The Lens Blank,ophthalmic,bifocal,se, cataloged under National Stock Number 6540-00-142-8709, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-00-142-8709 |
| Item Name | Lens Blank,ophthalmic,bifocal,se |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Status | ACTIVE |
| Base Curve Diopter | 8.25 PLUS NOMINAL |
| Additional Power Rating in Diopters | 1.500 BIFOCAL |
| Style Designator | ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT |
| Diameter | 65.0 MILLIMETERS MINIMUM MM |
| Cross-Sectional Shape Style | SPHERE |
| Reading Segment Diameter | 25.0 MILLIMETERS NOMINAL MM |
| Departure From Cited Designator | AS MODIFIED BY THICKNESS |
| Nondefinitive Spec/std Data | 1 TYPE AND A CLASS |
| Light Transmission | TINTED |
| Material | GLASS SODA-LIME SINGLE VISION |
| Material | BARIUM FLINT GLASS BIFOCAL |
| Tinted Area Light Transmittance in Percent | 31.0 |
| Reading Segment Height | 17.5 MILLIMETERS NOMINAL MM |
| Thickness | 4.0 MILLIMETERS NOMINAL MM |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Unit of Issue | PR |
| Reference | Meaning |
|---|---|
| MILL36460 | 4/1 Identification reference U.S. Government activity |
NSN 6540-00-142-8709 is a Lens Blank,ophthalmic,bifocal,se, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
Key specifications for 6540-00-142-8709: Base Curve Diopter: 8.25 PLUS NOMINAL; Additional Power Rating in Diopters: 1.500 BIFOCAL; Style Designator: ROUND WITH STRAIGHT TOP BIFOCAL SEGMENT; Diameter: 65.0 MILLIMETERS MINIMUM MM. 14 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.