Every person who dispenses glasses online seems to be opening a blind box after receiving the courier. Whether you are satisfied or not depends on luck. So is online mirroring reliable? At the same time, what are the lightning points that need to be paid attention to?
1. The optometry document is not a prescription for glasses
Simple refraction data can not be used as a prescription for glasses, professional optics after optometry, will be the analysis and modification of the results of the visual function examination, such as myopia external occlusive oblique to be corrected by foot correction, hidden oblique under-correction, hidden strabismus with diopter modification, etc., adjustment of advanced, lagging is also the modification factor of the refractive diopter, refractive unevenness caused by unequal image, a dominant eye detection, new and old glasses parameter comparison, etc. are also factors in the modification of the degree of optics, and the glasses can only effectively protect vision if they reach the basic requirements of comfort and clarity. Mirror dispensing is not as simple as providing diopter and interpupillar distance.
Second, the parameter self-test is not accurate
For the pupil distance, some online stores let customers use a ruler to measure the operation of the pupil distance is not advisable, the physical store professional optometrist rarely uses the ordinary ruler to measure the pupil distance, the accuracy of the use of professional instruments and equipment is not non-professional with the ruler measured out of the data comparable. Long-term wearing of glasses with inaccurate interpupillary distance will produce a prism effect, causing eye fatigue, it is recommended that you still have the best to go to a professional optics center or a physical store to consume glasses, do not hurt the eyes for greed and cheapness.
Third, use the old mirror degree as a prescription for the new mirror
In addition, in order to save trouble, some people use their old mirror power to test new glasses when shopping online. In fact, even if the degree of myopia or astigmatism in adults does not increase significantly, the axial direction of astigmatism may change, so it is necessary to pre-refract each time a new lens is changed to determine a new prescription. Moreover, the parameters of the new frame are different from the old frame, and if you do it exactly according to the parameters of the old mirror, even if the same degree is not changed, there may be discomfort. This is why some people, whether they are online shopping or physical stores with glasses, the degree has not changed, but there will still be discomfort in wearing.
Fourth, the selection of lenses is all up to your own will
Many people choose lenses, they think that the thinner the better, in fact, the thickness of the lenses, refractive index and whether functional lenses are needed are different from person to person. And these are to rely on professional medical institutions and professional optometrists, online glasses will not have relevant professionals to provide one-on-one private customized services. In addition, the choice of good lenses does not guarantee whether there will be a situation of stealing beams and changing columns.
Fifth, the after-sales service is uneven
Even if you have a suitable pair of glasses, if you encounter some glasses that need to be repaired, whether there is a complete after-sales guarantee depends on luck, and even some stores do not have after-sales service.
In general, online dispensing needs to be cautious. A suitable pair of glasses includes at least the following factors: frames of qualified quality and suitable for individual diopter and interpupillary distance, optical lenses of qualified quality, spectacle fitting processing in line with national standards, appropriate refractometry, and adjustment of the position of glasses in line with facial conditions.
Buying glasses online is indeed cheap, but it is difficult for consumers to judge the quality of glasses and the qualified processing. Long-term wearing of unqualified glasses will undoubtedly pay more attention to fatigue, affect the quality of life, study, work, and more serious will damage visual health and even cause overall health problems.
bibliography:
1. Anon. Adaptation?" Adapt to "No! [J]. China Journal of Glasses Science and Technology, 2020(9):74-75.
2.Wu Huasheng. A Brief Analysis of the Disadvantages of Network Optics[J]. China Journal of Glasses Science and Technology, 2015(13): 132-135.
3. Focus on revealing the "secret brother" for 20 years.100,000 whys of the network optics edition[J].China Journal of Glasses Science and Technology, 2016(09):64-65.
4. Anon. Network mirrors, how many hidden worries? [J]. China Journal of Glasses Science and Technology, 2017(12):135.