2020年5月29日 - 口罩已成为在努力战斗COVID-19司空见惯，但有的医生说现在是时候更进一步采取保护并重全面罩作为限制开始慢慢放松。
Face shields are nothing new in medical settings -- doctors and nurses who treat coronavirus patients are using them along with standard face masks. Health care professionals are split on whether they should also be worn by children, teachers, and in offices while states reopen.
“Face shields appear to have a number of advantages: They’re easy to wear correctly and good at blocking droplets,” says Eli Perencevich, MD, an infectious disease doctor at the University of Iowa and the Iowa City Veterans Affairs Health Care System. “They’re really a better option for protection.”
Perencevich and his colleagues published a report inJAMA上个月，认为增加的测试，接触者追踪和社交距离使用时面罩比标准的蒙版的更多COVID-战斗潜力。
A few things make shields superior, he says. For one, many people wear masks that don’t fit well, so they don’t work as well. They also prompt people to touch their faces more, increasing the risk of viral spread. They leave much to be desired in terms of comfort, he says, and they make it harder to breathe.
Shields come with the perk of being easily sanitized and reused, says Keith Kaye, MD, a professor of medicine and director of research for the division of infectious diseases at the University of Michigan Medical School.
Unlike masks, clear shields also allow for better communication -- people can read facial expressions, and those who are hearing impaired can read lips, he says.
Shields, meanwhile, have been found to successfully block droplets. Onecough simulation study in 2014found that a shield may reduce exposure by 96% when worn within 18 inches of someone coughing.
In addition, face masks are not meant to protect the wearer -- they leave other vulnerable parts of the face exposed, like the eyes. They are meant to keep an asymptomatic or pre-symptomatic person from它传播给他人.
Face shields are important in health care settings because, in those situations, mucous membranes around the caregivers’ eyes that could come into contact with harmful droplets while they do procedures like intubation, says Timothy Brewer, MD, a professor of medicine and epidemiology at the UCLA Fielding School of Public Health and Medicine.
“这可能在别人眼里可能获得，如果有人打喷嚏 - 这就是为什么打喷嚏的人也应戴口罩，”布鲁尔说。
与此同时，世界其他地区正迎来使用面罩医院之外的。School children in Singapore被给予面罩，因为他们后脑勺类在未来的日子里。
亚马逊announcedthis month that its engineers are developing face shields to sell on its site after donating almost 10,000 to people on the front lines.
Other efforts have come from everyday citizens. Katherine Marcano-Bell and her family have converted part of their 1,300-acre pig farm into a shield-making operation, and have delivered them to hospitals, clinics, meatpacking plants, and families who have made specific requests for them.