Our quality control starts with the inspection of incoming raw materials. We rigorously select raw material suppliers to ensure they meet our technical design requirements and high standards.
In manufacturing our product range, we adhere to the highest industry standards globally, making us a trusted Longbeach partner.
Our stringent quality testing and control processes have reduced our product defect rate to just 0.01%.
This is the most critical specification for eyewear, directly determining whether clear and comfortable vision can be provided. It involves testing parameters such as lens vertex power (i.e., prescription strength) deviation, cylindrical axis deviation, and the horizontal distance and vertical disparity between optical centers. If any parameter exceeds national standards, it can lead to eye strain, dizziness, or even the worsening of vision problems.
Inspect the lenses for surface defects such as scratches, bubbles, pits, or impurities, and verify that their optical transmission properties (e.g., luminous transmittance, UV transmittance) meet the requirements for their specific category (such as sunglasses or driving glasses).
Ensure the eyewear is sufficiently durable and safe for daily use, covering:
- Frame durability: e.g., fatigue resistance tests (simulating repeated opening and closing of temples), bridge deformation tests, and lens retention tests.
- Sweat corrosion resistance tests: simulating the corrosive effects of sweat on the frame to evaluate the corrosion resistance of coatings and materials.
- Flame retardancy tests: evaluating the fire resistance of frame materials.
Particular emphasis is placed on ensuring the safety of specific types of eyewear. For instance, impact resistance tests—such as the drop-ball test—are conducted on sunglasses, safety goggles, and driving glasses to ensure that the lenses do not easily shatter and cause injury upon impact from external forces.
This is the most direct quality check, performed via visual inspection and the use of measuring tools. It includes:
- Frame appearance: Checking for issues such as scratches, burrs, discoloration, or weak welds.
- Assembly quality: Checking that lenses are securely installed, screws are tightened, left and right lenses are symmetrical, and the frame is free from deformation.
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