Buy sunglasses should pay attention to the eight items
Depending on the inferior sunglasses is not clear and can't resist the ultraviolet ray, the result is a pupil dilation, make the eye lens to absorb more ultraviolet ray, so be sure to choose a promise good stores procurement. It's better to buy sunglasses should pay attention to what? First, the first observation lenses have scratches, impurity, air bubble, stripes, check the packing for sunglasses, specification of sunglasses should be marked with name, colour, diameter, quality grade, produce name and trademark, the mirror or tags are marked as both UVA and UVB rays and CE mark of the second, choose and try to put on the sunglasses have dizziness, headache, feeling. Now there are some marked degree of myopia sunglasses on the market for sale, but because of pd and other indicators vary from person to person, so if there is no guidance of professional personage, consumer is better don't choose this kind of prescription sunglasses. Third, use sunglasses two horns on the fluorescent lamp in hand, let the mirror reflective steep rolling, if it is found that mirror the daylight lamp shades appear wavy, distort, prove that the lens is not flat, the mirror can damage eyesight. Fourth, the lens should level off, acuity is higher, the sun glasses have glass and resin raw materials, and the sun glasses should choose the polarized lens. Its selection and fine contact lenses in the same light made of synthetic resin, synthesized from seven layer chip, two outside layer is hard wear-resisting layer; Second, six is shatterproof strengthening layer; The third and fifth layer is the uv filter layer, the center layer is a polarizing filter layer. Polarized lenses can effectively filter out reflected light and harmful uv rays, and has the function, such as shatterproof, wear is prevalent sunglasses. Fifth, the colour of the sunglasses in addition to the basis for its color, face, wear to allocate, should also be on the basis of in and out of places to choose from. In general, black, dark brown, grey filter effect is good; Grey lens for any chromatography can balance absorption, wearing glasses can see scenery will only after dark and do not have clear off color, Dark brown lens can filter out a lot of blue light, it can improve visual contrast and clarity, under the condition of air pollution is serious, or foggy wearing effect is a plus. Sixth, depth of colour for our sunglasses? Simple self-test method is to wear sunglasses, in front of a mirror to vaguely can see the pupil of themselves to the limit. Colour is too light filter effect is too small; Colour is too deep, affect vision and weaken the sense of color. Popular this year the colorful light of the sun glasses, do not use in the coastal water activities, reflective snow and the sun is very strong sun, and should wear sports sunglasses, most of them choose colorful saturated color, to absorb or reflect more visible light. Seventh, wearing sunglasses in addition to reduce glare stimulation, make eyes comfortable outside, the main purpose is to prevent ultraviolet damage to eyes, and lens color and UV protection are two different things, even if the lens color is deep, also may not be able to effectively prevent UV, UV proof was shown so be sure to select the function of the lens. Usually sunglasses UV index at 96% 98%. Eighth, general specification optician will have sunglasses resist ultraviolet radiation to the size of the measurement instrument, after the test, you will be able to know whether their glasses eyes are helpful for your health. What is a good color sunglasses? On the selection of lens color, from the perspective of the effect of keep out light, should as far as possible choose grey and dark brown sunglasses, the color of the lens compared to other color, more can effectively keep the colour of the object itself, and be able to filter ultraviolet harmful substances. Some children to play 'cool', indoor and outdoor wear sunglasses. This is not desirable, as the eye can wear sunglasses outside, but inside should remove sunglasses, because indoor light is dark, wearing dark sunglasses can cause long-term tired eyes, eye muscle caused by serious, blurred vision.
related: sunglasses polarized sunglasses
related: sunglasses polarized sunglasses