MIL-DTL-43511D
TABLE II. End item tests (continued)
Characteristic
Requirement
Test method
Number of
Results
paragraph
determinations
to nearest
Neutrality of
3.5.8
4.4.8
1/unit
1 percent
class 2 and 3
Chromaticity of
3.5.9
4.4.9
1/unit
1 percent
class 2 and 3
Ballistic
3.5.10
4.4.10
2/
Pass or fail
resistance
Abrasion
3.5.11
4.4.11
2/unit
<2 percent
resistance
Bayer abrasion
3.5.12
4.4.12
2/unit
ratio >4
resistance
Coating adhesion
3.5.13
4.4.13
2/unit
Pass or fail
Weathering
3.5.14
4.4.14
1/unit
Pass or fail
Resistance
Chemical
3.5.14
4.4.15
2/unit
<2 percent
resistance
1/ The test for ultraviolet transmittance shall be performed only on the first lot of visors from
each batch of molding material.
2/ A minimum of three articles.
4.4 End item performance test methods.
4.4.1 Prismatic deviation test. Prismatic deviation shall be measured in accordance with ANSI
Z87.1. Telescope, lensometer or optical beam deviation along the selected line of sight may be
used. Error shall be less than 0.03 prism diopters.
4.4.1.1 Vertical prismatic deviation. BASE UP prism shall be designated positive (+) while
BASE DOWN prism shall be designated negative (-). The vertical prismatic imbalance shall be
defined as the absolute value of the difference between the prism through point "C" of the right
and left eyes. Vertical prismatic imbalance shall meet the requirements as specified in 3.5.1.1.
This calculation can also be applied to other opposing points as stated in 3.4.
4.4.1.2 Horizontal prismatic deviation. BASE OUT prism shall be designated positive (+) while
BASE IN prism shall be designated negative (-). The horizontal prismatic imbalance shall be
defined as the absolute value of the sum of prism at the design eye point of the right and left
lenses. Horizontal prismatic imbalance shall meet the requirements specified in 3.5.1.2. This
calculation can also be applied to other opposing points as stated in 3.4.
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