Multifocal Lenses · CO-BF
CR-39 and 1.56 bifocal programs with round-top, flat-top or blended near segments. Clear, blue-filter and photochromic options can be specified around the required addition and coating.
Sample-first cooperation · Typical first reply within 1 business day
Buyer fit
For optical buyers sourcing conventional segmented distance-and-near lenses. Confirm segment shape, size, addition and fitting references separately; one sphere value does not define the complete bifocal product.
Start with representative samples, approve the agreed specification, then use it as the reference for trial and repeat orders.
Technical parameters
Final material, power matrix, coating, tolerances, tests, and availability are confirmed before quotation.
Updated
| Parameter | Configuration |
|---|---|
| Lens design | Bifocal |
| Index options | CR-39 / 1.56 |
| Segment choices | Round-top / flat-top / blended |
| Sphere reference | −2.00 to +3.00 D |
| Addition reference | +1.00 to +3.00 D |
| Function options | Clear / blue cut / photochromic |
| Coating | UC / HC / HMC / SHMC |
| Segment dimensions | Confirmed from the selected design drawing |
| Segment | Geometry | Order detail |
|---|---|---|
| Round-top | Circular near segment | Diameter and fitting reference |
| Flat-top | Near segment with a flat upper boundary | Segment width and position |
| Blended | Near segment with a blended transition in appearance | Exact design and checking instructions |
Segment width, addition and fitting height are separate specifications. Suitability and fitting require qualified optical assessment.
Lens design
The main area provides the distance correction and the lower segment carries near addition. Round-top, flat-top and blended designs differ in segment geometry and appearance. Approve a drawing and sample rather than ordering from an abbreviation alone.
Application & selection
Include the required addition and segment measurements with the prescription. Have the laboratory check frame cutout and the manufacturer's fitting instructions. A substitute segment design needs review even when the prescription values match.
Sample and quality route
Reviewed against the confirmed product and packing specification.
Reviewed against the confirmed product and packing specification.
Reviewed against the confirmed product and packing specification.
Reviewed against the confirmed product and packing specification.
Reviewed against the confirmed product and packing specification.
Procurement FAQ
No. A blended bifocal retains a distinct near segment; a progressive design changes power gradually through a corridor.
Confirm the combination of material, segment, function and coating before ordering.
ADD is the additional near power. It must be recorded separately from distance sphere and segment dimensions.
Start with a useful inquiry
We will help narrow the specification, sample scope, packaging route, and commercial terms.
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