Visual Quality Inspection: Inspect the lenses for scratches, bubbles, or impurities, and check the frames for deformation, paint loss, or damage through visual examination and tactile inspection.
Optical Performance Testing: Use a lensmeter to measure the lens's diopter, astigmatism power, and optical center displacement, ensuring compliance with vision correction or plano lens standards.
UV Transmittance Testing: Use a spectrophotometer to measure the lens's UV (UVA, UVB) transmission, absorption, and reflection capabilities to evaluate UV protection performance.
Visible Light Transmittance Testing: Measure the proportion of visible light passing through the lens using a spectrophotometer to determine its tint level and clarity.
Impact Resistance Testing: Conduct a drop-ball test by dropping a steel ball of specified weight onto the lens from a set height to assess its resistance to breakage.
Abrasion Resistance Testing: Use an abrasion tester to simulate daily wear and tear, observing the extent of surface abrasion to evaluate the durability of the coating and material.
Frame Strength Testing: Apply tension or pressure to frame hinges, end pieces, and the bridge to test resistance against deformation and breakage.
Corrosion Resistance Testing: Immerse the frames in simulated sweat or saline solution and observe metal components for signs of rust or corrosion.
Dimensional Inspection: Measure dimensions such as frame width, temple length, and bridge width to ensure compliance with ergonomic design standards.
Flame Retardancy Testing: Conduct a flame test to observe the burning rate and self-extinguishing properties of the frame material when exposed to fire.
Labeling and Marking Inspection: Verify that information on the packaging and lenses-such as brand, material, and UV protection rating-is accurate and compliant with regulations.
