Ultraviolet lamp is not used for illumination, but for disinfection.
As we all know, disinfection is one of the effective ways to block the spread of viruses. With the gradual liberalization of epidemic prevention and control, more and more "little yang people" are isolated at home. How to effectively disinfect has become a hot topic. Some people say that the ultraviolet disinfection sterilization rate is as high as 99%, and 0.3 seconds is enough to reduce the infectivity of COVID-19.
There is a folk proverb that we believe everyone has heard, which is "it is better to believe in what is than to believe in what is". It exhorts the world not to arbitrarily deny the things that cannot be determined, and it is better to make preparations as early as possible. In addition, the disinfection work at home is really difficult. Many people have bought an ultraviolet disinfection lamp.
But is this view really correct? Is it really reliable to use ultraviolet disinfection equipment for family epidemic prevention?
First of all, ultraviolet rays can really sterilize. And in daily life, people often use ultraviolet disinfection, such as drying quilts in the sun is a typical example of using ultraviolet disinfection.
Secondly, the correct use of ultraviolet light can eliminate COVID-19, but it can reduce the infectious pathogenicity of COVID-19 within 0.3 seconds, which is not rigorous.
Strictly speaking, only when the light power (light energy per unit area) is strong enough, it is possible to disinfection and sterilization COVID-19 in 0.3 seconds. Moreover, there is no systematic and authoritative research or report that shows that the disinfection effect can be achieved in 0.3 seconds.
In addition, when it comes to family epidemic prevention, whether the ultraviolet disinfection equipment is really reliable, in fact, it is not very reliable.
Recently, various ophthalmic hospitals and ophthalmic out-patient clinics have received many patients with eye injuries caused by improper use of ultraviolet lamps.
The ultraviolet lamp can indeed achieve the function of sterilization and disinfection, but we should not forget that if it can play a role, it can prove that the ultraviolet energy it radiates is very large. Without protective measures, the human body is vulnerable, and the cornea bears the brunt.
The corneal epithelium is the first barrier of the eye, so it absorbs the most ultraviolet rays and is most vulnerable to tissue damage caused by ultraviolet rays. Ultraviolet rays have photochemical effect on tissues, causing protein coagulation and denaturation, corneal epithelium necrosis and shedding.
When ultraviolet rays enter the eyes, it is likely to cause electric ophthalmia, making both eyes painful, just like the eyes are covered with sand.
It is worth noting that the onset of electric ophthalmia often has a certain incubation period, which usually occurs 6 to 8 hours after exposure to ultraviolet light, and most of them are bilateral. This is why some people think it's OK to contact them for a short time. During the day, there is no feeling at the moment of contact, but they are all latent at night or even in the early morning, and then go to the doctor.
Of course, if symptomatic treatment is taken, the discomfort of the eyes will be obviously relieved after one or two days of medication. If the patient is unable to go to the hospital for special reasons, the patient can first apply ice to the eyes to relieve symptoms, close the eyes and rest more, and prepare artificial tears without preservatives to promote corneal repair. If the symptoms are not relieved or even worsened, you should go to the hospital as soon as possible.
Therefore, you should remember to close the doors and windows when using ultraviolet light to disinfect the room, and people should not stay in the room; It is advisable to disinfect for 30 minutes to 1 hour. After use, thoroughly ventilate for more than 30 minutes before entering; Animals and plants should also be removed to avoid looking directly at the UV lamp. It is recommended to use remote timing equipment to operate the UV lamp, especially to protect the elderly and children.
It is suggested that the household environment should be clean and ventilated. Keep the home ventilated, and open the window for ventilation 2 to 3 times a day for more than 30 minutes each time. Windows shall be opened for ventilation in the toilet, or the exhaust equipment shall be opened for ventilation.