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 their friend, time-travelling alien the Doctor (Matt Smith), to come the planet Trenzalore, the site of the Doctor's future grave. The Intelligence attempts to force the Doctor to open a door leading to his time stream, which the Intelligence intends to interfere with to undo all of his victories. "She Said, He Said" is a mini-episode that acts as a prelude to "The Name of the Doctor", in which the Doctor and Clara each have a monologue about how little they know about each other and that they discovered each other's secret at Trenzalore. It was released on on BBC