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Eye glasses third party inspection:

There are 2 places are famous for making prescription eye glasses, eyewear, spectacles and frames in China, Hengguang Shenzhen & Zhenjiang Jiangsu. And some low end sunglasses & protection goggles in Yiwu, Ningbo Zhejiang. The quality QC inspection onsite will check:

Aesthetic, visual defects, workmanship, surface and function inspections OK
Labels, markings, logos & barcodes inspections NOT OK
Product specs, and special requirements verifying N/A
Quantity & assortment checks OK
On-site safety, regulation & function tests OK
Measurements & sizes checks OK
Packaging, safety and drop tests onsite OK

Professionally, there are below kinds of factory onsite QC for eye glasses:

Eye glasses third party inspection

The checklist for the quality check for eye glasses:

Close and open each temple 10 times, of each model and colour-no serious play in the temple, screws should stay firmly-5 pcs PASSED
Adhesion test (scotch adhesion) 3 times inside right temple on printing of each model and colour-printing should resist and should be still readable-5pcs PASSED
Spectacle cases-no serious scratches, no dammage, no pending fil, no printing mistake-20 pcs PASSED
Packaging-bulk production should comply to specification doc-II FAILED
Compare with reference samples-bulk production should comply -II PASSED
Carefully move nose pad holder of an angle of 90° 3 times of each model and colour-nose pad holder should not break or split-5 pcs PASSED
CE conformity certificate must be provided for each model and colour-form filled in-Check once only PASSED
Bending front surface 3 times of each model and colour-lenses should stay firmly in frame-5 pcs PASSED

3rd preshipment products goods factory onsite inline final Random AQL PSI TPI FRI DUPRO on-site in-line pre-shipment QA QC check quality control assurance services in China India Vietnam Thailand Malaysia Bangladesh Taiwan.