The sun glasses, also calls the sunshade lens, and used as shade.
People usually take in the sun by adjusting the pupil size to adjust the luminous flux, when more than the human eye light intensity adjustment ability, will cause harm to the human eye.
So in the outdoor activity places, especially in the summer, need to use shading mirror to keep out sunshine, to relieve his eyes to adjust the damage caused by fatigue or strong light stimulation.
Sunglasses is a kind of glasses, not only can be used to be cool, more it can use the shading sex that you can look at all on the surface.
At the same time, it is also a way to block the sun's rays glasses.
Dark glasses and sunglasses, it is under strong light eye protection 'labor protection supplies.
So according to the ordinary sun glasses and common glasses actually not much difference, the only difference is the different color, a glasses sunglasses is monochromatic classification, but the color of the sun glasses is in the majority, colorful.
So be sure to distinguish the difference between the sun glasses and sunglasses, but it is difficult to distinguish.
The moment of the more popular the sun glasses is polarized glasses, because the same sunglasses, but the role of polarizing sunglasses function more powerful (
One is the ordinary lens, one is polarized lens)
, including the purchase price is also different, above ordinary sunglasses,
Under the premise of no function)
Basic in 10 - price
Within 100 yuan, but once is with the function of the sun glasses (
Polarized sun glasses)
, the price will change, the domestic price is in 100 - basically
Between 1000 (
The big brands except polarizing sunglasses)
, the function of different, the price of the sunglasses are also different, sunglasses truth in fact is the same here,
The only difference is the different color)
, sunglasses can also be divided into polarized sunglasses and ordinary sunglasses, the price is also and ordinary sunglasses as the difference between a polarized sunglasses.
There are many different kinds of sunglasses, is the only difference is that different lenses.
Wear polarized sunglasses (
Polarized sun glasses)
Can block ultraviolet and infrared light, at the same time, the color of the external environment does not change, only the light intensity change, like a cloudy day, feel cool and comfortable.
Strong sunlight contains a large number of ultraviolet and infrared light, may damage the eye cornea, lens and fundus, even wearing a pair of dark glasses (
The sun glasses)
Part, can block or absorb light, reduce the stimulation to the eyes.
In recent years, because everyone's emphasis on health, many people go out in the hot summer months, all like sunglasses,
The sun glasses)
To reduce the stimulation of the sun, people also like to treat it as a decoration, sunglasses,
The sun glasses)
A lot of more phyletic, should choose according to different needs.
The sun glasses (
Is a kind of to prevent sunlight intense stimulation to the human eye damage eyesight health supplies beauty or personal style of special accessories, people will choose sunglasses according to different requirements (
However, some people in the choose and buy sunglasses (
Often arise when buying after feeling unwell, or glasses quality problems.
1, the first thing to check the quality of the lens, to see if the lens surface is smooth, with or without warping, grinding crack, air bubble.
Lens warp can cause eye deviation, uneven or trace, bubble, can cause discomfort such as dizziness.
Notice also that the lens can't be too thin, also can cause dizziness or high temperature deformation.
2, can send the sun glasses (
Get 45 centimeters from the eye, through the glasses look around vertical line and horizontal line, such as frame window or door frame, etc. , then glasses from top to bottom and move around.
If the linear distortion or swing, indicated that the lens distortion, unfavorable buy.
3, the sun glasses,
There is also a important indicator light transmittance, is through the lens of the luminous flux and the ratio of the incident light flux, is also a important performance index of the mandatory standards.
If use light color sunglasses for shade, the wearer will not be able to obtain the shading effect.
Use shading light color sunglasses in the mirror, affect the wearer clarity of vision.
4, the sun glasses (
At present, observations of distant places through the lens, such as the window or door frame, then glasses from top to bottom and move around, goals should not have swings and wavy deformation.
Can also be observed under fluorescent lamp images on the surface of the lenses, turn the sunglasses make tubes images appear in different parts of the lens, lamp image deformation is the best.
The polarized sunglasses on the market, some products using thickness of 0.
7 mm resin polarized lens, due to the thin lens, is easy to produce deformation in the assembly, when the choose and buy should pay special attention to.
5, the color of the lens can't partial, should make the distortion of the color of the surrounding environment.
Before without wear sun glasses to observe the color such as red, green, yellow, and then put on sunglasses, observing the same object, observe the color of the two can't partial color, otherwise it will reduce the recognition ability of traffic lights.
For lens for color, particularly bright sun glasses should pay attention to the identification.