Part Details | SEMIFINISHED BIFOCAL OPHTHALMIC LENS BLANK
6540-00-926-4716 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.
Alternate Parts: MILL16991, 6540-00-926-4716, 00-926-4716, 6540009264716, 009264716
| Supply Group (FSG) | NSN Assigned | NIIN | Item Name Code (INC) |
|---|---|---|---|
| 65 | APR 27, 1966 | 00-926-4716 | 30300 ( LENS BLANK, OPHTHALMIC, BIFOCAL, SEMIFINISHED ) |
REFERENCE DRAWINGS & PICTURES
SPHERE
ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT
Cross Reference | NSN 6540-00-926-4716
| Part Number | Cage Code | Manufacturer |
|---|---|---|
| MILL16991 | 81349 | MILITARY SPECIFICATIONSPROMULGATED BY MILITARY |
Technical Data | NSN 6540-00-926-4716
| Characteristic | Specifications |
|---|---|
| STYLE DESIGNATOR | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT |
| DIAMETER | 54.0 MILLIMETERS MINIMUM AND 58.0 MILLIMETERS MAXIMUM |
| READING SEGMENT DIAMETER | 25.0 MILLIMETERS NOMINAL |
| READING SEGMENT HEIGHT | 17.5 MILLIMETERS NOMINAL |
| MATERIAL AND LOCATION | GLASS, SODA-LIME SINGLE VISION AND GLASS, BARIUM BIFOCAL |
| LIGHT TRANSMISSION | UNTINTED |
| CROSS-SECTIONAL SHAPE STYLE | SPHERE |
| BASE CURVE DIOPTER | 4.25 PLUS NOMINAL |
| ADDITIONAL POWER RATING IN DIOPTERS | 2.250 BIFOCAL |
| NONDEFINITIVE SPEC/STD DATA | 1 TYPE AND A CLASS |
| PART NAME ASSIGNED BY CONTROLLING AGENCY | LENS BLANK OPHTH BIFOCAL SEMIFINISHED GLASS+4.25 ADDL2.25DIOPTER |