HOW ABOUT RESIN LENSES？
How to judge resin len？
1, see whether the transmittance is good, see whether there are bubble impurities.
2, see the hardness of the lens, resin lens itself due to the low hardness before they leave must go through strict surface hardened treatment can satisfy the requirement of the wear resistant, otherwise generally after wearing two or three months 'chafed on the surface of the lens is serious, can't even wear, and the hardness resin lens wear resistance much better qualified, wearing only a few scratches, a few months later and will not affect the wear.
3, look at the color, high quality resin lens without any background color (if the coating lens film layer with color), and inferior lens background color slightly green, and easy to yellow after wearing for a period of time.
4, inferior resin lens center thickness is thin, the edge looks than thin lenses to some of the same refractive index, the sacrifice center to make the thickness of the lens is thin, it is wrong, because of different resin lens and glass lenses, known as the "safety glasses", the minimum is a requirement for the thickness of the center, to wear such a lens is security at the expense of sacrificing your eyes.
If you can't accurately identify inferior resin lenses, you'd better go to a reputable large optical shop to get resin lenses.
The purchase strategy of resin lens
1.Brand
What is a brand is a product that is widely recognized and praised by the industry and customers in the retail market.The quality of this kind of lens can reach A-level, of course, the price is also the highest, A pair of 1.56 refractive index added film lens is at least more than 500 yuan, in Europe and the United States, belongs to the popular lens, in China, or A few people will choose luxury.So how about domestic brands? In fact, many products of the above-mentioned brands are produced in China, and many packaging places are made in China. So we should not blindly believe in imported lenses.Many materials of domestic products rely on imports from Japan and South Korea, and the internal testing standards of the enterprise are divided into A, B and C levels.A-level is generally used for export or OEM of first-tier brands, while B-level manufacturers generally create their own brands for retail stores to sell, quality and price are very good.Such as 1.56 lens, retail market 100-200 products.C-level will generally enter the wholesale market and supply scattered customers and customers in remote areas. The price is cheap. In many small retail stores in big cities, the special
price of frames and lenses is basically this kind of products, such as package and 3-4 discount of 100 yuan.
2.Refractive index
The refractive index determines the price of the lens.The following is a list of refractive indexes and a brief description. We only talk about domestic brand lenses above grade B.
1.50(1.499) the most common resin lens on the market, the refractive index is relatively low, myopia can be up to 600 degrees, the lens edge is relatively thick if the frame is slightly larger.The price ranges from 50 to 200, suitable for primary and middle school students, degrees often change, need to change the lens, the price is relatively cheap.
At present, the more popular resin lens, medium refractive index, commonly known as ultra-thin, but now, should be called in the refractive lens, conventional to 800 degrees myopia.The price ranges from 100 to 500, and it is recommended for customers within 800 degrees.
1.61(1.607) can be called ultra-thin piece, domestic brands retail range from 300 to 600, the thickness is much thinner than the previous two kinds.It is recommended to be within 1000 degrees.
1.67 (1.667) is now known as ultra thin lenses, retail, 600-1000 degrees can be 1500 degrees, 500-600 of myopic friends with this lens, should be a good choice, I for my own use is that the refractive index of the lens, aspherical design, the visual is very comfortable and the price on the high side, the film for the import lens stick a card, a rare domestic), suggest customers to use within 1200 degree.
1.74(1.735) At present, you can buy the thinnest lens, aspheric design, starting from 1000 yuan, are all imported paste domestic brands.The pursuit of thin, beautiful, high quality people use, the highest can do 2000 degrees, it is recommended that people within 1500 degrees.
3.Film layer type
General common lenses are divided into substrate (without film lens, used for dyeing purposes, very low wear resistance), epidural (silicide film, transparent colorless, difficult to distinguish), green membrane (fluoride, increase the transmission of light), purple membrane (metal ion membrane, pervious to light and hf radiation shielding, the film itself has the conductivity and shielding function).As long as it is the lens of color film, light transmittance can reach more than 97%.Add hard film, mainly used in the work environment is poor, their love more bad of the customers to use, the lens is not easy to have Nick, long service life, however, pervious to light only 88%, the lens in easy to reflective light differences in the larger environment (embodied in the user can see from the lens inside the back of the object, take photos when surface reflective).
4. The use of maintenance skills and lens life
The advantage of resin lens is light, not easy to break, the disadvantage is not wear-resistant, we live in a city, full of dust, and the oil secreted by the face, if you do not pay attention to maintenance, as long as half a year will make the lens damage.Correct method is after washing the dust of lens positive and reverse surface with tap water, evenly daub is in lens surface with detergent, then rinse with water, the water that remains on lens is dried with face paper, generally speaking, lens 2 days clean can be.
Does it work without scratches? No.Resin lens processing is high temperature liquid monomer or uv curing, with longer life cycle, the change of environment and temperature, film layer on the surface of the lens and the lens material itself can change the physical, membrane layer under a microscope to see will be uneven, local luminosity and match the material itself is different, lead to the light scattering, comfort, with long time will have the symptoms of dry eyes, distention, this time, you should replace the lens, the time will be about a year and a half to two years.
