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1.59 PC Bifocal Invisible Photochromic Gray HMC Optical lenses
At present, there are two kinds of lens materials on the market, one is glass material, the other is resin material. Resin materials are divided into CR-39 and polycarbonate (PC material).
Bifocal lenses or bifocal lenses are lenses that contain two correction areas at the same time and are mainly used to correct presbyopia. The far area corrected by the bifocal lens is called the far area, and the near area is called the near area and the reading area. Usually, the distal region is large, so it is also called the main film, and the proximal region is small, so it is called the sub-film.
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1.56 Semi Finished photo grey Optical Lenses
The glass lens of the color-changing lens contains a certain amount of silver chloride, sensitizer and copper. Under the condition of short wave light, it can be decomposed into silver atoms and chlorine atoms. Chlorine atoms are colorless and silver atoms are colored. The concentration of silver atoms can form a colloidal state, which is what we see as lens discoloration. The stronger the sunlight, the more silver atoms are separated, the darker the lens will be. The weaker the sunlight, the fewer silver atoms are separated, the lighter the lens will be. There e is no direct sunlight in the room, so the lenses become colorless.
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1.56 Semi Finished Blue cut Progressive photo grey Optical Lenses
Resin is a chemical substance with a phenolic structure. Resin lens is light weight, high temperature resistance, impact resistance is not easy to break, broken also has no edges and corners, safe, can effectively block ultraviolet rays, resin lens is also a favorite kind of eyeglasses for myopia people at present.
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1.56 Semi Finished Progressive photo grey Optical Lenses
Lens refractive index is higher, the thinner lenses, the greater the density, hardness and better, on the contrary, the lower the refractive index, the thicker the lens, the smaller the density, hardness is also poor, general glass of high hardness, so the refractive index is generally at about 1.7, and resin film hardness is poorer, the refractive index is relatively low, resin piece on market at present is the most common refractive index of 1.499 or so, Slightly better is the ultra-thin version, which has a refractive index of around 1.56 and is also used the most.
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1.56 Semi Finished Blue Cut Porgressive optical lenses
Multifocal glasses have short channels and long channels. The choice of channel is important. Generally, we first consider choosing the short channel, because the short channel will have a larger field of view, which is in line with the lifestyle of people who often look at their mobile phones. The difference between the eyes is relatively large, the eyes of the low rotation ability of the people, is also suitable for short channels. If the consumer is wearing multi-focus for the first time, has medium distance demand, and the Add is relatively high, then the long channel can be considered.
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1.56 Semi Finished Blue Cut Bifocal Photo grey optical lenses
Under the sunlight, the color of the lens becomes darker and the light transmittance decreases when it is irradiated by ultraviolet and short-wave visible light. In the indoor or dark lens light transmittance increases, fade back to bright. The photochromism of lenses is automatic and reversible. Color-changing glasses can adjust the transmittance through the lens color change, so that the human eye can adapt to the changes of environmental light, reduce visual fatigue, and protect the eyes.
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1.56 Semi Finished Bifocal Photo grey optical lenses
In general, color-changing myopia glasses can not only bring convenience and beauty but also can effectively resist ultraviolet and glare, can protect the eyes, the reason for color change is that when the lens is made, it is mixed with light-sensitive substances, such as silver chloride, silver halide (collectively known as silver halide), and a small amount of copper oxide catalyst. Whenever the silver halide is illuminated by strong light, the light will decompose and become many black silver particles evenly distributed in the lens. Therefore, the lens will appear dim and block the passage of light. At this time, the lens will become colored, which can well prevent the light to achieve the purpose of protecting the eyes.
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1.56 Semi Finished Blue Cut Bifocal optical lenses
Bifocal lenses or bifocal lenses are lenses that contain two correction areas at the same time and are mainly used to correct presbyopia. The far area corrected by the bifocal lens is called the far area, and the near area is called the near area and the reading area. Usually, the distal region is large, so it is also called the main film, and the proximal region is small, so it is called the sub-film.
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1.56 Semi Finished Blue cut photo grey Optical Lenses
Color-changing lenses darken when the sun shines. When the lighting fades, it becomes bright again. This is possible because the silver halide crystals are at work.
Under normal conditions, it keeps lenses perfectly transparent. When exposed to sunlight, the silver in the crystal is separated, and the free silver forms small aggregates inside the lens. These small silver aggregates are irregular, interlocking clumps that cannot transmit light but absorb it, darkening the lens as a result. When the light is low, the crystal reforms and the lens returns to its bright state.
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1.56 Semi Finished Single Vision Optical Lenses
The lenses of semi-finished glasses are used to wait for processing. Different frames come with different lenses, which need to be polished and adjusted before they fit into the frame.
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1.59 Blue Cut PC Progressive Photochromic Gray HMC Optical lenses
The so-called functional lens refers to special glasses that can bring certain favorable characteristics to the eyes of specific people in specific environments and stages, and can change the visual feeling and make the line of sight more comfortable, clear and soft.
Color-changing lenses: the pursuit of fashion sense, suitable for myopia, hyperopia, astigmatism, and want to wear sunglasses at the same time. Hanchuang full-color lenses change color quickly indoors and outdoors, resist UV and blue light, simply not too cool!
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1.56 Blue cut Progressive Photochromic Gray HMC Optical lenses
Progressive multifocal glasses were invented 61 years ago. Multifocal glasses solved the problem that middle-aged and elderly people need different luminosity to see objects at different distances and need to change glasses frequently. A pair of glasses can see far, fancy, also can see close. The matching of multifocal glasses is a systematic project, which requires much more technology than the matching of monocal glasses. Optometrists not only need to understand optometry, but also need to understand products, processing, adjustment of mirror frame, measurement of face bend, forward Angle, eye distance, pupil distance, pupil height, calculation of center shift, after-sales service, deep understanding of multi-focus principles, advantages and disadvantages, and so on. Only a comprehensive expert can comprehensively consider for customers, in order to match the right multi-focal glasses.
