Distance and size estimates and stereoacuity judgments were made in water by divers, both with and without facemasks. Without the mask, only stereoacuity was markedly degraded. Distance estimates were slightly more accurate, despite a great decrease in the range of visibility. Size estimates were slightly too small. Divers with refractive errors did not appear to be more handicapped than those ...

Facemasks have been widely used in hospitals, especially since the emergence of coronavirus 2019 (COVID-19) pandemic, often severely affecting respiratory functions. Masks protect patients from contagious airborne transmission, and are thus more specifically important for chronic disease (CRD) patients. However, masks also increase air resistance work breathing, which may impact pulmonary auscu...

In order to live safely with an exacerbation of the Coronavirus, a face mask must be made specifications that prevent infection or transmission among people; which is characterized by high efficiency and low cost, renewable. Fiberstructure widely used in air filtration industry using electrospinning method, where its field booming exceptionally impressive manner. Using biopolymer as olyhydroxya...

Background: Self-perception rate of bad breath is usually low. Unprecedented and massive use face masks throughout the Covid-19 pandemic could have a bearing on increased self-perception odour.
 Aims Objectives: To assess self-perceived odour (SPBO) associated with unprecedented wearing amidst pandemic.
 Methodology: A cross-sectional study was carried out involving 547 subjects. well...

The purpose of this study was to use the Peer Assesment Rating (PAR) index score to evaluate the treatment and posttreatment changes of Class III patients treated by protraction facemask. The sample consisted of 20 Chinese children, 6 to 11 years old, with Class III skeletal malocclusion who had been treated with maxillary expansion and a protraction facemask. The average treatment time was 8.2...