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• Time of issue:2020-08-07
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(Summary description)In hot summer, people who often go out for activities or work outdoors need sunglasses. Sunglasses can block uncomfortable strong light, while protecting the eyes from UV damage. Economic Daily - China economic network tips, sunglasses purchase to see these elements.
First of all, regular brand products should be selected, and the anti ultraviolet function should be clearly marked. According to the international standards, sunglasses are listed as personal protection products. The main function of sunglasses is to block the glare of sunlight. However, the international standard subdivides sunglasses into "fashion glasses" and "general purpose glasses". The standard of "fashion mirror" is relatively low, and it is basically used for decoration.
The types of sunglasses can be roughly divided into five types: anti reflective protective lens, color lens, colored lens, polarizing lens and color changing lens. Choose according to your needs and avoid poor quality lenses. Sunglasses can block ultraviolet rays because a special coating film is added to the lenses. However, poor quality sunglasses can not block ultraviolet rays, but also seriously reduce the light transmittance of the lenses. As a result, the pupil will be enlarged, and ultraviolet rays will be injected into the lenses in large quantities, causing damage to the eyes. In addition, poor quality lenses also cause nausea, forgetfulness, insomnia and other visual fatigue symptoms.
The shape of the mirror frame can be selected according to the shape of the face. For a round face, the square frame is more spiritual; if it is a long face, the wider sunglasses will make the face look narrower; for the square face with obvious mandibular angle, try to choose the round sunglasses with moderate size.