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
Superior letter o, r, s, and t. In English, however, 'h' is also sometimes rendered as a superior letter, as in 6th. In French, certain abbreviations are written with the first letter(s) of the word they represent, followed by the final letter(s) in superscript. The superscript in this case is sometimes optional. Most commonly, this appears in the abbreviations of personal titles: "M" (or "Mgr") stands for "monseigneur" ("Your Grace"), "M" (or "Mlle") for "mademoiselle" ("Miss"), "M" for "maître" ("Mr"), etc. Other abbreviations containing superior letters are "m" for "merchandise" ("merchandise"), "éch" for "échéance" ("due date"), and "M" for "métro" ("subway"). When