This unique pattern is the perfect choice for those who want to wear tops and jackets of any color. They fit almost any color. Tortoise glasses come in many colors, and this stylish pattern has a wide palette, so there's no need to worry about skin and hair color. If you want to keep up with current eyewear trends, unique-patterned tortoiseshell glasses are your best bet.
Advantages of progressive multifocal lenses
The progressive multi-focal lens has a number of different focal points from top to bottom. There's a smooth transition between seeing far and seeing close. There is no clear dividing line in the middle, like the myopia glasses, quite beautiful, and it is not dangerous. Because the added value is continuously and slowly increased in the gradient area, the wearer can get a continuous clear vision from the far point to the near point through the progressive lenses with the appropriate head position. In line with physiological optics, They help a better adaptation. Since the lens degree changes little by little, there is no phenomenon like jumping. Because the degree of the lens is gradual, so the vision from far to near changes slowly increase, which will not produce the adjustment of the eye fluctuation. It is not easy to cause visual fatigue. Without a degree line, the appearance will be more beautiful. Clear vision can be obtained at all distances within the visual scope. A pair of glasses satisfies both close and middle distances.
How Do Progressive Lenses Work?
How do progressive lenses work? You may have this problem. As is well known, when you are over 40, your vision begins to deteriorate and you may suffer the presbyopia condition. So, with the progressive lenses, you can see at all distances with one pair of glasses. They start with your distance prescription at the top of the lens and increase as you move toward the bottom of the lens.
Then you move your head position to allow you to focus through different areas of the lens. Move your head upwards to see something in the distance, hold it straight for intermediate or arm’s length vision and down for near vision for objects that are close up.
In addition, progressive lenses avoid the visual discontinuity or image-jump when your eyes shift from one zone to the other in non-progressive multifocals since there are no distinct lines in progressive lenses.
There are three processes for resin-changing lenses.
The incorporation method, known as bulk polymerization, is similar to the method of glass lens, that is, one or more photochromic dyes are directly incorporated into the polymer monomer of the substrate for bulk polymerization, and the lens formed after curing will change color. Discoloration dye is completely integrated into the resin lens substrate, so the lens made of color persistence is very good.
The uniformity of discoloration and the depth of color after discoloration are highly related to the thickness of the lens. Because the thickness of the lenses at all levels is different, there will be a color difference between the depth of discoloration and the uniformity, and the uneven phenomenon of high brightness is more obvious.
The film type is known as the coating method. It is the chromatic resin lens by coating or dipping in a layer of chromatic dye on the base of the resin lens. Because the coating covers the surface of the lens, the color uniformity is good. The coating, which is only about 0.05mm thick, does not provide enough molecules to make the lens dark enough, so the color is relatively less dark, and the discoloration lasts slightly longer.
Infiltration, known as the penetration method, is to use the principle of penetration, through the thermal diffusion method to make the color dye permeate the surface of the resin lens sheet material, with diffusion depth up to 0.15~0.20mm. The lens has a constant color change characteristic. There will be no inconsistency between the center and the surrounding color as the luminosity gets darker. The color-changing resin lens made by infiltration type has the benefits of uniform color-changing, small color difference, fast and thorough color-fading, which is the mainstream of color-changing technology at present.
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.
What is a progressive lens?
A progressive lens is a lens whose upper sides are used to see far, and the lower side is used to see near. The distance from the fixed distance power above the lens to the near power fixed below the lens does not change suddenly, but a gradual transition between the two through the gradual change in refractive power.
Standard progressive lenses are multifocal lenses with three observation areas, farsightedness, intermediate vision, and nearsightedness. Unlike bifocals, there are no visible lines between each viewing area. They have a seamless, invisible design, where the optical power changes 'gradually' throughout the lens. Many people confuse 'bifocal' or 'trifocal' with 'progressive' but remember that bifocals and trifocals have visible lines in the lens, while progressive lenses do not. Because progressive lenses have no lines in the lens, they are more popular multifocal lenses than bifocal lenses. However, is progressive lens good for eyes?
What are the functions of anti-blue glasses?
The myopia of young people is getting worse every year, and the main factor that causes myopia in young people is the high-energy blue light of mobile phones and computers. Children’s lenses are clearer and more transparent than adults and have a weaker effect of blocking and filtering the blue light of electronic products. The blue light transmittance of their lenses is several times higher than that of adults so there is more blue light penetrates the lens to reach the retina. Therefore, the damage caused by blue light to children's eyes is much more serious than that of adults. Naturally, be careful with blue light. When the child is facing the screen of the mobile phone and computer, wearing anti-blue glasses can more or less reduce the blue light and reduce the blue light energy. The blue light energy that enters the retina is not so much so strong, and naturally, it will not damage the pigment epithelial cells and photoreceptor cells on the retina, thus protecting the child's eyes.
The main function of anti-blue glasses is to relieve eye fatigue, reduce retinal damage, prevent myopia from deepening, and reduce the incidence of special eye diseases such as macular degeneration and cataracts. According to your own situation, if you are really looking at the phone and computer screen for a long time, wearing anti-blue glasses is better. Usually, pay more attention to the habit of using your eyes, rest your eyes appropriately, and play less with mobile phones and computers.