Sunglasses are a type of visual health product or special accessory that reflects personal style to prevent strong sunlight from causing harm to the eyes. People will choose sunglasses according to different needs.
However, some people often experience discomfort or quality issues with their sunglasses when choosing them. Glasses experts remind citizens to pay attention to the following points when choosing sunglasses:
1. Firstly, check the quality of the lenses to see if the surface of the lenses is smooth, without warping, scratches, or bubbles. Lens warping can cause vision deviation, unevenness, marks, bubbles, and discomfort such as dizziness. It should also be noted that the lenses should not be too thin, otherwise high-temperature deformation can also cause dizziness.
2. You can hold your sunglasses 45 centimeters away from your eyes, observe the vertical and horizontal lines around them through your glasses, such as window frames or door frames, and then move your glasses up, down, back, and forth. If the straight line is crooked or swinging, it indicates that the lens is deformed and should not be purchased.
3. Sunglasses also have an important indicator of light transmittance, which is the ratio of the light flux passing through the lens to the incident light flux. It is also an important performance indicator specified by mandatory standards. If light colored sunglasses are used for shading, the wearer will not be able to achieve the effect of shading. Using sunshades as light colored sunglasses can affect the clarity of the wearer's vision.
4. Place sunglasses in front of your eyes, observe distant targets through the lens, such as window frames or door frames, and then move the glasses up, down, back and forth. The target should not swing or deform in a wavy shape. It is also possible to observe the image of the lamp tube on the surface of the sunglasses lens under a fluorescent lamp, and rotate the sunglasses to make the lamp tube image appear in different parts of the lens without deformation, which is the best option. Some polarized sunglasses on the market use resin polarized lenses with a thickness of 0.7mm. Due to the thin thickness of the lenses, they are prone to deformation during assembly, and special attention should be paid when selecting.
5. The color of the lens should not be biased, and the color of the surrounding environment should not be distorted. Before wearing sunglasses, observe objects in red, green, yellow, and other colors. Then, wear sunglasses and observe the same object. The colors observed twice should not be biased, otherwise it will reduce the ability to recognize traffic signals. For sunglasses with colored lenses, especially those with bright colors, attention should be paid to this identification.
