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National Stock Number:
6540-00-142-8709
Federal Supply Class:
6540
National Item Identification Number:
001428709
Description:
LENS BLANK,OPHTHALMIC,BIFOCAL,SE
Detail:
A TRANSPARENT OPTICAL ELEMENT CONSISTING OF A MAJOR BLANK AND A BIFOCAL SEGMENT. THE BLANK AND SEGMENT HAVE BEEN PRESSED IN A GLASS MOLD TO AN APPROXIMATE SIZE AND SHAPE, AND ARE GROUND AND POLISHED TO A FINISHED DIOPTER CURVATURE ON ONE SURFACE ONLY.
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Manufacturer Information:
| MILL36460 | 81349 | MILITARY SPECIFICATIONS PROMULGATED BY MILITARY DEPARTMENTS/AGENCIES UNDER AUTHORITY OF DEFENSE STANDARDIZATION MANUAL 4120 3-M |
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Techincal Specification:
| ADDITIONAL POWER RATING IN DIOPTERS | 1.500 BIFOCAL | | BASE CURVE DIOPTER | 8.25 PLUS NOMINAL | | CROSS-SECTIONAL SHAPE STYLE | SPHERE | | DEPARTURE FROM CITED DESIGNATOR | AS MODIFIED BY THICKNESS | | DIAMETER | 65.0 MILLIMETERS MINIMUM | | LIGHT TRANSMISSION | TINTED | | MATERIAL AND LOCATION | GLASS, SODA-LIME SINGLE VISION AND GLASS, BARIUM BIFOCAL | | NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND A CLASS | | PART NAME ASSIGNED BY CONTROLLING AGENCY | LENS BLANK OPHTHALMIC SEMIFINISHED BIFOCAL PLUS 8.25 PLUS 1.50 | | READING SEGMENT DIAMETER | 25.0 MILLIMETERS NOMINAL | | READING SEGMENT HEIGHT | 17.5 MILLIMETERS NOMINAL | | STYLE DESIGNATOR | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT | | THICKNESS | 4.0 MILLIMETERS NOMINAL | | TINTED AREA LIGHT TRANSMITTANCE IN PERCENT | 31.0 |
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