The Lens,ophthalmic,compound, cataloged under National Stock Number 6540-00-001-1000, is classified within Federal Supply Class 6540 (Ophthalmic Instruments, Equipment, and Supplies) of the Medical, Dental, and Veterinary Equipment group. The manufacturer of record is Dispensers Optical Service Corp. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 6540-00-001-1000 |
| Primary Part Number | M4.50 ON M2.25, CR-39 |
| Item Name | Lens,ophthalmic,compound |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Dispensers Optical Service Corp |
| Status | ACTIVE |
| Style Designator | ROUND |
| Diameter | 71.0 MILLIMETERS NOMINAL MM |
| Cross-Sectional Shape Style | SPHEROCYLINDER COMPOUND |
| Sphere Curve Inside Diopter | 4.50 MINUS NOMINAL |
| Light Transmission | UNTINTED |
| Material | PLASTIC SINGLE VISION |
| Cylinder Curve Inside Diopter | 2.25 MINUS NOMINAL |
| Thickness | 1.8 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 |
| Part Number | Manufacturer |
|---|---|
| M4.50 ON M2.25, CR-39 PRIMARY | Dispensers Optical Service Corp (USA) |
| Reference | Meaning |
|---|---|
| P0-063 | 5/1 Secondary reference U.S. Government activity |
NSN 6540-00-001-1000 is a Lens,ophthalmic,compound, manufactured by Dispensers Optical Service Corp, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-00-001-1000 has 1 manufacturer part number on file: M4.50 ON M2.25, CR-39 (Dispensers Optical Service Corp).
1 possible match (shared part number, not a government interchangeability claim): 5935-00-493-5425. Verify interchangeability with system specifications before substitution.
Key specifications for M4.50 ON M2.25, CR-39: Style Designator: ROUND; Diameter: 71.0 MILLIMETERS NOMINAL MM; Cross-Sectional Shape Style: SPHEROCYLINDER COMPOUND; Sphere Curve Inside Diopter: 4.50 MINUS NOMINAL. 8 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.