Why Optical Professionals Choose Heritage Bifocal Lenses
Heritage Optical Lab manufactures made-to-order Freeform blended bifocal lenses for optical retailers, laboratories, distributors and eyewear brands.
Distance & Near Support
The selected bifocal design provides prescribed distance correction and a defined near addition for suitable wearers and tasks.
Design-Specific Fitting Review
Monocular PD, fitting height, frame information and applicable design references are checked before production.
Complete Order Data Review
Submit R/L prescription, ADD, prism/base when prescribed, material, treatment, color and finishing requirements.
Practical B2B Supply
Start from free samples, then discuss repeat ordering, packaging and special engraving marks.
Who We Support
Bifocal Lens Options for Different Customer Needs
Select the appropriate bifocal lens design, material, treatment and finishing from the prescription, fitting data, frame, intended use and destination-market requirements.
Prescription, frame size, optical-center position, material and expected thickness are reviewed together before production.
A clear material option for suitable prescriptions, available with compatible hard coating and anti-reflective treatments.
A compatible hard coating improves surface durability; hydrophobic and anti-reflective options can be reviewed with the full order.
Higher-index materials may help manage lens profile when selected according to prescription, diameter and frame dimensions.
Clearer indoors and dark gray outdoors when activated; final color and activation depend on material, light and temperature.
A dark gray prescription sun-lens option with polarized glare control, subject to RX and production compatibility.
OptoCalc Invisible Bifocal Design Scope
This page focuses on OptoCalc Invisible Bifocal, an advanced Freeform bifocal with a digitally generated round near segment blended into the lower lens surface. The design is intended to improve aesthetics, smooth the power transition and reduce the characteristic image jump of traditional visible-segment bifocals. Conventional bifocal styles require separate segment and fitting confirmation.
Invisible Bifocal Calculation, Fitting and Inspection
Each Invisible Bifocal order is calculated from the complete RX and confirmed design. The verified design references are a 4 mm fitting cross position, 12 mm recommended fitting height, 10 mm minimum fitting height and 0-6 mm inset. Supply monocular PD, fitting height, frame measurements or trace, material, treatment and finishing requirements. External reference marks used during inspection are not a physical ridge or permanent optical boundary.
Bifocal Lens Wholesale Information
Start with a reviewed Freeform bifocal sample program, then develop repeat supply around the confirmed prescription range, fitting data, material, treatment and destination requirements.
Flexible MOQ
Start from free samples, then discuss repeat ordering, packaging and special engraving marks.
RXoffice Online Ordering
Submit the confirmed prescription, ADD, fitting, material, treatment and finishing requirements through the supported workflow.
Within 48 Hours
Standard confirmed bifocal RX orders are produced within 48 hours. Complex work requires separate technical confirmation.
Global Delivery
DHL or FedEx delivery can be reviewed according to the destination, order volume and packing requirements.
OEM & Private Label
Supported packaging, lens envelopes, labels and special engraving marks are confirmed before repeat production.
Repeat-Order Support
Confirmed specifications and order records help simplify review and maintain consistency for subsequent orders.
Bifocal Lens Specifications and Ordering Guide
OptoCalc Invisible Bifocal production requires the complete prescription, ADD, monocular PD, fitting height, frame data and the verified 4 mm fitting cross, 12 mm recommended height, 10 mm minimum height and 0-6 mm inset references.
- RX & Fitting Data
- Invisible Bifocal Design
- Ordering Workflow
| Order input | Information to provide | Why it matters |
|---|---|---|
| Prescription | R/L SPH, CYL, AXIS and ADD; prism/base when prescribed | Defines distance power and the prescribed near addition |
| Invisible Bifocal reference | 4 mm fitting cross, 12 mm recommended fitting height, 10 mm minimum fitting height and 0-6 mm inset | Applies the verified OptoCalc Invisible Bifocal design values |
| Positioning | Monocular PD and fitting height | Positions the digitally blended near area for each eye |
| Frame | A, B, DBL, effective diameter and preferably a frame trace | Supports blank, thickness, layout and edging review |
| Position of wear | Vertex distance, pantoscopic tilt and wrap angle when required | Supports individualized compensation where applicable |
| Lens system | Material/index, coating, color and finishing service | Confirms a compatible production specification |
Digitally blended round near segment
OptoCalc Invisible Bifocal integrates a digitally generated round near segment into the lower lens area. The surface is blended to make the dividing line nearly invisible and to reduce the abrupt image jump associated with traditional visible-segment bifocals.
| Design characteristic | Invisible Bifocal reference |
|---|---|
| Available corridor length | Not applicable |
| Fitting cross position | 4 mm |
| Recommended fitting height | 12 mm |
| Minimum fitting height | 10 mm |
| Inset | 0-6 mm |
These values apply to the Invisible Bifocal design and should not be reused for conventional visible-segment bifocals or other Freeform designs.
Confirm the complete R/L prescription, ADD and any prescribed prism/base information.
Check monocular PD, fitting height, frame dimensions or trace and intended distance and near tasks.
Confirm the Freeform bifocal program, applicable fitting reference, material, treatment, color and finishing.
Manufacture the approved specification through digital calculation, surfacing, polishing and treatment processes.
Check prescription power, external reference points, appearance and the confirmed finishing requirements before delivery.
A bifocal lens combines two principal prescribed viewing distances: distance correction and a lower near addition for reading and close work.
No. It is a temporary external marking used for identification and inspection. It is not a physical ridge, groove or hard zone boundary in the lens.
A bifocal provides distance and near correction. A progressive changes power continuously through distance, intermediate and near areas without a visible segment line.
Provide the complete R/L prescription including ADD, monocular PD, fitting height, frame measurements or trace and any design-specific position-of-wear data.
Suitable orders may use CR-39 or higher-index materials with compatible hard coating, anti-reflective, hydrophobic, Photo Grey or polarized gray options.
No. For OptoCalc Invisible Bifocal, the catalogue references are a 4 mm fitting cross position, 12 mm recommended fitting height, 10 mm minimum fitting height and 0-6 mm inset. These values are design-specific and should not be applied to every bifocal program.
Send the target prescription range, ADD, fitting requirements, material and treatment options, frame conditions and destination market. The RX team reviews the requested program before confirming suitable samples.
Yes. Once the design, fitting inputs, material, treatment, packaging and any special engraving marks are confirmed, the supported order records can simplify review for subsequent production.
How Heritage Verifies Freeform Bifocal Lens Orders
Each order is reviewed as one complete lens system so the prescription, ADD, fitting information, design, frame, material and treatment requirements remain aligned through production.
Confirm the R/L prescription, ADD, monocular PD, fitting height, frame information and prescribed prism data.
Review the selected Freeform bifocal program, fitting reference, material and frame conditions before production release.
Use the applicable fitting cross and temporary reference marks to support layout and power verification.
Verify the completed lens against the confirmed order, treatment, appearance and finishing requirements.