Spec Check
single vision lenses vs progressive lenses
The single vision lenses line you send us
Reference design, index or power path, and quantity for the Spec Check brief.
Single vision lenses scope we keep identical
Factories quoting that same single vision or progressive scope—not a silent substitute.
Open single vision lenses items until the factory writes them
Marking, coating and lead time until confirmed on the named model.
Open items to close before accepting a substitute
Frame size
Lens width, bridge and temple in millimetres when edged pairs must fit the same front.
Lens design
Single vision, bifocal, progressive or plano—keep each path on its own quantity line.
Marking
Ask whether Z87 or another mark is on this model before treating a blank as protective eyewear.
Use this Spec Check page to resolve open choices on single vision lenses vs progressive lenses before you accept an alternative factory offer. We are an independent sourcing desk, not the lens laboratory. Before accepting an alternative, verify whether the substitute changes corridor geometry, index path or coating scope. A cheaper reply that swaps a single vision blank for a progressive path is not the same line.
| Check | Buyer confirms | Why it matters |
|---|---|---|
| Design path | Single vision or progressive | Corridor scope changes cost even when outer diameter matches |
| Index / material | Named index or resin path | A thinner claim without numbers is not comparable |
| Coatings | Hard coat or anti-reflective coating included or excluded | Silent omissions break landed-cost comparisons |
| Safety marking | Only if the named model sheet states ANSI Z87.1 or another mark | Plano and prescription-adaptable lines stay separate |
These checks are procurement verification steps, not factory test certificates owned by this desk. Sample approval remains the buyer's decision before bulk quantity releases. Ask for the documents that cover the quoted item rather than a generic factory brochure. Review inquiry options when the form is known, or send the requirement when open items remain. Optional budget and high-end, mid-range, budget or undecided preference are buyer notes only.
Write single vision lenses specification, quantity and destination
FREE sourcing support and up to 3% apply only to qualified business buyers after the product, quantity, destination and request are checked on this Spec Check path.
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