Clinical Pearl: The "Rule of 8"

J Pediatr Ophthalmol Strabismus. 2017 Nov 17:54:e75-e76. doi: 10.3928/01913913-20170907-08.


Preschool-aged children typically perform worse than 20/20 on visual acuity testing in the absence of ocular or visual pathway abnormalities due to non-ocular issues, including concentration, cooperation, and/or confidence. As a result, vision screening for this age group can be a challenge. The "Rule of 8" is an easy-to-remember, highly effective mnemonic that clinicians can use to help differentiate children who are performing visual acuity testing at age-appropriate levels from those who may need further evaluation. [J Pediatric Ophthalmol Strabismus. 2017;54:e75-e76.].

Publication types

  • Review

MeSH terms

  • Amblyopia / diagnosis*
  • Child, Preschool
  • Humans
  • Strabismus / diagnosis*
  • Vision Screening
  • Visual Acuity*