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
Name-letter effect work has been called "seminal" by Stieger, Voracek, and Formann in their 2012 meta-analysis of 44 publications on the effect. Their meta-analysis found no trace of publication bias. In her 2014 meta-analysis of dozens of name-letter effect studies, Hoorens called the effect robust. She noted robustness in: Various explanations for the name-letter effect have been explored. Several explanations which seemed plausible at first have since been rejected. People may simply like most what they see most. Letters that appear more frequently in everyday usage also occur more often in people's names. Forer, in 1940, and Alluisi and Adams, in 1962,