A-A-51707A
Type II, Class B single vision lenses shall be a member of an integrated series of minus-toric ophthalmic lenses having surface curvatures computed to conform to the corrected-curved lenses series. Minimum center thickness shall be 1.8 mm and minimum edge thickness shall be 1.0 mm measured 1-1/2 mm from the edge of the lens; the edge thickness measurement is taken parallel to the lens axis.
Type I, Class A lens blanks shall be finished on outside of the lens with the segment size of 28 mm wide x 19 mm high with its straight edge positioned 6.0 mm ± 0.5 horizontal midline and 6.0 mm ± 1.0 inward from the vertical midline of the carrier lens for the 28 mm flat top lens blank. As for the 35 mm flat top lens blank, the segment size shall be 35 mm wide x 22 mm high with its straight edge positioned 6.0 mm ± 0.5 horizontal midline and 6 mm (+ 0.5 or -1.0) inward from the vertical midline of the carrier lens.
Unless otherwise approved by the contracting officer, finished lens shall be with the front base curve specified on the individual lens description, tolerance for the front base curve is 1.0 diopter.
Workmanship. The lens shall be free from defects which may detract from its appearance or impair its serviceability.
Unit. Pair (PR). Two lenses (1 pair), as specified, constitutes one unit. Each lens shall be individually packaged in a snug fitting envelope.
Quality Assurance Provisions.
Responsibility for inspection. Unless otherwise specified in the contract or purchase order, the contractor is responsible for the performance of all inspection requirements as specified herein. Except as otherwise specified in the contact or purchase order, the contractor may use his own or any facilities suitable for the performance of the inspection requirements specified herein, unless disapproved by the Government.
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