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 of which, subtitled "The Name of the Doctor", Strax informed the Sontarans of a great battle predicted to occur and admitting suspicions that it had to do with the Doctor's greatest secret. He informed Sontar that the operation was called "The Name of the Doctor". In the second, subtitled "A Glorious Day Is Almost Upon Us...", Strax discussed a 'glorious day' in which death was likely. The final field report — "The Doctor's Greatest Secret" — discussed the cliffhanger, commenting that this new Doctor had the appearance of a warrior. This was the only field report released after the episode.