Eye chart number). The denominator indicates the distance in feet at which a person with normal vision could stand to correctly identify the same symbols identified by the person tested. For example, a visual acuity of 20/20 is considered normal. Numerous types of eye charts exist and are used in various situations. For example, the Snellen chart is designed for use at 6 meters or 20 feet, and is thus appropriate for testing distance vision. There is often also a need to test a subject's vision at near or occupational tasks (such as reading or computer use). For these situations, a Rosenbaum
The Name of the Doctor The Name of the Doctor "The Name of the Doctor" is the thirteenth and final episode of the seventh series of the British science fiction television series "Doctor Who". It was first broadcast on BBC One on 18 May 2013. It was written by Steven Moffat and directed by Saul Metzstein. The episode was watched by 7.45 million viewers in the UK and received positive reviews from critics. In the episode, an entity called the Great Intelligence (Richard E. Grant) kidnaps Victorian-era detectives Madame Vastra (Neve McIntosh) and Jenny Flint (Catrin Stewart) and their butler Strax (Dan Starkey) to force