Eye chart chart or Jaeger chart can be used. While the Snellen chart remains the default, some authors have argued that the logMAR chart is superior. The logMAR chart presents the same number of symbols on each line, uses a typeface with letters that are equally legible at various sizes, and by varying the symbol size logarithmically, it is easier to use at nonstandard distances. As a consequence of these improvements, the logMAR chart has been proposed as a more reliable tool for measuring visual acuity. However, the logMAR chart has not yet been widely adopted. It can be difficult to measure
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.