Briefly Describe Your Sunglasses Shopping List

1. Instinct of human have ego to protect, eyes meet with strong light, the pupil will naturally become smaller, cut into the eyes of uv energy, once without uv protection function on the glasses, can make the pupil dilation, plus the role of the glasses not isolate uv, at this moment is equal to the portal open eyes, let the ultraviolet light to enter, damage to the eyes. 2. Sunglass can hold back ultraviolet ray, because a special besmear film was added on lens, and inferior sunglass not only cannot hold back ultraviolet ray, still let lens transmittance drop seriously, make pupil greatens, ultraviolet ray can shoot in large quantities instead, your eye is damaged. In addition, poor quality lenses also cause nausea, forgetfulness, insomnia and other symptoms of visual fatigue. 3. The color of sun lens is superior with light gray, tawny or light smoke, it is green, amber, blue to wait next, red is used as sunbath or snowfield only. 4. It is best to use polarized sunglasses when riding in a car, because they can reduce the glare of bright light.

An Introduction To Lenses Of Different Colors

Yellow Lens: Strictly speaking, these lenses are not solar lenses because they do little to reduce visible light, but in foggy and dusk, yellow lenses can increase contrast and provide a more accurate view, so they are also called night vision goggles. Some young people wear "sunglasses" with yellow lenses as decoration. Light blue: light pink and other lenses: same decorative more than practical lenses. Dark green lens: absorb hot gas, bring cool and refreshing feeling, but translucent luminosity and clarity are lower, suit to wear when basking in the sun, unfavorable when driving. Blue lenses: you can wear sun blue lenses when playing on the beach. Blue lenses can effectively filter out the light blue reflected by the sea water and the sky. We should avoid using blue lenses when driving because they can confuse us with the color of traffic signals.

Types And Characteristics Of Sunglasses Lenses

(1) Grey piece: Gray lens can be evenly absorbed to any color spectrum, so the scene will only be darkened, but there will be no obvious color difference, showing the real natural feeling. It's a neutral color. (2) Tan lens: filter out a lot of blue light, can improve the visual contrast and clarity, in serious air pollution or foggy wear effect is better. Generally, it can block the reflected light from the smooth and bright surface, and the wearers can still see the subtle parts, making it an ideal choice for drivers. (3) Green lens: While absorbing the light, it maximizes the green light reaching the eyes, so it has a cool and comfortable feeling, suitable for people with tired eyes. (4) Blue gray lens: similar to gray lens, both belong to neutral lens, but the color is darker, the visible light absorption rate is higher. (5) Mercury lens: the surface of the lens adopts high-density mirror coating. Such lenses absorb more reflected light and are suitable for outdoor sports.

A General Introduction To Sunglasses Lenses

Change color lens: also someone is called "photosensitive lens". Because silver halide chemicals are added to the lenses, the originally transparent and colorless lenses will turn into colored lenses when exposed to strong light for protection, so it is suitable for indoor and outdoor use at the same time. Sunglass clip: Sunglass clip is a polarized sunglasses designed for myopic people. It can effectively prevent dazzle and ultraviolet rays. Especially suitable for driving, outdoor, fishing and other outdoor sports. By using polarizing lens technology, the resolution of the image is greatly improved. Eliminate 99% of the reflected light and scattered light, making your field of vision clearer and smoother. The lens is specially reinforced with film, effective degree of wear resistance, scratch resistance and impact resistance. Night driving lens: night driving lens should be able to stop the other car light by more than 80%, and the main lens light transmittance must > 75%, observe the roads are not affected, wear a good pair of driving at night night vision goggles, motorists can not only see road pavement, but also can effectively weaken the other car by dazzling light glare from headlights and other harmful light, in block light can see the road at the same time, to ensure your safety.

Classification Of Sunglasses Lens Introduction

1. Anti-reflective protective lenses: These are lenses that are coated with a thin layer of magnesium fluoride to prevent bright light from reflecting off, allowing you to see more clearly and without interference from bright light. To test if your sunglasses really have anti-reflective protection, point them at a light source. If you see a purple or green reflection, that means the lenses are coated with an anti-reflective film. 2. Colored lenses: Also known as "colored lenses," chemicals are added to the lenses to give them color that absorbs light at specific wavelengths. This is the type of lens most commonly used in sunglasses. 3. Colored lens: This kind of lens presents the same effect as colored lens, but the way it is made is different. It is painted on the surface of the lens. In general, the sun glasses with a degree are usually treated by coloring the lens. 4. Polarizing lens: in order to filter the sun on the water, land or snow on the equal direction of the harsh light, in the lens to join the vertical direction of special paint, called polarizing lens. Ideal for outdoor activities (e.g., sea activities, skiing or fishing).

Classification Of Sunglasses For Use

Sunshade, as the name implies, is used for shading. People usually adjust the light flux by adjusting the pupil size under the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause harm to the human eye. So in outdoor activities, especially in the summer, many people use sunshades to block the sun, to reduce the eye adjustment caused by fatigue or injury caused by strong light stimulation. Light-colored sunglasses do not block the sun as well as sunshades, but they are colorful, suitable for use with all kinds of clothing, and have a strong decorative effect. Light color sunglass because its colour is rich, design is diverse, got the favor of young gens, fashionable woman is doted on to its more have add. Special purpose sunglasses have a strong function of shielding sunlight, often used in the beach, skiing, mountain climbing, golf and other fields with strong sunlight, its anti-ultraviolet performance and other indicators have higher requirements.

The Benefits Of Wearing Sunglasses

If sunglasses don't provide UV protection, they can expose you to more UV light. Cheap sunglasses filter out some of the light, causing your iris to open to receive more light. This also allows more UV rays to enter, increasing the damage they can do to the retina. Therefore, there is a difference between the various types of sunglasses. Choosing the right, high-quality sunglasses for the specific environment will provide you with the most protection. According to the regulation of international standard, sunglass is listed as the category of things for personal eye protection. The main function of sunglasses is to block the glare of the sun. However, international standards subdivide sunglasses into "fashion mirror" and "general purpose mirror". The quality requirement of "fashion mirror" in the standard is relatively low. Because "fashion mirror" is primarily about style, the wearer pays attention to decoration rather than protection. The standard has more stringent quality requirements for general purpose mirrors, including UV protection, as well as index requirements for diopter and prism.

The Basic Functions Of Sunglasses

UV rays can damage the cornea and retina, and good sunglasses can completely eliminate them. When the eye receives too much light, it naturally contracts the iris. Once the iris has contracted to its limit, then people need to squint. If there is still too much light, such as sunlight reflected off snow, it can damage the retina. Good sunglasses can filter out up to 97 percent of the light entering the eye to avoid damage. Certain surfaces, such as water, reflect a lot of light, and the resulting bright spots can confuse the view or hide objects. Good sunglasses can completely eliminate this glare using polarizing technology, which we'll discuss later. Some frequencies blur the eye, while others enhance contrast. Choose the right color for your sunglasses to make them look better in certain circumstances.

The Principle Of Color Changing Glasses Is Introduced

The lenses of color changing glasses darken when the sun's rays hit them. When the light faded, it became bright again. This is possible because the crystal of silver halide is at work. Under normal conditions, it keeps the lens perfectly transparent. Under sunlight, the silver in the crystal is separated, and the free silver forms small aggregates inside the lens. These small silver aggregates, irregular patches with interlocking teeth, do not transmit light but absorb it, which darkens the lens as a result. In the case of dim light, the crystals form again and the lens returns to its bright state.

Wear Effect Of Polarized Glasses

Polarizing glasses offer another mechanism for eye protection. The reflected light of asphalt is a special kind of polarized light. The difference between this reflected light and light coming directly from the sun or from any artificial source is a matter of order. Polarized light is made up of waves that vibrate all in one direction, whereas ordinary light is made up of waves that vibrate not in one direction. This is like the contrast between a crowd of people moving at random in disorder and a group of soldiers marching in orderly steps. In general, reflected light is an ordered kind of light. Polarized lenses are particularly effective at blocking this light because of their filtering properties. The lenses allow only polarized waves that vibrate in a certain direction to pass through, as if combing light. For road reflections, the use of polarizing glasses reduces the transmission of light because it does not allow light waves vibrating parallel to the road to pass through. In effect, the long molecules in the filter layer are directed horizontally and can absorb horizontally polarized light. In this way, most of the reflected light is eliminated, while the overall illumination of the surrounding environment is not reduced, and the polarizer can face the sun directly.

The Effect Of Sunglasses Is Introduced

Sunglasses can shield your eyes from uncomfortably bright light while also protecting your eyes from the harmful effects of ultraviolet rays. All this is thanks to metal powder filters that "select" light as it comes in. The tinted glasses selectively absorb some of the wavelengths that make up the sun's rays because they use very fine metallic powders (iron, copper, nickel, etc.). In fact, when light hits the lens, it is subtracted by a process called destructive interference. That is, when certain wavelengths of light (UVA, UVB, and sometimes infrared) pass through the lens, they cancel each other out on the inside of the lens, toward the eye. The overlapping of light waves is no accident: the crest of one wave and the trough of a nearby wave combine to cancel each other out. The phenomenon of destructive interference depends on the refractive index of the lens, which is how much light diverges as it passes through different substances from the air, and also on the thickness of the lens. Generally speaking, the thickness of the lens does not vary much, while the refractive coefficient of the lens varies according to the chemical composition. And sunglasses should not come into direct contact with the sun.