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 looks forward and back". On 12 May 2013, a week before the official premiere of "The Name of The Doctor", it was announced that 210 "Doctor Who" fans in the United States had received their Blu-ray box set of the second half of the seventh series early due to a production error. After successfully requesting that they not reveal the plot, the BBC sent the recipients copies of an interview with the cast. Moffat later complimented the "210 of them, with the top secret episode in their grasp – and because we asked nicely, they didn't breathe a word." "The