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 Most people like themselves. The halo effect of self-esteem spreads to any attributes associated with the self, including the name and its letters. As early as 1926 Syz discovered that a person's own name is special compared to others, eliciting physical responses measurable on the skin. It is thought that when a person recognizes the letters in his or her name, that person experiences positive feelings of implicit self-esteem. These positive feelings induce subjects to unknowingly select the letters of their own name, producing the name-letter effect. In psychological assessments, the name-letter effect has been exploited to measure self-esteem. There