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 Eye of the Giant is forced to admit the truth, but Grover refuses to abandon his expedition on the word of people who claim to have travelled through Time. In order to prove his story, the Doctor suggests that Mike show Grover the “statue” in the pit, which the Doctor believes is in fact a dead alien in a life support suit. Upon arriving at the pit, the Doctor studies the statue for himself and finds a storage unit containing two Semquess drug vials and one empty space; he concludes that the third vial must have broken open in the past, releasing chemicals which