Eye chart chart or Jaeger chart can be used. While the Snellen chart remains the default, some authors have argued that the logMAR chart is superior. The logMAR chart presents the same number of symbols on each line, uses a typeface with letters that are equally legible at various sizes, and by varying the symbol size logarithmically, it is easier to use at nonstandard distances. As a consequence of these improvements, the logMAR chart has been proposed as a more reliable tool for measuring visual acuity. However, the logMAR chart has not yet been widely adopted. It can be difficult to measure
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