Sunglasses of different uses and purchase options

armani sunglass

Sunglasses is a strong incentive to prevent sun damage caused by the human eye vision care products, as people's material and cultural level, but also as sunglasses reflect the personal style of beauty or special jewelry.

    Sunglasses can be divided into shade by use of mirrors, light-colored sunglasses, and three types of special-purpose sunglasses.

    The so-called sun mirror, suggests that it is for the use of shade, sunglasses in the sun usually rely on the flux regulator to adjust the size of the pupil, when the light intensity of more than ability to regulate the human eye, it will cause harm to the human eye. So in outdoor activities, especially in the summer, many people are using mirrors to block the sun visor, sunglasses to reduce eye fatigue or adjust the light stimulation caused the damage.

    Light-colored sunglasses, blocking the sunlight as the sun mirror, but its colorful sunglasses, suitable for use with various types of clothing with, has a strong decorative effect. Light-colored sunglasses because of its rich colors, styles, by the young people of all ages, women's fashion is fallen in love with it. Special purpose sunglasses block the sunlight has a strong functions, commonly used on the beach, skiing, hiking and other outdoor more intense sunlight, sunglasses and other indicators of its performance have a higher UV requirements.

    Different groups of people, sunglasses depending on the preferences and choose sunglasses for different purposes, but the most fundamental thing is to protect the wearer from safety and vision does not damage the basic principle. Reduce the light stimulation, visual clarity without distortion, anti-UV, no distortion of color recognition, accurate traffic signal recognition, should be the basic functions of sunglasses. If there are defects in these functions, ranging from sunglasses would not achieve the role of weight will produce dizziness, eye soreness and other symptoms of sunglasses consciously meet, sometimes there will be a slow, color illusion and sunglasses walking debate inequality symptoms depending on the material and lead to accidents and so on. So I chose not to focus only on style sunglasses to the neglect of its intrinsic quality. When consumers buy sunglasses sunglasses is important to note the following points:
1, sunglasses, sunglasses must first know the purpose of purchasing

    From the above description of several types of sunglasses, we know that different types of sunglasses has a different application situations and people. We want to buy sunglasses, first make sure your purchase is intended for the shade, or as with clothing decorative role? In addition to shade other than whether there is anti-ultraviolet function requirements? The safety performance of the lens there any special requirements? Only clear these aims, combined with style and worn on my face the practical effect, to buy a suitable sunglasses.
2, sunglasses must learn to read the product identification

    Not all sunglasses have a UV feature, a standard to meet the basic requirements of sunglasses, can only say that while there is no light in the block more UV light through. If a pair of sunglasses can block light and can not block the same amount of ultraviolet light on the wearer, the will to accept more than not wearing sunglasses, UV (wear sunglasses, will reduce the flux into the human eye, resulting in wearers pupil increase). Counter in a store selling sunglasses, the lenses on the tag or packaging are generally clearly marked, as in the clothing fabric on their ingredients label, consumers must look carefully at the time of purchase.
1) the anti-UV sunglasses feature logo

    Is there an anti-UV sunglasses feature, sunglasses we can not distinguish with the naked eye, the factory is the product of express commitment to consumers with protection only reference sunglasses, sunglasses we can in some product labels and glasses positive see such as: "100% UV", "UV400", "block all UV," "UV" and express identity.

    UV light is between 200nm ~ 380nm wavelength in the sun's rays, sunglasses include three categories: UVA wavelength of 315nm ~ 380nm, UVB wavelength of 280nm ~ 315nm, UVC wavelength of 200nm ~ 280nm. The sun's rays reach the Earth's surface (290nm ~ 2000nm) in about 13% of ultraviolet rays, UVA accounts for which 97%, UVB accounts for 3%, UVC close to 0. UV damage to the human eye is mainly determined by the wavelength of ultraviolet light, radiation time and radiation intensity of sunglasses and eye the strength of self-defense mechanism, the cornea, the lens is the most common eye tissues from UV damage, actinic keratitis and corneal endothelial damage, cataract is with the most sunlight-related eye diseases. Sunglasses to protect the health of the eye, you can choose a function of the lens made of UV sunglasses, try to eliminate the following UV 380nm.
2) the identity of sunglasses for safety performance

    With the safety performance of the sunglasses, the lenses used, such as PC tablets and other impact of the materials, and instructions on the label are often marked with "There is impact resistance," "approved by FDA," "meet the highest European standards", etc. If the product can achieve the requirements on the identification, motorcyclists, drivers and other special requirements for safety of consumers is a good choice.

    Commitment on the product logo, sunglasses, consumers must learn to protect themselves, the label or instructions or save, or let the business stated in the invoice, in the event of disputes, the lack of evidence will not be passive.
3, the inner lens sunglasses have to distinguish the quality of basic skills

    1) the degree of lens sunglasses should meet the requirements for plain lenses and should not affect the vision of the optical flaws. Simple identification method can be placed in front of sunglasses, observe distant targets through a lens, such as window frames or door frames, etc., and then move back and forth up and down the glasses, the goal should not swing and wave-shaped deformation.

    2) the color of lenses that can not be partial, the color of the surrounding environment should be made without distortion, sharp edges of objects in different color lights have a valid identification ability. Lens color depth selection, a place for activities as may be required for different light sources and situations, will affect the color of the lens shading effect. For sunglasses can effectively block Xiaji Jiang light, the color of glasses due to sufficient depth, but those who ride or drive, do not choose too dark sunglasses lenses.

    Susceptible to improper eye wear sunglasses, sunglasses cloudy and there is no need to wear sunglasses indoors. Some people regardless of settings, regardless of the strength of sunlight, even in the dusk, evening, and in movies, television, also wearing sunglasses, which will inevitably increase the burden on the eyes adjust, causing muscle tension and fatigue, vision loss, visual blurring, dizziness and in severe cases, can not long as the other symptoms.