Visual acuity: calculating appropriate averages

Acta Ophthalmol (Copenh). 1993 Jun;71(3):296-300. doi: 10.1111/j.1755-3768.1993.tb07138.x.


Controversy surrounds the averaging of visual acuity scores. We examine this debate and provide a series of guidelines and worked examples to enable investigators to select an average (e.g. arithmetic mean, geometric mean, median) appropriate for their data.

MeSH terms

  • Humans
  • Reference Values
  • Statistics as Topic / methods*
  • Visual Acuity*