Under the hot sun, sunglasses have become an essential tool for many people to go out, sunglasses quality directly affects the health of the eye. Optometry, Wenzhou Medical College Hospital, said doctors related to long-term wear low-quality sunglasses can cause eye disease each year, many such patients. Hospital admissions from the situation, the symptoms of photophobia, tearing, eye pain accompanied by vision loss.

Into the summer, sunglasses business is hot on the market, in addition to optical shops have sales, some jewelry stores, flea market also has. Of sunglasses styles, its price is from tens of dollars to several thousand dollars, a lot of sunglasses are labeled "UV", these sunglasses can block UV rays? Quality is satisfactory? Harm, where is inferior sunglasses?

Current News Laboratory, we have chosen the price of six different lens sunglasses for test-related projects. 6 glasses Price high to low numbered 1 to 6, respectively: 1, 2,300, 2nd $ 220 3rd $ 110 4th $ 70, 5, 50, No. 6, 20 yuan, of which 1 sunglasses for a number of international brands; 2 sunglasses as a domestic brand, the rest is brand-name sunglasses.

Experiment Location: Zhe Jiang Taiheng Optical Co., Ltd. Testing Center (the Center National Laboratory Accreditation Board Certificate)

Detection: Optics and optical instruments National Standardization Technical Committee, Zhe Jiang Taiheng Optical Co., Ltd. Japan General Manager TANG; Testing Center Optical Co., Ltd. Zhe Jiang Taiheng inspector Liu Lihua

Experiment I

Test items: the lens transmittance, anti-ultraviolet function, identify the traffic lights and other indicators

Project interpretation: light transmittance of the lens is the detection, transmission rate is not standard, to prevent harmful light performance will be worse, harmful light will affect the eyes; UV feature UV-blocking lenses can injection; identification traffic light is the lens through traffic lights in the ability to correctly identify the colors red, green and yellow.

Test equipment: spectrum analyzer

Test results: 6 transmittance of sunglasses, two indicators identify all qualified traffic lights; 6 sunglasses feature UV protection failed, other sunglasses are qualified.

Experiment II

Test items: balls of light, astigmatism and other indicators

Project interpretation: the degree of mirror balls the size of the test alone; astigmatism is light on the dispersion of the lens after exposure to light. These two indicators are related with the degree of the lens, sunglasses, non-compliance will affect the wearer's vision.

Test Equipment: Optical measuring the degree

Test Result: 6 ball sunglasses indicator light and astigmatism are qualified.

Experiment 3

Test items: clarity index lens

Project interpretation: a direct impact on the lens to see objects definition clarity.

Test equipment: smoke degrees Tester

Test results: 6 sunglasses are all qualified.

Experiment 4

Test items: prism index

Project interpretation: the optical center of the lens prism refers to the accuracy, sunglasses do not meet the requirements of the prism index, after wearing the objects will have to see the offset, this will be a long time to wear glasses dizziness and affect vision.

Test equipment: prism

Test results: 5 sunglasses prism test failed; 1 and 6 sunglasses prism through a national standard indicators and the European standard but not reach the American standard, other sunglasses have passed.

Current experimental results: 6 sunglasses, sunglasses failure 5 and 6. Participate in this experiment TANG said Tuesday, quality testing, including sunglasses, lenses, eyeglass frames and many other items tested, the test only some of the key indicators of lenses tested, the results from the above experiment, the lowest price quality sunglasses the worst, but the price of high quality international brand of sunglasses is not necessarily the best.

Q:

1, tens of dollars can be UV sunglasses why?

TANG said Tuesday, adding anti-UV sunglasses lens, is not technically difficult to achieve, the cost is not high, so in this test, the price of tens of dollars of sunglasses have passed anti-UV detection.

2, the detection index is similar to why the price difference of a few hundred times?

TANG day that the material lens sunglasses as well as price and frames materials, technology and so on, there are some well-known brands brand value-added factor. For imported brands of sunglasses, the need to add import duties and other expenses. Low price sunglasses in the timber, the quality of workmanship will be lacking.

3, wear sunglasses which the note?

Optometry, Wenzhou Medical College, MD, deputy director of hospital outpatient department, said Li Kwok-sing, the human eye in normal sunlight, the pupil becomes smaller, to prevent light entering, and wearing sunglasses, the pupil is relatively larger. If you wear a low-quality sunglasses, you can not very well block the UV, over time may damage the ocular surface or cause the cornea retinal burns, leading to keratitis, cataracts and other eye diseases.

Suggested, enter the room in time off sunglasses, do not wear a long time; stages of visual development in children, need sunlight to stimulate the optic nerve of normal development, inappropriate to wear sunglasses for a long time are likely to cause myopia, amblyopia and other eye diseases; have a history of glaucoma should not be wear sunglasses.

Raiders do not exactly buy sunglasses

Optometry, Wenzhou City, several industry experts to provide optional note:

First, the observation of the lens for scratches, impurities, bubbles, etc., check the packaging of sunglasses, sunglasses should be marked with the regular tag, name tag above will be marked, color, diameter, quality levels, production and the name and trademarks and so on.

Second, the purchase can wear sunglasses to see if comfortable, there is no feeling of vertigo.

Three corners with the hand facing the fluorescent sunglasses, so reflective of the gentle rolling mirror if the mirror reflection of the fluorescent film that appeared wavy, distorted shape, that lens is not flat, so the mirror can damage eyesight.

Fourth, in addition to sunglasses lens colors according to their color, dress to match, it should also be selected according to the environment. Generally better in dark gray, dark brown, brown and other times. Strong in the sunshine outside to choose darker lenses, suitable for driving the subdued color lenses.

Fifth, if the lens color and UV protection are two different things, so be sure to select the function labeled anti-UV lenses.

Sixth, those who choose to have the degree of myopia, with anti-ultraviolet function color glasses, the glasses in the room showed colorless lenses, from indoor to outdoor lens color will gradually deepen.

Seven, cheap sunglasses, their quality is often not guaranteed. To the larger glasses glasses store counter or large shopping malls to purchase, generally the product quality inspection, health inspection, etc. get a better guarantee.

Cheap Reading glasses by the collation and collection