P, which provide protection against multiple fixed laser wavelengths.

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MIL-PRF-29580C

4.2.1 First article samples. Twelve complete pairs of spectacles, two spare frames, and two

sets of lens overlay templates shall be provided. The samples shall be representative of the

construction, workmanship, components, and materials to be used during production. Approval

of the first article samples or the waiving of first article inspection (see 6.2) does not preclude the

requirements for performing conformance inspection. First article samples shall be furnished to

the Government as directed by the contracting officer (see 6.2).

4.3 Conformance inspection. Conformance inspection shall consist of the tests specified in

table III performed on individual products or lots to determine conformance with the

requirements of this specification. Nonconformance with any specification requirement shall be

cause for rejection of the lot represented by the sample.

4.3.1 Lot formation. An inspection lot size shall be expressed in sample units of spectacles

made essentially under the same conditions and from the same materials as the production units.

The sample unit shall be one pair of spectacles with carrying case.

4.3.2 Sampling. The sample size and acceptance criteria for the examinations and tests for

the spectacles with carrying case shall be as specified in table III.

4.4 Conformance verification inspection. Conformance verification inspection shall consist

of performing the tests, specified in table IV in the order listed, on selected products from the lot

at a Government approved test facility.

4.4.1 Sampling. Upon successful completion of the conformance inspection (see 4.3), a

random sample shall be selected from each lot of spectacles in accordance with Inspection Level

S-3 of ASQC-Z1.4. The sample size shall be based only on the applicable sample size code letter

corresponding to Inspection Level S-3. Each pair of spectacles selected as a sample unit shall be

identified as assigned (see 3.6). The number of sample units selected from the lot shall be

furnished to the Government test facility. Nonconformance with any specification requirement

shall be cause for rejection of the lot represented by the sample.

4.5 Methods of inspection.

4.5.1 Optical inspection.

4.5.1.1 Matching. Matching of spectacle lenses within their frames, for location of the

design eyepoint, prism, and power shall be determined with a telescope, vertometer, lensometer,

projection lantern, or any other instrument that can perform this test. The instrument shall include

a target which can be brought into sharp focus, as observed through an eyepiece or projected on a

screen, and an aperture not greater than 1 cm in diameter, fixed at a definite position along the

axis of the optical system. The design of the system shall be such that refractive power in the