Snellen E-chart

Snel·len E-chart

(snel'ĕn chahrt)
Direct visual testing tool useful in children older than 2 years but unable to read. Visual acuity is measured by showing letter Es, which are printed backward and rotated, and then having the child point to show the direction of the pointing letter.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012