Color-changing lenses, also known as "photosensitive lenses". Because the chemical substance of silver halide is added to the lens, the originally transparent and colorless lens will become colored lens when exposed to strong light to do protection, so it is suitable for indoor and outdoor use.
The chromic lens is made of optical glass containing silver halide microcrystal. According to the principle of reversible light-color tautotransformation, the lens can be darkened rapidly under sunlight and ultraviolet light, completely absorb ultraviolet light, and have a neutral absorption of visible light. Return to the dark, can quickly restore colorless transparent.
The color changing lens is mainly used in the open field, snow, indoor strong light source workplace, to prevent the sun, ultraviolet light, glare on the eye injury.
In plain English, the silver halide in the bright light turns into black silver particles.
How to choose
When choosing color-changing glasses, we mainly consider the functions and characteristics of the lens, the use of glasses, and personal requirements for color. Photochromic lenses can also be made into a variety of colors, such as gray, brown, etc.
1, gray lens: can absorb infrared and 98% ultraviolet. The greatest advantage of grey lens is that the original color of the scene will not be changed by the lens, and the greatest satisfaction is that it can be very effective in reducing the intensity of light. The grey lens can evenly absorb any color spectrum, so the scenery will only be darkened, but there will be no significant color difference, showing the true natural feeling. Belongs to the neutral color system, conforms to all the crowd to use.
2. Pink lenses: This is a very common color. It absorbs 95% of ultraviolet light. If it is used as vision correction glasses, women who must wear them regularly should choose the light red lens, because the light red lens absorbs ultraviolet rays better and reduces the overall light intensity, so the wearer will feel more comfortable
3, light purple lens: and pink lens, because of its relatively deep color, more popular with mature women.
4. Tawny-colored lens: it can absorb 100% ultraviolet light. Tawny-colored lens can filter out a large amount of blue light, which can improve visual contrast and clarity, so it is welcomed by wearers. Especially in the case of serious air pollution or fog wearing effect is better. Generally, they block the reflected light from smooth and bright surfaces, and the wearer can still see fine parts. They are ideal for drivers. For middle-aged and elderly patients with high vision above 600 degrees, priority can be given.
5, light blue lens: the beach beach play can wear the sun blue lens, blue can effectively filter the water and the sky reflection of light blue. Blue lenses should be avoided while driving, as they make it difficult to distinguish the colour of traffic signals.
6, green lens: green lens can it and gray lens, can effectively absorb infrared light and 99% of ultraviolet light. It maximizes the green light that reaches the eye while absorbing the light, so it has a cool and comfortable feeling. It is suitable for people with tired eyes.
7, yellow lens: can absorb 100% of ultraviolet, and can let infrared and 83% of visible light through the lens. The most remarkable feature of yellow lenses is that they absorb most of the blue light. Because when the sun shines through the atmosphere, it appears primarily as blue light (which explains why the sky is blue). Yellow lenses can make natural scenes clearer by absorbing blue light.
For this reason, yellow lenses are often used as "light filters" or by hunters when hunting. Strictly speaking, these lenses are not solar lenses because they barely reduce visible light, but they are also called night vision goggles because they improve contrast and provide more accurate images during foggy and dusk hours. Some young people wear yellow lens "sunglasses" as decoration, glaucoma performers and need to improve the visual brightness of patients can choose.
With the demand of modern life, the role of colored glasses is not only to protect the eyes, it is also a work of art. A pair of appropriate colored glasses, with appropriate clothing, can foil out a person's extraordinary temperament.
Recognize chromatic lenses
The response of a color-changing lens to light is affected by temperature. Lowering the temperature changes the "activity" of the photochromic reaction, slowing down the recombination reaction - the reaction by which the lens restores light - and delaying the color change time. Accordingly, be in the environment with lower temperature, change color glasses is irradiated by light, change color can be bigger, appear darker black.
Because the added silver halide has been integrated with the optical material, so the discoloration glasses can be repeated, long-term use, not only can protect the eyes from strong light stimulation, but also play a role in correcting vision.
Identify strengths and weaknesses
The chameleon mirror automatically changes color according to the change of sunlight intensity, so as to protect eyesight, improve aesthetic feeling, and reduce the stimulation and harm of sunlight and ultraviolet rays to the eyes. When choosing a chameleon lens, it is not a good idea to choose only the right color and not the best quality lenses. A lot of inferior glasses are sold on the market, a pair of coarse glasses without precision processing and inspection qualified, after wearing, you can make you see object distortion distortion, consumption vision, eye fatigue, induce diseases of all kinds of eyes.
(1) High quality color changing glasses lens surface, no scratches, scratches, hairy surface, pitting, the lens oblique to the light observation, high finish. There is no spot, stone, stripe, bubble, crack inside the lens, transparent and bright.
(2) the two lenses of discoloration glasses must be the same color without difference lens, discoloration should be uniform, can not show several colors, no "Yin and Yang color"; As soon as you see the sunlight, the discoloration time is fast, and when there is no sunlight, the fading time is also fast. The inferior lens changes color slowly, fade color quickly, or change color quickly, fade color slowly. The worst color-changing glasses don't color at all.
(3) The thickness of the two lenses of the chameleon should be consistent, not one thick and one thin, otherwise, it will affect vision and damage the health of the eyes. The thickness of a single piece should be uniform. If it is a discolored flat lens, the thickness should be about 2mm and the edge should be smooth.
(4) When wearing, there is no feeling, no dizziness, no eye swelling, observation objects are not blurred, no deformation. When buying, take glasses in hand, look at distant objects with one eye through the lens, shake the lens from side to side up and down, distant objects should not have illusion of movement.
(5) fast color change: high quality chameleon, has a fast response to the environment, the chameleon in the sunlight irradiation for about 10 minutes, that is, should reach the maximum color depth, otherwise the color is poor quality. The glasses that have changed color under the fluorescent lamp are moved to the dark, and the time of lens recovery is not more than 20 minutes for high-quality chameleon.
(6) Protection, high quality chameleon lens, can 100% block UV A UV B, for the wearer to provide the most effective UV protection.
Only the chameleon that meets the above requirements is top grade.
Post time: Aug-04-2021