Audiology and hearing health professionals in developed and developing countries (2002), Lyn et al. (1998), and Swart et al. (1995), impacted cerumen is one of the most common ear diseases and causes of hearing loss, with prevalence rate between 7.4% and 63%. Additionally, otoscopy does not require a great deal of expertise beyond basic training and is useful to refer a child when the tympanic membrane cannot be visualized due to occlusion of the external auditory meatus by cerumen. Pure-tone audiometry screening, in which there is typically no attempt to find threshold, has been found to accurately assess hearing status in children six years and older, when trained health workers
Through the Looking Glass and What Walter Found There Peter gives a slight smile then returns his attention to Walter. A few seconds later, he looks back up down the aisle and sees the world the way the Observers see it, machine-like and devoid of most colors. His eyes widen in surprise as the episode ends. "Through the Looking Glass and What Walter Found There" was written by co-executive producer David Fury, while being directed by "24" vet Jon Cassar. The title is a reference to Lewis Carrol's 1871 work "Through the Looking Glass and What Alice Found There", better known by its shortened title "Through the Looking Glass".