Eye chart smaller symbols until the person cannot identify the symbols. The smallest symbols that can be reliably identified is considered the person's visual acuity. The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test, Golovin–Sivtsev table, the Rosenbaum chart, and the Jaeger chart. Charts display several rows of optotypes, which are standardized symbols for testing vision. Optotypes are usually letters, numbers, or geometric symbols. Each row of the chart depicts optotypes of a different size. Typically the largest optotypes are in the top row. The optotypes become progressively
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.