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Maintenance guide for basketball glasses
The weather is getting better, and sunny days are also very suitable for exercise and fitness. As a popular competitive sport, basketball is becoming more and more popular in this season. Basketball glasses, as a field equipment for myopic basketball enthusiasts, have also begun to be popular in recent days. Good protective gear should also do daily maintenance work. Here are some methods for maintaining basketball glasses.
. When storing basketball glasses, avoid placing them in an overheated place, otherwise it will easily lead to deformation of the glasses and increase the risk of breakage. . 2. Keep the basketball glasses away from sharp objects, and do not store them with hard objects, otherwise the lenses will be easily scratched.
3. Some chemical products are harmful to the glasses, please pay attention when storing them, and do not use special chemicals to wipe the glasses easily.
4. After using the basketball glasses, wipe off sweat and other stains with a soft towel or the like. At the same time, if they are washed with water, they should be stored in the glasses case after they are dry.
5. When you do not use basketball glasses for a long time, you can store them in a box to reduce the risk of scratches and oxidation.
6. It is common for basketball glasses to be transparent and the rubber part to become yellow due to oxidation. In theory, there is no way to change it back to the original color. After oxidation, it will also affect the protective performance. It is recommended to replace it in time. In weekdays, the oxidation process can be slowed down by avoiding light and keeping it dry during storage.
7. The elastic part is also relatively easy to deform, and it is also difficult to completely solve it. The only way to reduce excessive pulling on it is usually.
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Types of protective glasses
There are many types of protective glasses, and their application fields and effects are also different. Corresponding protective glasses are required in mechanical, radioactive, chemical and other environments, and even if they are the same field, because of the different environments, the same category The protective glasses may have many models with different parameters. 1. Anti-arc glasses Such glasses are often protective glasses deployed in industries such as electric welding and steelmaking that are in contact with arc light. It should be noted that most arc-proof glasses have a corresponding barrier range, which can be simply judged from the lens color: the stronger the arc, the darker the lens color needs, and vice versa. If you don’t wear the corresponding glasses, such as wearing light-colored glasses in a place with strong arcs, it is difficult to shield all kinds of arcs. Common arcs such as ultraviolet rays and infrared rays will penetrate the glasses and damage the eyes. Long-term wearing still cannot avoid suffering. Eye diseases such as cataracts. If the energy is strong enough, it may even burn the glasses in an instant and cause blindness 2. Dustproof glasses Such glasses are simple protective glasses, which are mainly used in dusty environments. They are generally used in conjunction with masks and protective masks. The anti-pollen glasses used in the spring when pollen was prevalent are barely included in this list. 3. Anti-impact glasses This type of glasses has high requirements for firmness, and is mainly used to prevent various small particles from flying out from damaging the eyes. Professional impact resistance qualifications are required, and other glasses cannot be replaced at will. Those who are engaged in polishing, turning, and stone industries generally need configuration. 4. Anti-chemical glasses Due to the particularity of the working environment, this type of glasses requires alkali resistance and corrosion resistance. They are very common in the chemical industry. They are mostly used to protect various chemical solutions. In addition to the glasses, the protection requirements for other parts of the body are often higher. . The above is only a list of some of the more common types of protective glasses. Because there are so many industries, all types of industrial environments cannot be generalized. When you choose, you must also base your work environment in detail.
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Features of PC material
PC is polycarbonate. It is a widely used material. It is a thermoplastic material. Because it was often used in the windows of aviation vehicles in its early days, there are also aliases such as "space film" and "cosmic film". The things that can go to heaven are naturally not simple. PCs are firstly harder, and what is more valuable is that in addition to hardness, they have very good toughness. We must understand that for protective products such as basketball glasses, rigidity is far from insufficient. When subjected to impact or impact, only solid materials are easily broken. Refer to glass. The strong toughness of PC lens can make it a material (2CM thickness) used in bulletproof glass, so it is also called safety lens. It can be said that in terms of protective performance, PC and basketball glasses fit quite well. Hardness and flexibility alone are not enough, and weight is also a point that needs to be considered. After all, the wearer of basketball glasses must consider comfort. The PC material has a density of 1.2 g/cm³, which is relatively light and does not put excessive pressure on the face and nose. This weight also ensures that the strap will not be pulled around during exercise, ensuring stability sex. After ensuring solidity, toughness and weight, it is not difficult for us to understand why PC is so popular and widely used in terms of material. And the PC has a feature that it is not expensive, which is also one of the biggest motivations for it to be so popular. A pair of basketball glasses with qualified protective ability may be in their early 100s, which is quite suitable for the student party who loves basketball. PC materials are also very stable, not hypocritical, easy to clean, not easy to deform, and will not react with thermal expansion and contraction due to changes in the weather. Transparent materials will not turn yellow or color for at least one or two years. There is no need to worry about deformation when washing with hot water, and it is also non-toxic. Such a strong and toss-resistant material is quite suitable for making basketball glasses. After using it, just rinse it with water and dry it, saving time and effort.
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Lens classification of laser protective glasses
The lenses of laser protective glasses are generally divided into reflective and absorbing lenses, and there is a big direct difference between the two. The reflective type mainly uses coated sheets, while the absorptive type mainly uses glass sheets and polycarbonate sheets.
Reflective types generally use coated sheets. The coated sheet is generally applied to the lens by applying a specific thin film coating, so that a specific wavelength will bounce in different directions after contacting the lens, reflecting in a broad scattering mode. The price of this kind of lens is low, but once the coating is damaged, the light will pass through the lens and directly damage our eyes. Therefore, laser protective glasses with this kind of lens are generally not recommended. To Absorbing laser protective glasses are generally equipped with glass-absorbing and polycarbonate-absorbing lenses. The visible light transmittance of glass-absorbing lenses tends to be high and the visibility is good. At the same time, it can absorb more heat density and make it have good thermal stability, so it can provide a higher level of safety protection. Generally, the greater the thickness, the stronger the protection ability. However, laser protective glasses equipped with this type of lens will be heavier, less comfortable to wear, and more expensive. To Relatively speaking, polycarbonate absorptive lenses are much more affordable, and they are currently the most widely used laser protective glasses lenses. Compared with glass lens, it is lighter and has poor impact resistance unlike glass lens. Its current process is to select absorbing laser fuel, and with the continuous development and iteration of technology, it can provide protective glasses that absorb multiple wavelengths at the same time, which greatly improves the visual effect while ensuring the visual effect.
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The purchase of protective glasses
1. The primary factor of protective glasses is the relevant qualifications. When purchasing, ensure that the products meet the qualification requirements of the current industry. It is best to choose products produced by manufacturers with a long history and sufficient experience. 2. Purchasing the one that fits your face shape is not only about wearing comfort, it is also a hard requirement in some industries to have sufficient airtightness. For example, during this epidemic, the protective glasses worn by medical staff generally need to be completely sealed, otherwise they will not be able to effectively protect against the virus. Some protective glasses can choose glasses with nose pads and temple adjustment functions, which can better fit your face shape and will be more firm and comfortable to wear. 3. It is not that low-priced glasses are not good, but some protective glasses themselves can be said to be customized for the industry and individuals, so the price tends to be relatively high. For example, the price of welded glasses is generally not low, because there are strict requirements from style to lens, and the optical technology is often difficult to make. 4. Related industries will have demand for glasses materials, such as those that require anti-impact performance glasses, generally do not choose resin glasses as the lens material. At present, PC lenses are more mainstream.
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Material characteristics of welding glasses
1. The material for welding glasses should have elasticity, corresponding strength, and proper rigidity. In short, it must be able to bend properly and not break easily. 2. The material should not damage the skin and should not be a flammable material, because there will be fire spattering during electric welding. Nowadays, PC materials are more common in the market. 3. The head part of the eye mask is best to be soft, and the higher the fit to the face, the better to avoid sparks. The lens part is selected according to the intensity of the welding current. The dark-colored lens has a strong filter performance and is more suitable for high-current welding operations. Therefore, the darker the color of the lens is naturally the better if the molten pool can be seen clearly.
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Guide to buying glasses
Glasses, no accident is a problem that every myopic patient needs a lifetime headache. In today's era of enthusiastic pursuit of appearance, glasses are not just a "necessity", but also often take on the role of "accessories". Many young myopic people are pursuing the appearance of glasses. When choosing glasses, it is often easy to pay extra for their additional functions. These extra costs are not terrible, but the terrible thing is that the money is spent but it hurts the eyes. Large, thin-frame glasses have been popular among the public in recent years because of their simple and neat shape, but for patients with high myopia, this type of glasses frame needs to be carefully selected. From the aesthetic point of view, the large thin-frame glasses will make the thick and high myopia lenses thicker. As a result, the eyes will appear smaller when looking through the glasses, and the overall shape of the glasses will also look strange.
In terms of the wearing experience, a thin frame with heavy lenses can easily cause the glasses to deform and increase the wearing burden. In addition to the glasses will often fall, it is also easy to crush the face or leave marks. Of course, these problems are nothing if compared with the following problems. First of all, we need to understand the concept of interpupillary distance. The so-called interpupillary distance refers to the distance between the centers of the pupils of the two eyes when the eyes are looking squarely or parallel.
The value of the interpupillary distance has a great influence on the polishing of the lens. The optical center of the lens must be aligned with the pupil center of the two eyes, which can ensure that the glasses are clearly seen without distortion and reduce visual fatigue. If there is a large deviation between the optical center of the lens and the pupil centers of the two eyes, the difference in the distance between the two centers will cause the position of the focus on the retina to change, which will cause the focus that should have fallen on the retina correctly to shift, resulting in There is a deviation of vision, which is the prism effect. In the long run, it will not only deepen visual fatigue, but also increase myopia problems. The deviation between the optical center point and the pupil of the large-frame glasses will be larger. In fact, this problem often occurs because of the large and heavy. The optical center point tends to be relatively small, which is why our spectacle lenses are often thin in the middle and thick around the periphery. Larger lenses will cause the optical center point of the large-rim glasses to be higher, and the lower half will be thicker. The lenses are heavier.
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Features of ski goggles
If you want to go to places with snow, you need to configure more professional goggles, that is, ski goggles. Although talking about snow in summer is a bit weird, it can't hold back everyone's desire to climb higher to escape the heat, so here is the second type of goggles needed to climb plateaus and snowy mountains. The reflectivity of snow to sunlight can reach up to 97%, which is not low under normal conditions. On a sunny day, enjoying snow may be able to reap beautiful scenery, but it is more likely to reap snow blindness. When snow blindness occurs, the eyelids will be red and swollen, the conjunctiva will be congested and swollen, and it will also bring strong pain and foreign body sensation. It will become photophobic, keep tearing, blurred or distorted vision, and even temporarily lose sight in severe cases. Therefore, goggles dedicated to skiing are very necessary, which can not only effectively resist snow reflections, but also prevent wind and snow from entering the eyes, ensuring clear vision.
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The difference between medical and ordinary goggles
Medical goggles are one of the most important protective equipment during the epidemic, and they have a very good effect in preventing new coronary conjunctival infection. However, because there is no distinction between them in the past, everyone really realized the difference between medical goggles and ordinary goggles during the epidemic.
So what is the difference between medical goggles and ordinary goggles? First of all, medical goggles are one type of goggles, but because the broad category of goggles is suitable for "protection", the scope of application of various types is different, and generally speaking, they cannot be mixed. Medical goggles are generally used in hospitals, clinics, and areas that need to prevent eye and conjunctival infections. They are mainly used to prevent the splashing and splashing of saliva, blood and other body fluids, and to prevent eye infections, so they are very common in epidemic prevention and control. The specifications of medical goggles are generally fixed, generally in the following styles:
Compared with ordinary goggles, this special specification will have a larger internal space, so myopia glasses can also be accommodated inside to ensure that medical staff wearing glasses can use them normally. The difference in appearance of medical goggles is generally the difference in color, vents, and strap material, which are generally the style of lens + large frame + strap. Although the internal space is relatively large, medical goggles attach great importance to sealing, so they are relatively more protective. At the same time, according to the use environment, medical goggles require stronger anti-fog performance. You can often see news like "water in the goggles" in the news before. This is because in a closed environment, water vapor cannot escape from the goggles. It accumulates more and more in the internal space, forming fog and water droplets. Medical staff are generally not allowed to take off their goggles at will during the inspection and anti-epidemic process, so the problem of fogging is more serious. At present, there is no special national and industry standard for medical goggles. Therefore, when purchasing, we must pay attention to the quality of the product and the professionalism of the manufacturer to prevent the purchase of fake and inferior products.
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Precautions for wearing children's glasses
First of all, whether it is the first time to wear glasses or to change glasses, it is recommended to choose a formal optometry institution for optometry. Adolescents under the age of 18 also need to have mydriasis optometry to determine whether it is true myopia or false myopia. Myopia is generally divided into false myopia, true myopia, and mixed myopia. Pseudo-myopia is mainly caused by the continuous contraction and spasm of the ciliary muscle due to excessive use of the eye, and the thickness of the lens increases. Like true myopia, it is manifested by decreased distance vision and good near vision. Generally, it will decline and recover within a week to 1 to 2 months. However, if it is not relieved in time, it will develop into true myopia, which is permanent myopia. Mydriatic refraction is mainly used to distinguish between true and false myopia. In professional terms, mydriatic refraction relaxes the ciliary muscles of the eye and removes false myopia components by using a ciliary muscle paralysis agent. The diopter obtained in this state is the most true and accurate. Because ciliary muscle paralysis agents are generally prescription drugs, this kind of optometry can only be done in hospitals. Optical shops can only do obvious optometry, and the data obtained is not necessarily accurate. Glasses made with inaccurate data often fail to obtain effective vision correction, which can lead to increased eye fatigue and even loss of vision. It should be noted that after mydriasis optometry, the pupils will dilate and the light entering the eyes will increase. In addition, the optometry lasts longer. At this time, more attention should be paid to the protection of children’s eyes.
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