How to distinguish the UV protection function of sunglasses

by:Timeless Eyeglasses     2021-06-08
u003cbru003eIn the scorching sun, more and more women on the streets are wearing' target='_blank'>sunglasses. While adding a summery charm to themselves, sunglasses can also prevent severe sunlight from irritating the eyes. Recommended reading: Misunderstandings of wearing sunglasses when driving in summer! Many women only choose the style of sunglasses, ignoring internal factors such as color, lens power, UV protection index, etc. Not only do they fail to achieve the proper function of sunglasses, but also cause dizziness, eye swelling and other unsuitable symptoms, sometimes even It can cause unresponsiveness, illusion of color discrimination, unequal vision when walking, and may even cause traffic accidents. It seems that buying sunglasses is really not sloppy. 1. Label: The reason why UV index sunglasses can block ultraviolet rays is because a special coating film is added to the lenses. While blocking and absorbing ultraviolet rays, it also blocks part of the visible light, which reduces the transmittance of the lenses. Therefore, high-quality sunglasses have a strong ability to block ultraviolet rays, the transmittance is not much lower, and the coating film has a certain degree of hardness and is not easy to wear. To distinguish whether a pair of sunglasses has UV protection, you can see obvious signs such as 'UV protection' and 'UV400' on the labels or lenses of some products. 'UV index' is the effect of filtering out ultraviolet rays, which is an important criterion for buying sunglasses. Light with a wavelength of 286nm-400nm is called ultraviolet light. Generally speaking, a 100% UV index is impossible. The UV index of most sunglasses is between 96% and 98%. Sunglasses labeled 'UV400' can protect against more than 90% of ultraviolet rays, and their lenses are specially processed to block ultraviolet rays with a wavelength less than 400nm. Wearing contact lenses can choose contact lenses with anti-ultraviolet function, which can filter out 90% of the ultraviolet rays, and then wear sunglasses, the safety level is even higher. 2. Color: Medium depth is better. The color of the lens should make the color of the surrounding environment undistorted. Before wearing sunglasses, observe red, green, yellow and other colored objects first, then put on sunglasses and observe the same objects. The color of the two observations should not be color cast, otherwise it will reduce the ability to identify traffic lights. According to experts, lenses of different colors have different functions. Generally, medium depth is better, and gray, brown, and green are better. In addition, the lens color selection should be based on the principle of non-distortion of the visual color, clear edges of the object, and the ability to effectively identify different color signal lights. 3. Lens: Check the refractive power. People usually adjust the luminous flux by adjusting the pupil size in the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. Sunglasses can block sunlight to reduce eye fatigue or damage caused by strong light stimulation. Wearing low-quality glasses makes the eyes look like in a dark room, the pupils will become larger, and the residual ultraviolet rays will be injected into the eyes in large quantities, causing damage to the eyes. In addition, the surface of the lens is not smooth and regular, and seeing external objects will produce distortion and distortion, so that the eyeball will be sore, and then there will be nausea, loss of appetite, forgetfulness, insomnia and other symptoms of visual fatigue. In addition, wearing sunglasses indiscriminately on cloudy days and indoors when there is no need to wear sunglasses will increase the burden of eye adjustment, cause tension and fatigue of the eye muscles, and reduce vision. In severe cases, dizziness, vertigo, and inability to see for a long time may occur. symptom. Regular sunglasses belong to the flat lens series. According to the national standard, the diopter tolerance of the flat lens is ±0.08D, and there is no optical defect that affects vision. Once the diopter exceeds the standard, it will make the eyes feel tired, damage the eyesight, and even be 'trained' into myopia or hyperopia patients. There is a simple way to distinguish the quality of the lens: put the sunglasses in front of your eyes and shake it back and forth to see if the object moves with the lens. If you move it together, it means that the lens has refractive power, which will be harmful to your eyes. And the surface of the lens should be smooth, without ripples, flaws, bubbles, and wear marks. Related reading: Sunglasses with UV protection
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