Stock and RX describe two order routes. Stock lenses are produced in repeatable power, diameter, material, design, and coating combinations and held for faster supply. RX lenses are made against a specific prescription or job file and can extend the range or customization beyond the stock matrix. A strong wholesale program often uses both routes with a clear boundary between them.
Key takeaways
- Stock lenses support repeatable volume when the required prescription falls inside the published matrix.
- RX production is job-specific and needs complete prescription, design, frame, fitting, and service data.
- RX does not mean one design; it can include conventional surfaced or freeform products.
- Define how out-of-range, prism, special diameter, and remake requests move from stock to RX.
How the order routes work
Finished stock lenses are manufactured in volume and organized by SKU. The buyer selects from available sphere, cylinder, diameter, material, design, and coating combinations. Their main operational value is predictable availability and a simple replenishment process.
RX lenses are produced after the laboratory receives a job specification. Depending on the product, this can involve selecting a semi-finished blank, calculating the design, generating and polishing a surface, coating, inspection, and optional edging. The route supports wider or more individualized requirements but adds data and lead-time dependencies.
Supply comparison
The most economical route is the one that meets the specification without adding unnecessary processing or inventory.
| Item | Finished stock lens | RX prescription lens |
|---|---|---|
| Order basis | Published SKU and power matrix | Individual prescription or job file |
| Customization | Limited to available combinations | Wider power, design, prism, diameter, and fitting options |
| Lead time | Normally shorter when stocked | Production lead time required |
| Inventory | Buyer or supplier holds SKUs | Made per job; less finished-SKU inventory |
| Primary control | Matrix accuracy and stock continuity | Data accuracy, calculation, processing, and job traceability |
Data required for RX orders
Incomplete RX data creates avoidable delays and remake risk. Required fields vary by design, so agree on a formal order template.
- Right and left sphere, cylinder, axis, and add where applicable
- Prism and base direction where required
- Monocular PD, fitting height, and other design measurements
- Frame shape, box dimensions, or tracer file
- Lens design, corridor, material, index, and coating
- Minimum thickness and diameter requirements
- Tint, photochromic, polarization, or spectral options
- Edged or uncut supply, mounting details, and job identifier
Build a practical hybrid program
Use sales history to identify the powers and coatings that justify stock. Keep slower or more complex prescriptions in the RX route. The quotation should state the boundary between the two, including surcharges and expected lead times.
Test the workflow with representative jobs before launch. Verify order-file interpretation, optical result, markings, coating, packaging, status communication, and remake handling. A repeatable service process is as important as the lens specification.
Buyer questions
Frequently asked questions
Is every RX lens freeform?
No. RX means made for a specific job. The lens may use conventional surfacing, freeform surfacing, or another defined production route.
Are stock lenses lower quality than RX lenses?
Not inherently. Stock and RX describe supply routes. Quality depends on the design, material, manufacturing controls, tolerances, coating, and suitability for the prescription.
When should a buyer move a power from RX to stock?
When repeat demand, service targets, SKU economics, and shelf-life considerations justify holding that exact configuration.
Further reading
These external references provide background context. Product availability and performance claims must still be confirmed for the exact item being purchased.