1. Check Lens Quality: Legitimate sunglasses should be labeled with the product name, color, diameter, quality grade, manufacturer's name and address, trademark, and warning text. When purchasing sunglasses, consumers can request a polarization test lens from the optician.
For polarized sunglasses, the image will change when the lens is directly facing the test lens. Without a test lens, consumers can slowly rotate the sunglasses 60 degrees in front of a computer screen and observe whether the image changes during rotation. If it's polarized, the image will change from bright to dark.
2. Check Lens Color: Sunglasses lenses come in various colors, commonly gray, brown, and tint. Consumers can choose the appropriate color based on their skin tone, hair color, and clothing style.
Generally, gray suits all skin tones and hair colors, providing good visual effects; brown makes skin appear fairer and is suitable for Asians; tint makes the eyes appear brighter and is suitable for matching fashionable clothing.
3. Light Transmittance: Light transmittance is one of the important indicators of lens quality. Generally, high-quality sunglasses need a light transmittance of over 80% to ensure clear vision in sunlight. Consumers can judge the quality by observing the light transmittance of the lenses.
4. Check Performance: When buying sunglasses, consumers should consider the impact resistance and heat resistance of the lenses. Generally, materials such as polycarbonate and acrylic have better impact resistance, while glass and certain special resins have better heat resistance.
5. Check Frame Material: Generally, metal frames are more upscale, non-metallic frames are lighter, and plastic and synthetic materials are more economical. Also, pay attention to whether the size and shape of the frame suits your face shape and nose bridge, as well as whether the weight and comfort of the frame are appropriate.
