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
Name-letter effect to a significant degree. The effect was also found when only looking at letters in family names, as well as only first name letters. The name-letter effect emerged as very significant in all languages when only initials were considered. There was a probability of 0.46 that initial letters were chosen amongst the top-six letters. Further analysis revealed that the overall name-letter effect is not simply due to initials: when excluding initials a name-letter effect was still found across all languages. Nuttin analyzed the data to see if there was a national-letter effect, but failed to find one. Norwegians did not