
Vision
6.5
Changes from previous issue. Marginal notations are not used in this revision to identify
changes with respect to the previous issue due to the extent of the changes.
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