On March 7, Shi Weiyun, deputy to the National People’s Congress and president of Shandong Eye Hospital, said in an interview that when wearing contact lenses, people’s corneas are at risk of infection. Once the infection is irreversible, he especially emphasized that it is not recommended for young people. Wear cosmetic lenses.
The representative is engaged in keratopathy, and the way of looking at the problem naturally fits his professional perspective. The statement is correct, but I personally think that the conditions should be added: the young people here refer to: the young people who are the best corrective methods of frame glasses and contact lenses; it is not recommended to wear them: not as the main corrective method ( Cannot be worn often), should not be purchased and worn by yourself; cosmetic contact lenses refer to: inferior cosmetic contact lenses (including inferior transparent lenses); in the context of the domestic contact lens market. For groups with anisometropia, the visual quality of contact lenses and binocular vision are beyond the framework of the framework, so I won’t go into details here. Contact lenses are three types of medical devices, which are of the same level as heart stents. Wearing contact lenses is also a medical behavior, and any medical behavior must be risky. If frames and contact lenses are also suitable for you, why should you wear contact lenses from a risk and health point of view? From the perspective of vision correction, there is a low risk and a zero risk for corneal infection. Low risk does not mean that there is no risk. The security of the framework is obviously much higher than invisible. It is a low-risk medical behavior to inspect qualified products in a qualified organization, and the wearing of contact lenses (including cosmetic lenses) under regular supervision is a low-risk medical behavior, but if the product and the person (wearer, fitter, consumer ) If one party is unqualified, the risk of wearing is greatly increased, and it is no longer safe. Our cornea is in direct contact with the air (there is actually a tear film in front), and a large amount of oxygen is obtained from the air to maintain the normal function of the cornea. This is the main way for the cornea to obtain oxygen during the day. Wearing contact lenses is equivalent to covering the cornea with a quilt, and the cornea will receive less oxygen. For example, the neovascularization in the video is caused by the lack of oxygen in the cornea. If contact lenses are used as the main way of wearing, 7 days a week, 10 hours a day, the cornea is covered with a layer of quilt, the eyes will surely have problems over time. Compared with ordinary transparent film, the oxygen permeability of cosmetic contact lenses is generally lower. This is a basic fact in the current domestic market (there are very few silicone hydrogel lenses). There are almost all major silicon hydrogel manufacturers for transparent sheets, and it is not a new technology. However, the silicone hydrogel technology of cosmetic contact lenses is currently available. Johnson and Johnson, the originator of cosmetic contact lenses, still sells hydrogel cosmetic contact lenses. Some people who know that make a mess of their own silicone hydrogel cosmetic contact lenses every day, just listen to her blowing NB, don’t take it seriously. The representative said that the domestic market background is also blessed, and the market is chaotic. There is a lack of standardized fitting institutions, and there is no strict supervision system. Even many of the products sold by WeChat and Hitomi are not qualified. It is not an exaggeration to say that it is not recommended to wear them. Moreover, the wearing safety of cosmetic contact lenses is much lower than that of transparent films. If you must wear contact lenses, some potential risks must be reduced to a relatively low range, and it is not forbidden to wear them. Can you wear it? Contact lenses have strict contraindications, and many people cannot wear them. “Monocular people” ban the monocular here in a relative sense. For example, one eye has amblyopia caused by strabismus, congenital cataract, ptosis, etc., or the corrected vision of one eye is very poor (strabismus, nystagmus, etc.) Not recommended to wear). Because there is only one eye with good vision, daily work and study mainly rely on one eye. There is a risk when wearing contact lenses, the risk of infection. Although this probability is very small, there is no guarantee that it will not happen, no matter how small it is. What if a small probability event occurs because the infection causes the vision of the other eye to decrease, what should I do at this time? This time will be catastrophic. Diabetes, thyroid diseases, hypertension, rheumatoid arthritis, etc. are prohibited for systemic diseases. For example, diabetic patients have decreased corneal perception and decreased eye infection resistance, which increases the chance of eye infections. Endocrine changes in thyroid disease, there is also the risk of incomplete blinking and corneal exposure. Some people in this group of people take drugs that affect the secretion of tears and affect the wearing of contact lenses. Women who are pregnant, menopausal, allergic, and mentally ill are disabled for pregnancy and menopausal women. Because of the special period, the changes in the body’s endocrine not only affect the safety of wearing, but the accuracy of the diopter is also not very high. The material itself, the ingredients of the care solution, and the daily wear and removal of glasses are all detrimental to people with allergies. When you have a cold, if you have rhinitis, your body’s function and resistance will decrease when you disable the cold. Wearing it at this time will increase the risk of infection. At the same time, some cold medicines can affect the secretion of tears. People with rhinitis wearing contact lenses also increase the risk of eye infections. Prohibition of special working environment, such as heavy sandstorm, dirty working environment, oily smoke, smog, etc. When you are not wearing glasses, in these working environments, due to the self-protection mechanism of the eyes, such as blinking, tear exchange, etc., particles in these environments will be washed out of the eyes. Because of wearing contact lenses, these particles will adhere to the lens or around the eyes, and the risk of microbial infection in these particles cannot be ruled out. Certain ocular diseases: patients with dry eye; repeated inflammation of the eyes; lacrimal disease; abnormally sensitive or insensitive eyes. It is forbidden for children in the growth and development period and those with poor hygiene compliance. If there are no such taboos, you also need to know the parameters of wearing contact lenses. The parameter base arc of the eye: This base arc (BC) is the radius of curvature of the front surface of our cornea, which is different for each person. Just like how big we wear to buy shoes, we must first fit the size. The code is inappropriate, which affects the wearing effect and the health of the eyes. Both the keratometer and corneal topography can measure the base arc, and the current computer refractometer can also. Since our cornea is not strictly a spherical surface, the horizontal and vertical curvatures are slightly different, but the general soft lens is spherical. The horizontal and vertical are the same curvatures (the curvature of 360 degrees is the same), and the base arc needs to be converted. If the base curve of the lens is larger than the curvature of the cornea, the lens will be loose, clear when blinking, blurry after blinking, and even a slippery lens will appear, and the lens will fall out of the eye. If the base curvature of the lens is smaller than the curvature of the cornea, it is like putting a rubber band on the cornea to tighten the cornea. It will cause blur when blinking and clear after blinking. Over time, it may even cause corneal hypoxia and some ocular reactive symptoms, such as red jelly and eye pain. Diameter: Let’s take the example of buying shoes. Shoes that fit the size and do not follow the foot are often not the same thing. For example, shoes with shoelaces, if the shoelaces are the right size, they won’t follow the foot. . This diameter, like the base arc, also determines the suitability of wearing. The diameter and base curve together determine the fit of the contact lens. The diameter is judged comprehensively based on the diameter of our cornea and the degree of movement and coverage of the lens. The base arc may be adjusted up and down without changing the diameter, or the base arc may be adjusted up and down without changing the diameter. In the end, satisfactory fit and comfort can be achieved. Just like with glasses, you need to know your degree and visual function. The change in visual function brought by contact lenses during actual use of the eye. If the visual function is impaired and cannot adapt, it is not recommended to wear contact lenses until the relevant visual function is restored. Most people know the degree relatively well, so I don’t want to introduce too much, I just want to talk about astigmatism. Why would people with astigmatism be affected when they wear contact lenses? Because the contact lenses on the market have only spherical components for myopia and hyperopia, and no cylindrical components for astigmatism. We can choose a spherical lens to compensate for the amount of astigmatism, but the clarity is affected. On the market, you can also customize soft lenses with astigmatism, but astigmatism, like a vector in physics, has not only degrees but also directions. The axial direction of the lens is easy to be skewed when worn on the eye. Although there are many ways to stabilize the axial direction, each has its shortcomings, and the actual effect is generally not ideal. How to choose products? In a word: high oxygen permeability, short cycle. The higher the oxygen permeability, the thinner the quilt and the lower the potential impact on the cornea. There are traditional and discarded contact lens wear types, as well as the period derived between the two. The traditional type is discarded annually, and the discarded type is discarded daily. The products in the middle (half-yearly, quarterly, monthly, bi-weekly) are strictly not called discarded, discarded, discarded when used up, from the perspective of definition and safety, only daily discarded is the true discarded type. Let’s take a look at the risk posed by contact lenses: the safety risks posed by the product itself and the safety risks that exist in the process of wearing it. For example, the potential risk of microbial infections during picking and wearing, as well as microbial infections and allergic reactions caused by lens deposits. The disposable lens can directly avoid or greatly reduce the risk of lens deposits. For example, daily disposable lenses are thrown away after one use, and there is a problem of sediment. This is why we have been vigorously promoting short-cycle products. Pre-match inspection, purchase qualified products, guaranteed hygiene, intermittent wear, stop wearing it in time if discomfort occurs, and seek medical treatment in time to avoid avoidable risks and minimize the inevitable. Contact lenses (including cosmetic lenses) can still be worn . If you think: wear a contact lens so many things, just find a platform to buy and wear it, and you can see clearly; so many people buy and buy casually without wearing it; big brands are expensive and cheap, so you can kneel; hygiene is very poor , Bacteria are useless; if compliance is not enough, luck will come together; then don’t wear it, trust represents, get bright.