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Sunglasses - definition of lens function

According to the transmittance of visible light, the sunglasses can be divided into 1-4 categories from shallow to deep. Class I: light colored Sunglasses (without polarizing function), with 43% ~ 80% of projection, the lightest color, and the least shading and reducing excessive luminous flux. They are generally used for fashion matching glasses, such as model shows, fashion shows, etc. Class II: light colored sunshade mirror (without polarizing function), with transmission ratio of 18% ~ 43%, slightly light color, used in cloudy days or cloudy days. Three categories: sunshade (polarized sunglasses), projection accounted for 8% ~ 18%, most Sunglasses belong to this level, more suitable for seaside, mountaineering and other outdoor activities. Four categories: special purpose sunglasses, transmission ratio of 3% ~ 8%, in skiing, desert, welding and other special environment is more used. Note: according to the requirements, the transmittance of driving glasses should be greater than 8%, so the fourth type sunglasses are not suitable for driving. Polarizing function: the so-called polarizing sunglasses selectively filter the light from a certain direction. By filtering out many polarized light reflected, the intensity of light in the sky is reduced.

2020

Don't choose this kind of sunglasses

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.

2020

Guess! What color glasses can protect your eyes?

Ultraviolet rays are invisible killers, The eyes were exposed to intense sunlight, The lens in the eye is exposed to too much ultraviolet

2020

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Add:No.68 Xianfeng Road, Xianyan Industrial Zone, Xianyan Street, Ouhai District, Wenzhou City
Tel:+86-577- 66088999
Fax:+86-577-65329007
E-mail:lan@uvoptical.cn

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