Online Glasses Shop Low price temptation, purchase also need to be careful

Near the beginning of the school, students change glasses ushered in the peak, online glasses shop to attract students with low-cost preferential mirror, quote from 19 to 59 yuan. Reporter recently bought 4 pairs of glasses, sent to the formal entity store test. The results showed that the pupil distance of 4 pairs of glasses had errors, the maximum difference was 10mm, 4 times times more than the allowable error. Glasses are used in the lens of the low price of the spherical resin lenses, frame of the material for ordinary.

Beijing Tongren Hospital Optometry Center doctor and Professional optician introduced, pupil distance is not allowed to cause eye fatigue, will lead to distorted vision, increase degrees. Although spherical lenses can also be used, but easy to wear, and produce a poor view, long-term wear will have a feeling of discomfort, affect the line of sight. But the common resin frame is easy to break, the hardness is big to the facial oppression. Therefore, we recommend that you should go to the hospital or glasses shop before the mirror, professional pupil distance and degrees.

Found

Buy glasses online

Pupil distance

"Students with mirrors, ultra-low-priced packet mail!" "Near the beginning of the school, many of the glasses shop Taobao launched a preferential activities, students with myopia glasses can enjoy a discount, with a pair of glasses only fifty or sixty yuan, some businesses offer even low to more than 10 yuan." "Low price, but are professional computer optometry with mirror, 365-day warranty." A shop customer service said.

"Tell me about the degree of myopia and pupil distance on the line." "In an online shop, the reporter to buy glasses in the name of the consultation seller, the seller said to choose a good frame, as long as the data to him, you can."

Reporters said they remember the degree of myopia, but not clear pupil distance is how much, "pupil distance to go to the hospital or the optical shop measurement." "The seller said that if you cannot go out to measure, you can also" self-test. "Take your ruler, and follow the pictures I send you, and record the numbers," he said. Then a schematic of the pupil's distance is sent.

The reporter sees the picture to discover, the figure only introduced "pupil distance is what", did not introduce how to measure. (Legal evening paper/photo)

Test

Are these dozens of-dollar glasses really what the seller says is "Guaranteed quality"? Reporters according to the former in the formal store with the mirror data sheet, randomly purchased in 4 shop a pair of glasses, sent to the regular physical stores for testing.

Test equipment: Computer optometry machine, focal degree meter (professional instrument, measuring lens degree, Metrology Accreditation Authority Certificate No.: "State" law "2012" 01007), the ruler (special ruler, test pupil distance), 4 pairs of glasses, glasses frame material are plates, the price is 19 to 59 yuan, respectively, marked as a, B, C, D.

Tester: Beijing "comprehensive" glasses shop junior Optometrist

Test 1 degree measurement

Steps: The four glasses are placed on the focal degree meter to measure the degree, the instrument automatically read out the degree of glasses, and display on the screen.

Interpretation: The results show that the degree of 4 pairs of glasses is consistent with the degree provided by the reporter.

The optometrist says that the machine that tests the degree of glasses is the same, whether it is in the glasses shop or the hospital, and the test results are the true degree of the lens. In addition, the lens factory, the degree is fixed, "as long as the degree of optometry to do no problem, unless the processing master took the wrong lenses." ”

Test 2 pupil distance measurement

Steps: 1. Self-test pupil distance by seller (3 times)

2. The optometrist measured pupil distance (3 times)

3.4 pairs of glasses in the focal degree of the Mark lens light heart, the use of professional measuring pupil distance of the ruler to measure, record data.

Test results: Self-test and optometry pupil distance

Self-Test Light Division

First 62mm 62mm

Second 58mm 62mm

Third time 60mm 62mm

Measuring pupil spacing of lenses

The pupil distance of the glasses measured by the reporter is the difference

A 59mm 62mm 3mm

B 72mm 62mm 10mm

C 64mm 62mm 2mm

D 69mm 62mm 7mm

Interpretation: From the test results, the pupil distance of 4 pairs of glasses appear deviation, the maximum difference is 10mm. This morning, Tongren Hospital Optometry Center related responsible Person said, pupil distance is not correct performance, through the lens of the object to find displacement or distortion distortion, wearing a feeling of discomfort. What you see is not the clearest. The higher the degree, the greater the distortion and vertigo.

The director said that the pupil distance test errors are GB, the degree of different pupil distance is also different, the smaller the degree of error allowed smaller, the other is large. Tongren Hospital doctor said, according to the relevant national standards of eyeglasses processing, more than 300 degrees of pupil distance allowable error of 2mm. 10mm error, 4 times times more than the allowable error, will make people wear dizziness, discomfort. In addition, the pupil spacing is not allowed to increase the degree of growth.

Test 3 Mirror Contrast

According to the optometrist, there are two kinds of lenses available on the market, aspherical and ordinary spherical lenses. Aspheric lenses have a thin texture, a wider field of vision, no deformity on the edge of the lens, a heavier spherical lens, and an aberration in the peripheral field of vision. At present, aspherical lenses are gradually replacing the traditional spherical lenses.

Steps: 4 pairs of glasses of the lens on the grid paper, observe the box changes.

Experimental results: Whether the glasses are curved

A is B is C is D is

Interpretation: The optometrist said that the grid paper bending, indicating that these 4 pairs of glasses are ordinary spherical lenses. "Simply put, the ordinary spherical surface is easy to wear, short life, long time wear will affect the eyesight." Now everyone pay attention to eyesight protection, so the match is also less. "he said.

Beijing Tongren Optometry Center related officials said that their differences are mainly reflected in the comfort, aspherical more comfortable, thinner mirror. Ordinary spherical surface, if the degree is high, the lens will be very thick, wearing uncomfortable.