Distance visual acuity was measured monocularly and binocularly after a pre-test was done.
Aghafekokhian B. Osaiyuwu, George N. Atuanya 2015, 'Comparing visual acuity in preschool children using the Lea symbols and Sheridan Gardinercharts', African Vision and Eye Healthhttps://avehjournal.org/index.php/aveh/article/view/22. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)