Snellen chart H, K, O, S, 3, U, Y, A, C, E, G, L, 2. The normal Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows have increasing numbers of letters that decrease in size. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific
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