In the previous article, we discussed “Will water damage polarized sunglasses?”. In this article, let’s talk about “How do I choose sunglasses?”.
Precautions for Selection
You should choose the sunglasses produced by normal manufacturers in the normal sunglasses shops. They have sunglasses that prevents ultraviolet function. The sunglasses sold by the street stalls and hawkers often can not achieve the standard of anti-ultraviolet, so you had better not choose and buy. When choosing the lens, pay attention to the surface of the lens. If they are smooth, with no defects, no bubbles, no wear marks. The lens should be laid flat and observed for warping from the horizontal direction. The color selection of the lens should be based on the principle that the color of the surrounding environment should not be distorted after wearing the lens. The edge of the object should be clear, and the signal lights of different colors can be effectively recognized.
How to identify?
You should see the product signs or instructions if there is anti-ultraviolet labeling. UV Index: When it comes to sunglasses, the UV index is the performance of filtering out ultraviolet light. Most sunglasses currently have a UV index between 96 and 98 percent, and dark lenses are better than light ones. Check lenses for optical defects. Hold sunglasses in your hand, stretch your arms out, and look through the lenses at right angles or straight lines (such as door frames or Windows) in the distance. Move the frame slowly up and down, left and right. If you find distortion, skew, or bending, the lens is unqualified. Check the quality of the frame. Place the sunglasses flat on the counter. If the glasses don't hold smoothly, there is a problem with the frame. Sunglasses still has an important index called light transmission ratio. It is the ratio of the luminous flux that passes through lens and incident luminous flux, also being the important performance index that a mandatory standard sets.
Judge your face shape.
The relationship between sunglasses and face shape is closely related. Combining the face shape with the style of glasses will get a good-looking effect. When choosing sunglasses, consider how they fit with the size of your eyes, the shape of your face, eyebrows, and nose. In general, people with square faces tend to wear glasses with oval frames or soft frames. By wearing these glasses, the outline of the face can be softened. The round face is suitable for wearing glasses with the opposite frame type and square face because they need to increase the outline of the face through the sunglasses that have obvious frame type. The inverted triangle face people need to wear sunglasses with the frame that The upper half is narrow and the lower half is wide, to modify the lack of face type.
Choose the Right Lens
A dark green lens can absorb hot gas, bring a cool and refreshing feeling, but the translucent luminosity and clarity are lower, suitable for wearing when basking in the sun, unfavorable when driving. Grey lens is a more comprehensive lens, and can still clearly distinguish the color after wearing. Tawny lenses block the reflected light from a smooth, shiny surface, allowing wearers to see the finer parts, which makes them ideal for drivers.
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