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 to kill the Doctor's allies unless the Doctor says his name to unlock the TARDIS doors. The Doctor refuses, but as he speaks, River says the Doctor's name and unlocks the TARDIS. Inside, the Doctor reveals a pulsating column of light to be his time stream. The Great Intelligence enters it in order to undo the Doctor's past as revenge for all the defeats it has been dealt. The positive effects of the Doctor's travels begin to be nullified by the Intelligence's interference. Jenny and Strax both disappear. Clara remembers the Doctor telling her that she has helped the Doctor