The Lens,ophthalmic,compound, cataloged under National Stock Number 6540-00-001-0660, 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 12 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active. Unit of issue: PR.
| Parameter | Value |
|---|---|
| NSN | 6540-00-001-0660 |
| Primary Part Number | M7.50 ON M3.50 |
| Item Name | Lens,ophthalmic,compound |
| FSC / FSG | 6540 / 65 — Ophthalmic Instruments, Equipment, and Supplies |
| Manufacturer | Dispensers Optical Service Corp |
| Status | ACTIVE |
| Base Curve Diopter | 12.00 PLUS NOMINAL |
| Supplementary Features | UNCUT |
| Style Designator | ROUND |
| Diameter | 65.0 MILLIMETERS MINIMUM MM |
| Cross-Sectional Shape Style | SPHEROCYLINDER COMPOUND |
| Departure From Cited Document | AS MODIFIED BY DIAMETER |
| Nondefinitive Spec/std Data | 3 STYLE AND B CLASS |
| Sphere Curve Inside Diopter | 7.50 PLUS MAXIMUM |
| Light Transmission | UNTINTED |
| Material | PLASTIC SINGLE VISION |
| Cylinder Curve Inside Diopter | 3.50 MINUS MAXIMUM |
| Thickness | 1.6 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 |
| Part Number | Manufacturer |
|---|---|
| M7.50 ON M3.50 PRIMARY | Dispensers Optical Service Corp (USA) |
| Reference | Meaning |
|---|---|
| MILL36824 | 4/1 Identification reference U.S. Government activity |
| P7.50M3.50,12BC,66MM,CR-39 | 3/1 Design control — primary reference Atlanta/olympic Optical Co |
NSN 6540-00-001-0660 is a Lens,ophthalmic,compound, manufactured by Dispensers Optical Service Corp, classified under FSC 6540, Ophthalmic Instruments, Equipment, and Supplies. Status: active.
NSN 6540-00-001-0660 has 1 manufacturer part number on file: M7.50 ON M3.50 (Dispensers Optical Service Corp).
5 possible matches (shared part number, not a government interchangeability claim): 6540-00-001-0727, 6540-00-001-0728, 6540-00-001-0729. Verify interchangeability with system specifications before substitution.
Key specifications for M7.50 ON M3.50: Base Curve Diopter: 12.00 PLUS NOMINAL; Supplementary Features: UNCUT; Style Designator: ROUND; Diameter: 65.0 MILLIMETERS MINIMUM MM. 12 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.