Eye chart smaller towards the bottom of the chart. The person removes any glasses or contact lenses, and stands or sits a standardized distance from the chart (e.g., 20 feet for the Snellen chart). The person is then asked to identify the optotypes on the chart, starting with large rows and continuing to smaller rows until the optotypes cannot be reliably identified any more. The row in which the person can reliably identify symbols defines the visual acuity. One eye is tested at a time. Practically, this is accomplished by covering the other eye with a hand, piece of paper, or a
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