| 1 | Photochromic Performance | Speed and consistency of darkening in ultraviolet light, plus fading performance after UV exposure is removed. | Performance should be tested against ISO 8980-5 or an equivalent recognized national standard. Require documented activation and fade test conditions. | Independent laboratory report showing test method, temperature, exposure duration, lens material, and measured luminous-transmittance values. | Critical |
| 2 | UV Protection | Protection against ultraviolet radiation throughout the lens's clear and activated states. | For products marketed as UV400, verify transmission is limited through 400 nm under the applicable regional testing requirements. Do not rely only on marketing statements. | Spectral-transmission test report covering the complete wavelength range and identifying the exact lens design and coating configuration. | Critical |
| 3 | Optical Quality | Prescription accuracy, refractive consistency, surface defects, prism, distortion, and finished-lens quality. | Products should meet the applicable requirements of ISO 8980-1, ISO 8980-2, ISO 14889, or the relevant destination-market standard. | Optical inspection records, tolerance tables, sample inspection results, and documented calibration of measurement equipment. | Critical |
| 4 | Impact Resistance and Safety | Resistance to breakage during normal use, processing, fitting, and handling. | Verify compliance with the mandatory impact-resistance rules of the destination market, such as 21 CFR 801.410 in the United States where applicable. | Batch or product-family impact-test reports from a qualified laboratory, including test conditions and sample identification. | Critical |
| 5 | Material and Coating Durability | Resistance to abrasion, cleaning chemicals, moisture, temperature changes, and coating delamination. | Require documented durability testing using defined cycles and acceptance criteria; compare coating performance across the intended operating environment. | Abrasion, adhesion, humidity, chemical-resistance, and thermal-cycle reports, together with care instructions and warranty terms. | High |
| 6 | Manufacturing Quality System | Process control, traceability, corrective actions, inspection planning, and control of nonconforming products. | An independently certified ISO 9001 quality-management system is a strong baseline for consistent global production. | Current certificate issued by an accredited certification body, audit scope, manufacturing-site details, and recent corrective-action records. | High |
| 7 | Customization and Prescription Range | Availability of single-vision, progressive, high-index, polycarbonate, free-form, and specialty prescription options. | Evaluate the published prescription range, minimum fitting parameters, blank sizes, corridor options, and supported digital-processing formats. | Current product catalogue, technical specification sheets, sample order capability, and written confirmation of prescription tolerances. | Medium |
| 8 | Regulatory and Market Compliance | Ability to supply compliant products and technical documentation for each target market. | Documentation should match the destination market, including applicable EU, United States, United Kingdom, or other national requirements. | Declaration of conformity where applicable, technical file summary, labeling information, test reports, and product traceability records. | Critical |
| 9 | Production Capacity and Delivery Reliability | Ability to support repeat orders, seasonal demand, urgent prescriptions, and international shipping requirements. | Assess quoted lead time, documented on-time delivery performance, minimum order quantity, capacity commitments, and business-continuity planning. | Production-capacity statement, anonymized delivery KPI records, service-level agreement, inventory policy, and disaster-recovery plan. | High |
| 10 | Total Cost and After-Sales Support | Total delivered cost, warranty coverage, remake policy, technical support, communication quality, and complaint resolution. | Compare landed cost rather than unit price alone, including tooling, coatings, freight, duties, remakes, warranty claims, and payment terms. | Formal quotation, warranty document, returns and remake procedure, response-time commitment, and anonymized customer-service performance data. | Medium |