In the previous article, we discussed “Which polarized sunglasses are best?”. In this article, let’s talk about “How do polarized sunglasses work?”.
How do polarized sunglasses work?
Polarizers are lenses manufactured according to the principle of the polarization of light. It is used to eliminate and filter out the direct light in the beam. The light can be input into the visual image of the eye on the transmission axis of the normal track, and the field of vision is clear and natural. Mostly used in sunglasses and camera lenses.
Its working principle is to selectively filter light from a certain direction. A good polarizer will not distort the color of the surrounding environment. With a good polarizer, the edge of the object is clear, and different color signal lights can be effectively identified. Moreover, a good polarizer has the effect of reducing ultraviolet rays entering into the pupil.(https://www.koalaeye.com/collections/polarized-sunglasses)
What are the benefits of polarized sunglasses?
After the natural light is filtered by the polarized lens, it can only let the light in one direction pass, so that the eyes can be well protected from the interference of the messy light. The generally polarized sunglasses on the market are made of fibers sandwiched with a polarizing film. Because of its soft texture and unstable arc, the surface is easily scratched and worn, and not durable.
The polarized lens is formed by pressing multiple layers of thin resin material. Each layer has a different function. The middle layer is the polarizing layer, which can filter out stray reflected light. The second and third layers can filter 99.9% of harmful ultraviolet rays and reduce the light intensity, and the function is no different from ordinary sunglasses. The fourth and fifth layers of polarized lenses are anti-impact layers to make the lenses hard to break. The sixth and seventh layers are strengthened to make the lens not easy to wear. The polarizer can filter out harmful light to protect the eyes.
How To Choose Polarized Sunglasses
Inferior polarized sunglasses will darken the light that enters the human eye, causing the pupils to dilate. In this way, the ultraviolet rays entering the eye will increase leading to increasing the damage to the eye. Therefore, when choosing polarized sunglasses, you should choose high-quality polarized sunglasses. The primary function of polarized sunglasses is to prevent ultraviolet rays and filter polarized light. Good polarized sunglasses lenses can block more than 90% of the penetration of ultraviolet rays. You can choose polarized sunglasses with the 'UV400' logo.
The color selection of polarized sunglasses should be based on the principle that the color of the surrounding environment is not distorted, the edge of the object is clear, and the different color signal lights can be effectively identified. Especially when driving sunglasses, to ensure driving safety. Gray, brown, and green will be better because the lenses of these colors absorb infrared and ultraviolet rays better. Also, they can improve the visual contrast and clarity, and the effect is particularly good when the air is polluted or foggy.
Polarized sunglasses must be comfortable to wear. Inferior lenses have no technology and functionality, and the lens materials are also inferior. After wearing them, you feel discomfort, dizziness, headaches, dry eyes, tingling, etc., so stop using them immediately.
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