Wholesale lens category

Wholesale Semi-Finished Lenses

Large-diameter optical lens blanks for prescription laboratories, selected by material, front curve, geometry, coating route, and the finished Rx range to be surfaced.

Programs listed1

Supply routeCustom inquiry

Buyer responseWithin 1 business day

Category guide

A semi-finished blank is the start of an Rx calculation.

A semi-finished lens has a prepared front surface while the prescription surface still needs to be generated, polished, coated where applicable, verified, and edged by an optical laboratory. It should not be purchased as though it were a finished stock lens.

The correct blank depends on material, index, front base curve, diameter, sag, center thickness, finished diameter, frame data, target power range, and the laboratory design calculation. Buyers should provide the intended Rx coverage and processing route before confirming the curve assortment.

Available programs

Compare semi-finished lenses.

Open a product page for detailed parameters, sample checks, customization options, and procurement FAQs.

Clear 1.59 polycarbonate 75 mm semi-finished optical lens blank shown upright to reveal front curvature and thick edge

SF-PC159-75

1.59 PC 75mm Semi-Finished Blanks

A clear 75 mm semi-finished single-vision blank in 1.59 polycarbonate, prepared for optical laboratories to surface the prescription side and complete the specified coating and finishing program.

1.59 polycarbonate material75 mm semi-finished blankSpherical single-vision design

View specifications

Buying factors

Define the variables before sampling.

A focused specification makes supplier comparison, sample approval, and repeat purchasing more reliable.

Rx calculationSelect front curves against the target power range, finished diameter, frame data, and laboratory design method.

Blank geometryControl nominal diameter, base curve, sag, center thickness, edge condition, and usable surface.

Material processingMatch resin or polycarbonate material to generation, polishing, coating, impact, and regulatory requirements.

Coating routeConfirm whether blanks are uncoated, hard coated, or prepared for a specified HMC or SHMC process.

Procurement reference

What to include in your inquiry.

Final availability, tolerances, testing, packing, and commercial terms are confirmed against the approved product specification.

Supply formatSemi-finished blank with prepared front curve and laboratory-surfaced prescription side

Typical materialsCR-39, optical resin, polycarbonate, and higher-index programs by inquiry

Geometry controlsDiameter, base curve, sag, center thickness, edge, surface cosmetics, and internal stress where required

Laboratory inputsTarget power range, design, minimum finished diameter, frame data, and processing route

Coating routesUC, HC, HMC, or SHMC according to material and laboratory workflow

TraceabilityCurve, material, coating, batch, quantity, carton, and private-label references

Buyer applications

Programs built for professional optical supply.

Rx laboratory surfacingSingle vision prescription productionSpecial power programsLarge finished-diameter framesPolycarbonate laboratory rangesPrivate-label semi-finished assortments

Category FAQ

Questions buyers ask before requesting samples.

What is the difference between finished and semi-finished lenses?

A finished stock lens already carries its optical prescription surfaces. A semi-finished blank still requires laboratory surfacing and verification of the prescription side.

Why are several base curves needed?

Different powers, designs, frame geometries, and finished diameters require suitable front curves to achieve the intended optics and thickness after surfacing.

Is a 75 mm blank always usable at 75 mm?

Not necessarily. Usable finished diameter depends on sag, curve, prescription, decentration, laboratory blocking, and the required edge geometry.

Can semi-finished blanks be supplied coated?

Yes, depending on material and program. The front-surface coating, back-surface processing, final coating route, and compatibility with the laboratory workflow must be confirmed.

What data should a laboratory send for quotation?

Provide material and index, front-curve assortment, target Rx range, diameter, design, coating route, quantities, packaging, and any required geometry or test tolerances.

Request a focused quotation

Send the specification, quantity, and destination market.

We will review the product route, representative samples, packaging requirements, and information needed for a repeatable order.

Discuss semi-finished lensessales@colaoptic.com · Typical first reply within 1 business day