What to Look Out for When Shopping for Sunglasses

When you outside, a suitable sunglasses is very important, in the selection of sunglasses we should pay attention to what problems? The first thing you need to do is to listen to what the experts say. Selection of sunglasses should first look at the mirror UV protection and blocking glare function, and then look at the style, price. Specific attention should be paid to the following six aspects of comprehensive consideration.

1. Tinted glasses are not equal to sunglasses, recognize the UV logo UV wavelengths below 400 nanometers, sunglasses should be selected to recognize the "UV400" logo. This logo indicates that they can protect against ultraviolet rays. UV protection and blocking light is the two main functions of sunglasses, the role of the lens color is mainly to block the light, so that people can see things are not blinding, and whether the lens can prevent ultraviolet rays and the color has nothing to do with the main dependence on the lens material and coating.

2. Lens color shades to medium for the best lens color is too shallow, blocking the function of strong light will be weakened, to the sunny place activities, will still feel uncomfortable stinging eyes. Lens color is too deep, will affect the vision, and even interfere with the object color, can not distinguish traffic lights. In general, the medium depth color sunglasses can meet the needs of people's daily life.

3. The specific color of the lens should not affect the color of the object, to ensure the comfort of the eyes on the market sunglasses lens color, mainly teal, gray, green, but also red, yellow and so on. The reason why stronger sunlight will make people uncomfortable to see things, mainly related to the yellow light on the eye stimulation. Generally, teal, gray and green lenses have a stronger ability to block yellow light. The specific color can be based on personal preference, but no matter what color lenses, the color should not be distorted to see things, can effectively identify traffic lights, eyes feel comfortable as a principle.

4. The surface of the lens is smooth, no ripples, bubbles, abrasions, no deformation of vision sunglasses are plano lenses, the surface treatment of the lens, the curvature of the arc, the refractive index are strict standards, especially the refractive index should be within 0.008. Only in this way can you see things without distortion. Otherwise, wearing sunglasses with excessive refractive index, you will feel discomfort and dizziness in your eyes. Judge the quality of the lens is a simple method, is to take the glasses in front of the eyes up and down, left and right slowly moving, through the lens to see whether the object is deformed, look at the good-looking windowpane, door frame and other line objects, if you find that the line is bent, it is shown that the refractive error of the lenses, should not be purchased. In addition, you should also pay attention to whether the surface of the lens is smooth, there should be no ripples, bubbles, abrasions.

5. Do not oversize the frame of the current large frame sunglasses are very popular, quite popular with young people. But the size and style of the glasses should be based on individual eyes and face type. Generally, as long as the lens can cover the eyes, completely block the sun on the line, there is no need to chase the fashionable choice of sunglasses with very large frames. Sunglasses are too large, wide frame will oppress the infraorbital branch of the trigeminal nerve, generally wear these glasses 1 to 2 weeks later, it will lead to eye soreness, orbital or between the two cheeks numbness, dullness of sensation and other discomforts, eye health is not good.

6. crystal mirror can not prevent ultraviolet street stalls or small stores selling teal crystal glasses quite popular with some middle-aged and elderly friends. They believe that wearing such crystal glasses is very eye-catching. In fact, crystal glasses do not have any ultraviolet protection function, can never be used as sunglasses.

Buying sunglasses should first look at the mirror of the ultraviolet radiation and block glare function, and then look at the style, price. If only figure beautiful style or cheap, buy a pair of tinted glasses without UV protection to wear, the harm is greater than not wearing mirrors. Because, the human body has a self-protection reaction, the eyes encounter bright light, the pupil will naturally shrink, so that the eyes into the ultraviolet light to reduce, but if you wear a tinted glasses without UV protection function, the eyes to receive the light intensity of the weakened, the pupil will be enlarged, allowing ultraviolet light invasion.