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Choice of optical lenses
Optical lenses can be divided into two major categories, namely, glass lenses and optical resin lenses.
Glass lenses, including lenses and optical glass lens with high refractive index (that is commonly referred to as ultra-thin films), its high hardness, wear resistance, and the general quality and the parameters would not change over time, but the impact resistance of glass lenses and slightly less than the weight of resin lenses.
Resin lenses generally much lighter than glass lenses, and the shock resistance is superior to glass, but its relatively low surface hardness, it was relatively easy to be abrasions. Resin lens and lens coating properties due to its soft, so care should be taken not to allow normal mirror direct contact with a hard object, when a good idea to scrub with water (or mix a small amount of detergent) to clean, and then try to use a dedicated high-quality cloth or dry paper glasses of water droplets on-chip. In addition, poor environmental conditions in places coated lenses should be used with caution so as not to wash it difficult to clean dirt.
The type of glasses lenses
Roughly divided into the types of lenses: Anti-reflective protective lenses, color lenses, color coated lenses, polarized lenses and five color lenses.
1. Anti-reflective protective lens: This lens is on the surface coated with a thin layer of magnesium fluoride to prevent light reflection, so that you can see things more clearly and interference from bright light. To detect whether your glasses protective anti-reflective lenses, glasses at the light source can be, if you can see a purple-green reflection, it said that there is a genuine lens anti-reflection coating of the protective film.
2. Color lenses: also called "stained lens", that is, in the lens production process, together with a number of chemical substances, so that a color lens to absorb specific wavelengths of light. This is the most commonly used in sunglasses lens types.
3. Coloring lenses: the effect of such lenses with a lens the same color, only made in different ways, it is to be applied to the lens surface color, the most well-known is the "Gradient lenses coloring style," color is above the deepest, and then down shallow gradually. There are degrees of sunglasses is more than coloring approach to the lens.
4. Polarizing lenses: In order to filter the sun shone on the water, land or snow on the direction of the dazzling light of equality, in the lens perpendicular to add to the special coating, called a polarizer on the lens. Most suitable for outdoor sports (such as: marine activities, skiing or fishing) use.
5. Discoloration lenses: It was also referred to as "photosensitive lenses." Because the lenses are incorporated into the silver halide chemical substances, so that was colorless and transparent lens, the event of such lights, it will become a colored lens, as protection, it is suitable for indoor and outdoor use.
Wearing glasses was a symbol of wisdom and culture. As a result of modern society, television, computers and other inventions brought about by the potential threat of eye protection, wear glasses more and more people.
Glasses to protect children is to ensure that the use of glasses of high light transmission rate when the fundamental measures. How can we protect children in their glasses? First, the glasses should be stored properly, temporarily removed does not wear glasses, do not allow direct contact lens desktop, but also in the frame of spectacles is to recover arms, feet arm down, the lens up position. If you go to bed at night, glasses box Add to glasses to prevent the lens wear and tear, crush, break, glasses box must not be too soft, or long-term squeeze, allows the foot arm (mirror legs) deformation, wear a certain ramp up affect the degree of visual acuity. Second, the attention to films to prevent rubbing and wear glasses, lenses, there may be dust or dirt flannel or graze, it should not make clothes, fingers, or anything clean, as it would wear lenses, reduced transparency, long - this continues, it will be like a lens with a layer of opaque mist, like shelter, if the lenses have oil or other dirty things, to Kazakhstan in one breath so that wet dirt mirror arrangements will be followed by gently wiping cloth, it can not be engraved hardware, or something with a hard blow.
Children to do sports or other intense activities, it is necessary to remove glasses, spectacles Add box.
Eyeglasses for children, if damaged, or glasses can not achieve normal vision correction, we should in time to the hospital for examination, refraction, re-wear the right glasses, in order to protect the eyes of children.
Children with glasses frames to fit the size of why?
Children wearing glasses, the main role of the eye to treat, but also the objective of beauty play a role.
The right frame size is directly related to the improvement of children's visual acuity, visual development.
In accordance with lively children, the characteristics of active, multi-use of plastic frames, or made of plexiglass. This frame slot wide margin, the installation of a solid lens, soft, child wear comfortable, but also not easy to damage, less indirect ocular trauma children. Moreover, it is cheap and is popular frame.
The size of frame to fit, and some parents and children that has more good-looking frame, but also that a small number of frames is not easy out, these are not comprehensive. Because the location of children's eyes the pupil is the central piece of the glasses (optical centers), and the surface of the lens and the eye remained at the position 12 mm in order to play a good corrective, therapeutic effect. If the frame is too large, children's eyes away from the optical center is bound to tend to the inside of glasses, the role of emerging prism, resulting in binocular vision in children were unclear, decreased vision, eye pain acetify, headache and other symptoms as fatigue, increase the flexor the development of light is not correct, if the frame is too small, will tend to the lateral eyes, the same away from the lens optical center, as a result of a long time on both sides of intraocular lens pressed leg bone, temporal face also affects the normal development, so frames of children in accordance with the child head, face and eye orbit selected for the development of situation in their own frames, and with the timely replacement of continuous development.
The seventies of the last century has been the development of the computer belonging to an objective optometry optometry law, optometry for this machine is the optical, electronic, mechanical combination of the three instruments, the principles of law and the retina is basically the same as seizure video. In addition the use of infrared red light and fog, as the device automatically to achieve the purpose of adjusting the eye to relax. Its operation is simple, fast, optometry technology is a big step forward. However, various types of computer Refractometers have some error is inevitable, although the use of infrared light and fog, as the device automatically adjust to relax, but you can not completely eliminate the regulation, especially regulation of our young people a strong, simple to use computers often do not accurately optometry. If the law needed to introduce a computer optometry, optometry eyedrops should be used before the ciliary muscle after anesthesia. Optometry computer error results is the existence of high myopia, astigmatism axis bit worse. Optometry, therefore the results of a computer for clinical reference only, not directly as prescription glasses.
After the glasses should always wear at the same time suffering from myopia myopia has been diagnosed with polycythemia, degrees in more than 100 degrees, they should wear the appropriate lens to correct myopia. Once with the glasses, in addition to face and should be wearing it to sleep outside, because patients with myopia to wear glasses with the appropriate, in the eyes of the state to face up to regulate the influx and rehabilitation of natural relations. Wear not only to enhance the vision, but also at an appropriate distance from studying and working, so that the eyes influx regulation and normal function of the coordination of inter-relations, to avoid eyestrain.
The correct degree of wear may be slow to develop or enhance the degree of myopia and not directly related to wearing glasses. Patients with myopia to wear glasses with the appropriate attention with eye health, myopia will stabilize at a certain level. But if that fine with the glasses on, usually pay no attention to use of eye health, continue to eye fatigue in long-term, they may still lead to vision loss, to enhance the degree of myopia. In addition, inappropriate wear eye glasses will increase the burden, so that vision, the degree of understanding. Some high myopia (more than 600 degrees) who, although adhering to wear, but the degree will be deepened, with fundus changes, medically known as pathological myopia. This myopia and the degree of myopia and family-related, has nothing to do with wearing glasses.
Currently used by the lens material is divided into:
1. Glass lenses: the refractive index of stability, good wear resistance, optical properties of stability, but it is rather heavy, easily broken.
2. Resin lenses (CR-39): light, security, transmission rate, not easy to break down, but easy to draw the surface wear.
3.PC lenses: the refractive index of high, solid, but easy to wear.
Resin film hardness as a result of smaller, easy to wear, such as improper use of lenses to change paste, use should be particularly careful, no hard objects (including flannel) scrub, should be placed up mirror, wash with detergent After water washing, and finally dry with paper towels water.
Coating the surface of the lens is the lens increases in multi-layered antireflection coating to reduce the specular reflection, increasing light transmission rate, to ensure visual clarity, increase the sense of beauty, and to reduce the red, ultra-violet damage to the eyes.
Glasses for children, the general choice of resin lenses (light, safe, easily broken), but easy to scratch the surface, it is best to use the resin lenses plus subdural. Frame the election, the general face of the child's choice, security, light, durable frame (sheet-type frame generally high) and should be linked to ear length, in order to increase the stability of frames, the general child active, so all with chains, hung on the neck.
Bifocals, the main chip can see far, and the following sub-part film and video close, but from the appearance of two-light microscope more ridiculous, as far as the near field zone and clear the "beating" phenomenon, or a gradual change with a mirror, can be from the far distance to nearly all the objects are clear, consistent vision, and the unique light of the "optical jump" phenomenon.
photochronic lenses is added to silver halide in the material, under the light stimulus for the silver and halogen decomposition, so that colored glass, light weakening after into silver halide, color shallow. The process is reversible.
Sunglasses of choice in addition to reducing the amount of light in order to achieve the purpose of sun and beautiful, the most important is to prevent ultraviolet light. Long-term over-exposure to UV light may result in conjunctiva, cornea and retina damage, eye disease common UV are: pterygium, recurrence of keratitis, cataract, retinal degeneration.
People long ago discovered the production of glass is not the best lens material. Because the heavy weight of the glass itself, and easily broken by the impact of the debris into dangerous. As early as 100 years ago, it was found that the wear resistance of crystal and a very strong impact resistance and thus making the use of crystal lenses. Because of their very expensive price, can accept, not many people, so often passed on to the next generation. As a result has not yet found a more suitable lens is widely used in the production of new materials, crystal piece in the 20th century, the use of very common age 20-30. During World War II, a number of aircraft used in the manufacture of the cockpit window of the organic material (such as PMMA. Or plexiglass), which have superior optical properties, light weight and easily broken security, by the U.S. manufacturers to produce more secure and comfortable to wear lenses. However, due to the aging of these lenses easily discolored, bad and easy to wear, resulting in high production costs are forced to stop production. In view of this material was the excellent optical properties, optical experts firmly believe that it will come in handy, and later the production of CL will eventually become the standard material, until the emergence of the soft and hard for a mirror, this material was replaced.
In 30-40 years, plastic lenses were made among the laminated glass to prevent glass in fragmented into dangerous impact of the debris, which was mainly used for the production of children's glasses. CR39 in the 40's from Pittsburgh (Pihsburg) Flat Glass Division's chemical found in Colombia. They find more suitable in the development of the production of plastic optical materials, it was found that this experimental polymer (CR-39) has the best balance of performance. Colombia resin because of its No. 39, hence the name. Abrasion resistance of this material is the ability of other known plastic materials 33 times, the first aircraft used for the production of the glass cockpit in order to reduce aircraft weight, and later were classified as military supplies, do not allow other uses. By RobertGraham Dr to further improve its optical properties, and after World War II for the production of optical products. CR39 system in 1947, the use of materials is basically the problems encountered can be settled.
PC lenses carbonate crystals by polymerization, of a thermoplastic material, which has excellent comprehensive properties: impact resistance, high strength, light weight, thin lenses, excellent visual quality, anti-reflective, anti-radiation. It can be seen from the performance, safety, practicality, comfort, environmental protection point of view, PC lens, will become the dominant lens 21.
Abbreviation for the PC is a colorless, transparent thermoplastic material non-qualitative. Its name comes from its in-house group of CO3.
Polycarbonate UV impatience, intolerance alkali.
Colorless, transparent polycarbonate, heat resistance, impact resistance, flame retardant, in the ordinary use of the temperature inside the mechanical properties are good. Nearly the same performance compared to polymethyl methacrylate, polycarbonate good impact resistance, high refractive index, processing performance, with no need for additives to UL94 V-0 flame-retardant performance level.
Pc lens than the traditional strong impact resistant resin film 30 times, 60 times strong than glass, is the world's most impact resistant lenses, the material commonly known as bullet-proof glass after thickening.
Whether glass or resin film, the materials are brittle materials. Therefore, in drilling and wire drawing were easily broken glasses. And for the viscous material pc material, toughness, and not easily broken. Therefore, the use of materials from this lens is ideal for pc drilling and wire drawing in the use of frames.
Its high temperature, ultra-light, super-impact force.
Generally speaking sunglasses are the most common optical plastic lenses. If it is to bring your own sunglasses, the best option polarizer. More comfortable to wear.
PC refers to Polycarbonate (PC) is an acronym for Engineering Plastics, polycarbonate colorless, transparent, heat resistance, impact resistance, flame retardant, in the ordinary use of the temperature inside the mechanical properties are good. Its good impact resistance, high refractive index, processing performance and the application of common day-to-day CDs, eyeglasses.
Eyeglasses in accordance with its material, structure and purpose to classify.
By the material can be divided into: glass lenses, resin lenses, rock crystal lenses, PC mirror;
By end-use can be divided into: corrected visual acuity with lenses myopia, hyperopia, astigmatism, farsightedness, prism lenses tinted goggles film, polarized lenses, UV lens, such as UV absorption;
Frames in accordance with its material can be divided into metals, non-metallic and natural materials, such as the three major categories;
Frames according to their style can be divided into full-frame, semi-box and three types of borders;
At present, the metal material used to frame are copper alloy, nickel alloy, titanium and precious metals three categories;
Frame used in the production of non-metallic materials used for the raw materials of synthetic resin.
Frames for the production of natural materials with special wood, animal horns and hawksbill materials.
Can be divided into two types of contact lenses, a contact lens for the cornea and sclera to cover the entire cornea and sclera around part, because of complications, and is now rarely used. Another for the contact lens is widely used in ametropia correction. Contact lens size and shirt buttons similar to a thin, fully transparent. According to the different lens materials, contact lens can be divided into hard and soft contact lens two. The former is dominated by the MMA made of plexiglass, quality hardware, not easy to deformation, for correction of high astigmatism and keratoconus, but poor ventilation, can not penetrate oxygen, carbon dioxide, water and metabolic substances, wear it not very comfortable. Soft contact lens is based on HEMA or silicone rubber material, soft, good air permeability, and can absorb moisture, with a soft and comfortable to wear, can be used for the treatment of corneal disease, but easy to change the shape, does not apply to astigmatism eyes.