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 Name of the Doctor" received overnight ratings of 5.46 million viewers on BBC One. When viewers who watched the episode later on were taken into account, the figure rose to 7.45 million, making "Doctor Who" the third most-watched programme of the week on BBC One. The episode received an Appreciation Index of 88. The episode received positive reviews. Mark Snow of IGN gave the episode 9.1/10, praising the final conversation between the Doctor and River Song, as well as the revelation about Clara; however he noted that the Great Intelligence was "a little underwhelming" and "not very threatening", and that