How to choose progressive lenses
The progressive lens can effectively control the deepening of myopia, but there is no reliable empirical evidence. At present, the height of the lens frame is only about 30mm. The distance from the design of the transition interval is not enough, and the comfort of the eye is difficult to adjust the short distance. From the quality and technology, the foreign brand design process is stable and mature, but the price is too high, there are still a lot of people who are not easy to adapt. The parameters of progressive lenses need to be determined by strict optometry.
Bifocal vs Varifocal Glasses: What Are Their Differences?
The above part has introduced some basic information about bifocal glasses and varifocal glasses. So, what are their differences?
- Bifocal glasses have two different prescriptions in one lens, while varifocal glasses have three different prescriptions in one lens.
- There is a distinct line between different prescriptions in bifocal glasses. Varifocal glasses allow getting through other prescriptions smoothly.
- Varifocals can give you a vision at any distance.
- Bifocal glasses are more cost-effective than varifocal glasses.
However, they also have some similarities. Both glasses can be used to correct presbyopia vision. So, when you choose glasses, you can decide to choose bifocal glasses or varifocal glasses based on your needs. If you want to get a pair of corrective glasses online, Koalaeye Optical is recommended. It is an online glasses store and provides all kinds of eyeglasses, sunglasses and frames. In addition, these glasses are stylish and come at a cheap price.
Type of eyeglasses cloth
There are many kinds of cloth for glasses. There is mainly sheepskin eyewear cloth, and there is microfiber eyewear cloth. There are suede and double-sided cloth and so on. Professional eyewear cloth must use more than 200 grams of weight/per cubic centimeter of microfiber. This kind of raw material chemical fiber is fine, and tactility is soft, so it will not damage the lens. This kind of wipe cloth can be used on a computer screen. The two sides of the cloth are different, and the smooth side is used to scrub the lenses. Because the dirt on the lens is mostly small. The rough side is designed to give you more friction when you touch it with your finger, so you can use it more easily, and you can clean it more.
Ray-ban clear frames are of high quality.
Ray-ban is one of the world's top ten brands of sunglasses, in addition to anti-UV400 ultraviolet lens, and filter out all kinds of harmful glare, the style of the glasses design highlights the temperament of the military, with the mature style of fashion and nobility. Ray-Ban's frame is the most part of Ray-Ban glasses, with unique design, atmosphere, and fashion, suitable for different situations and loved by many fashion people.
The function of eyeglasses cloth
Under a powerful microscope, the fibers of the cloth are more closely arranged than those of ordinary cloth, and the material itself is softer than ordinary cloth. That's because eyeglasses under the eye are almost always coated, with each standard lens having seven layers of different functions on the front and back surfaces, to extend lens life. It can thoroughly remove the stubborn stains left on the lens to make the picture clear. It can clean all kinds of glass, resin, and other materials of glasses, glass mirrors, and other mirror surfaces, remove stains, and grease absorption.
Does blue light cause damage to the eyes?
Businesses often associate blue light with mobile phones and computers that everyone frequently touches. There are also many terrible explanations about blue light on the Internet, ranging from causing damage to the eyes to causing cancer. Therefore, in recent years, mass media and academic circles have caused heated discussions about the possible impact of blue light on eye health.
It is believed that the reason why blue light harms the eyes is that blue light is not like ultraviolet light which is absorbed by the cornea and lens so that it cannot reach the retina. Blue light can reach the retina through the refractive medium of the eye, and over time it will cause the aging and functional degradation of the retina. But in fact, the eyes have many protection mechanisms in the process of evolution, such as squinting, pupil contraction, lutein contained in the macula of the retina, the anti-oxidant repair mechanism of the retina, etc., which can protect our eyes from the damage of blue light. Also, after scientific testing, the blue light emitted by electronic products is a few percent of the intensity of blue light in natural light, which means that as long as the electronic products are not used continuously every day (for example, more than 8 hours a day), blue light will not be causes obvious damage to the eyes.
Is it necessary to repair the glasses that are badly damaged?
If your glasses are badly damaged, think about getting a new pair. Maintenance is maintenance, not a replacement, so there are some traces of maintenance. The repair cost is far more than or can buy a new pair of glasses, so there is no need to repair them. For the kind of alloy that's used for cheap glasses and the kind of alloy that's used for high-end glasses, the texture of the welding is so different. There are differences in intensity. In order to make the cheap glasses strong after welding, it will definitely increase the welding marks (solder repair, etc.), so the marks will be obvious.