Mistakes in choosing sunglasses – a simple understanding of sunglasses

Introduction: Many small holidays every year, after a long period of hard work, often many people can't wait to prepare for the trip, so before the trip, is your equipment ready? In the outdoors, the seaside, the mountains, the wild open land, sun exposure, ultraviolet radiation is severe, on the eyes and skin, there are a lot of damage, among which sunglasses are indispensable, can protect ultraviolet rays, protect eye vision, and can even decorate cool, to a set of fashion display. Let's take a brief look at sunglasses:

Myth 1:

All sunglasses are 100% UV protected

Let's first understand ultraviolet rays, which have a wavelength of 400 UV or less, and damage to the cornea and retina after irradiation of the eyes, resulting in solar keratitis and corneal endothelial damage.

Good sunglasses should absorb or reflect ultraviolet rays to block out the exposure to the eyes. Sunglasses with anti-ultraviolet function generally have several explicit ways: 1. Label "UV400": it means that the wavelength of lens isolation to ultraviolet rays is 400nm, that is, its maximum spectral transmittance below 400nm cannot be greater than 2%. 2. Marked "UV" and "UV protection": indicates that the blocking wavelength of the lens to ultraviolet rays is 380nm. 3. Label "100% UV absorption": It means that the lens has 100% absorption function for ultraviolet rays, that is, the average transmittance in the ultraviolet range is not more than 0.5%. Generally, only sunglasses with the above marks can be called sunglasses that have protection against ultraviolet rays in the true sense. Misunderstanding two: Polarized sunglasses than ordinary sunglasses The so-called polarized sunglasses are that in addition to the function of sunglasses, they can also weaken and block the messy reflected light, glare, irregular reflections of objects, etc., and put the light transmission axis into the eye vision to make the vision rich in layers and the vision clearer and more natural. Polarizers are generally suitable for outdoor activities such as driving, fishing, sailing, boating, skiing and so on. Since polarizer lenses are generally darker, it is not necessary to wear them on cloudy days or indoors, but should choose some ordinary sunglasses to protect your eyes from ultraviolet rays. Myth 3: In our daily life, sunglasses always seem to be remembered in the summer when it is easy to burn the eyes by the scorching sun.

In fact, sunglasses do not only need to be worn in summer, the purpose of wearing sunglasses is mainly to block ultraviolet rays and shade, and ultraviolet rays exist throughout the year, that is, sunglasses can be worn all year round.

Myth 4: Although the lens materials of high-quality sunglasses are special materials, they will also age over time. Incorrect wearing habits may also damage the sunglasses, and even cause deformation, loosening, and reduce the service life. Therefore, it is recommended to replace with new sunglasses in 1-2 years. Myth 5: Children and the elderly are not suitable for wearing sunglasses? Our default notion is that neither the elderly nor children are suitable for wearing sunglasses, and sunglasses are exclusive to young people. No, for the elderly, wearing sunglasses is a positive way to protect your eyes. Elderly people with eye diseases such as keratitis, retinal detachment, cataracts, etc., wearing sunglasses is more conducive to the delay and recovery of the disease. However, people with color blindness and night blindness should not wear it. Children under the age of six should not wear sunglasses, their visual function is not yet mature, and they need more sunlight stimulation, at this time, wearing sunglasses will affect visual development or form amblyopia. Myth 6: The transmittance ratio, also known as the transmission coefficient, is the ratio of the amount of light transmitted through the material or medium or auxiliary flux to the amount of incidence. The transmittance ratio does not represent the quality level of the glasses. Many glasses hangtags will have different words such as 0, 1, 2, 3, 4, etc., which have the following meaning: 1." A rating of 0 indicates that it is suitable for cloudy days. 2. The "1" grade indicates that it is suitable for cloudy weather. 3. The "2" rating is suitable for sunny weather. 4. The "3" rating is suitable for weather with strong sunshine.

5. The "4" level is suitable for snow or seaside.

After the above brief introduction, you have a certain understanding of your sunglasses! Of course, ordering in a regular manufacturer, or purchasing in a regular optical store, it will be relatively reassuring.

                                                                                                              Shenzhen HandOptical Manufacture Co., Ltd