Key points for Third-party inspection of glasses
In 2023, the global glasses market will exceed 140 billion US dollars, but quality risks are frequent - more than 30% of e-commerce returns are due to degree errors, and 23% of EU recalls involve excessive nickel! Third-party glasses inspection uses rigorous testing (such as FDA impact resistance and UV400 certification) to build a safety and compliance defense line for enterprises, helping brands seize the high-end market, reduce the risk of millions of recalls, and win consumer repurchases with data-based trust. Quality is competitiveness, and inspection has become an "invisible ticket" for the global glasses track!
1. Structural inspection
1.1 Frame structure
Integrity: Check that all parts of the frame (frame, temple, nose pad, hinge) are not broken, deformed or burred.
Hinge function: Open and close the temple ≥ 500 times (ISO 12870 standard), and there is no looseness, jamming or falling off after testing.
Elasticity test: The metal frame needs to test the resilience of the temple after bending outward 15° (the deformation after recovery is ≤5mm).
Nose pad stability: The adjustable nose pad should be firm and not loose, and the silicone nose pad should not have aging cracks.
1.2 Lens assembly
Lens fixity: The gap between the lens and the frame is ≤0.5mm, and there is no risk of loosening or falling off.
Edge processing: There is no edge collapse, burrs or sharp points on the edge of the lens (EN 166 standard).
Stress test: Use a polarizing stress meter to detect that there is no excessive stress concentration after the lens is assembled.
2. Material inspection
2.1 Frame material
Metal material: Nickel release ≤0.5μg/cm²/week (EN 16128:2011).
Plastic/TR90 material: No irritating odor, high temperature resistance test (70℃/4h without deformation).
Surface treatment: No peeling or fading of the coating (salt spray test ≥24h in accordance with ISO 9227).
2.2 Lens material
Material certification: Resin lenses must comply with FDA 21 CFR or EN ISO 12312-1 impact resistance.
UV protection: UV blocking rate ≥99% (UV400 standard), provide test report.
Blue light protection (if applicable): Indicate the blue light filtering band (such as 415-455nm) and transmittance.
3. Optical performance inspection
3.1 Refractive power and astigmatism
Degree error: Spherical lens (SPH) ≤±0.08D, cylindrical lens (CYL) ≤±0.04D (ISO 8980-1).
Optical center deviation: Deviation from nominal pupil distance ≤2mm.
Prism: Prism of non-prescription lenses ≤0.25Δ (GB 10810.3).
3.2 Light transmission performance
Transmittance uniformity: Difference in light transmittance in different areas of the lens ≤3%.
Anti-fog/anti-reflective coating: Reflectivity ≤2% (multi-layer coating), anti-fog effect passed water vapor test.
4. Safety and protection standards
4.1 Mechanical safety
Lens impact resistance: Steel ball drop test (16g steel ball falls freely from a height of 1.27m, and the lens does not break).
Children's glasses: Must pass the EN 71-3 toy safety standard (risk of choking on small parts).
4.2 Chemical safety
Phthalates: Children's glasses plasticizer content ≤0.1% (REACH regulations).
Heavy metal migration: Lead (Pb) ≤0.02%, Cadmium (Cd) ≤0.01% (CPSC/CPSIA).
5. Dimension and specification compliance
Frame size: The deviation between the rim width, temple length, and bridge width and the marked value is ≤±1mm.
Lens thickness: Center thickness ≥1.0mm (resin lens), edge thickness meets the design tolerance.
6. Packaging and labeling
Label information: Must include CE/FCC/GB logo, degree, material, UV protection level, manufacturer information.
Warning label: Such as "non-bulletproof lens" and "do not look directly at strong light sources" (ANSI Z80.3).
Instructions: Contains instructions for use, cleaning methods and applicable scenarios (such as driving, outdoor).
7. International standard references
ISO 12312-1: General requirements for sunglasses and fashion glasses.
ISO 12870: Test methods for eyeglass frames.
EN 166: Personal eye protection equipment.
FDA 21 CFR 801.410: American standard for lens impact resistance.
GB 10810 series: Chinese national standard for eyeglass lenses.
8. Inspection tool list
Focometer, UV tester, caliper, torque tester, polarizing stress meter, salt spray test chamber, impact tester.
9. Inspection process recommendations
Sampling standard: Samples are drawn according to AQL II level.
Functional testing: Optical performance and structural stability testing are prioritized.
Record retention: Take photos to record defects and retain inspection data for at least 3 years.
The above inspection points can ensure that eyewear products comply with target market regulations (such as EU CE, US FDA, China GB) and international quality standards, reducing the risk of returns and recalls.
