Editing Vernier scale (section)

===Vernier acuity===

{{Main article|Vernier acuity}}
Vernier scales work so well because most people are especially good at detecting which of the lines is aligned and misaligned, and that ability gets better with practice, in fact far exceeding the optical capability of the eye. This ability to detect alignment is called ''[[vernier acuity]]''.<ref>[http://cancerweb.ncl.ac.uk/cgi-bin/omd?Vernier+acuity Vernier acuity definition] at the Online Medical Dictionary.</ref> Historically, none of the alternative technologies exploited this or any other hyperacuity, giving the vernier scale an advantage over its competitors.<ref name="Kwan2011">{{cite journal |last=Kwan |first=A. |date=2011 |title=Vernier scales and other early devices for precise measurement |journal=American Journal of Physics |doi=10.1119/1.3533717 |volume=79 |issue=4 |pages=368–373|bibcode=2011AmJPh..79..368K }}</ref>