Buy sunglasses, introduce polarization, what does polarization mean?

In the summer, many people are inseparable from sunglasses, especially when the sun is relatively large, a good pair of sunglasses is very important for the eyes. So do you know what polarized sunglasses mean? Let's take a look.

Polarized sunglasses are a type of sunglasses. Polarization can be divided into three types, namely linear polarization, elliptical polarization, and circular polarization. Generally, the so-called polarization refers to straight line polarization, also known as plane polarization.

The vibration of this light wave is fixed in a specific direction, the propagation path in space is a sinusoidal curve, and the projection in the plane of the vertical propagation direction is a straight line.

The plane composed of the vibration direction and the propagation direction of the linear polarization light is called the vibration surface, and the plane that is perpendicular to the vibration direction and contains the propagation direction is called the polarization surface. By passing natural light through a polarizer, a straight line of polarized light can be obtained, which is often used in crystal optics research.

Are sunglasses harmful to the eyes.

Wearing sunglasses outdoors in the summer is also a form of eye protection. However, ophthalmology experts stress that it is important to wear qualified sunglasses.

A pair of qualified sunglasses must be able to block ultraviolet rays from passing through, have good resolution for traffic signals of different colors, and regular sunglasses belong to the flat lens series, and the diopter is strictly controlled below the degree. An ophthalmologist said that in her outpatient clinics, she often encounters patients who are tearful and photophobic when they wear sunglasses. Most of the sunglasses they chose were red, green, and green, which was contrary to medical beliefs about light colors.

In fact, brown, pale green, etc. are good eye colors. Wearing glasses that are too dark will put the eyes in a darkroom environment, and the pupils of the human eyes will automatically dilate in a dark environment, and long-term dilation of the pupils is easy to cause glaucoma and other diseases.

Precautions for wearing sunglasses.

1. It is not advisable for children to wear sunglasses for a long time.

When there is particularly strong sunlight outside, you can wear it, and you don't usually need to wear it. It is best not to wear it when it is dark, so as not to have unclear vision, affect vision and be prone to danger. In addition, when entering the room, let the baby take off the glasses as soon as possible, so that the pupils will contract naturally, otherwise it will increase the burden on the eyes, which is not conducive to eye health.

2. You can't wear glasses when you're sick.

For some people who have a family history of glaucoma or if the child is suffering from pink eye, high intraocular pressure, high blood pressure, etc., it is best not to wear sunglasses. No matter what kind of sunglasses, it will weaken the entry of light to varying degrees, and the pupils of the sick child's eyes will naturally dilate in order to see clearly, which will further increase the already high intraocular pressure, which can easily lead to the deterioration of the condition, with symptoms such as eye redness and vomiting, and severe blindness.

Wearing sunglasses is also a lot of exquisiteness, after reading this article, I believe you already have a preliminary understanding. Hope it helps.

Sunglasses are polarized and unbiased, and many people buy glasses without noticing this and buy glasses that are not suitable for them. What does polarized sunglasses mean? Is it better to polarize or not polarize sunglasses? How can you tell if your sunglasses are biased?

What does polarized sunglasses mean?

Polarized sunglasses block uncomfortable glare while protecting the eyes from UV rays. All of this is possible thanks to metal powder filters, which "select" light when it hits it. Polarized sunglasses selectively absorb some of the wavelengths that make up the sun's rays because they use very fine metal powders (iron, copper, nickel, etc.).

In fact, when light hits the lens, it is reduced due to the so-called "destructive interference" process. That is, when certain wavelengths of light (in this case, ultraviolet A, ultraviolet B, and sometimes infrared) pass through the lens, they cancel each other out on the inside of the lens, i.e., in the direction of the eye.

Principle example: Drivers should empathize with the problem of reflective road light, using polarized sunglasses can reduce the transmission of light, because it does not allow light waves that vibrate parallel to the road to pass through. In fact, the long molecules of the filter layer are directed horizontally and can absorb horizontally polarized light.

In this way, most of the reflected light is eliminated without the entire illumination of the surroundings being reduced.

Is it better to polarize or not polarize sunglasses?

Sunglasses that are not polarized generally only have the two basic functions of blocking strong light and filtering ultraviolet rays, and their efficiency in filtering ultraviolet rays is low. However, do you know that in our daily life, in addition to strong light and ultraviolet rays, light will also produce irregular diffuse reflection light when passing through uneven roads, water surfaces and other places, which will cause blurred vision and fatigue of the human eye?

Polarized sunglasses, on the other hand, can filter out this type of light, absorbing only the reflected light of the object itself, and truly presenting what you see, making the vision clearer, thereby reducing visual fatigue. In addition, polarized sunglasses have a blocking rate of 99% for ultraviolet rays due to their high-efficiency filter layer, which can effectively reduce the damage of ultraviolet rays to the eyes.

To sum up, it is better to use polarized light for driving.

1. What are polarized sunglasses? Polarized sunglasses are sunglasses with polarized lenses. Its principle is like a louver early knowledge window, through a large number of filaments parallel to the horizontal plane, a part of the reflected light and diffuse light are shielded on the premise of causing visual blind spots.

2. Polarized sunglasses are sunglasses with polarized lenses. Its principle is like a blind, through a large number of parallel filaments that rot on the horizontal plane, a part of the reflected light and diffuse light are shielded on the premise of causing visual blind spots.

3. Polarized sunglasses have a better visual experience than other categories when wearing eyes in snow, water driving, etc. However, for decoration, because the polarizing fiber has a gray background and a primary color, the color cannot be bright and bright.