Introduction Of An Infant/Preschool Visual Acuity Test Along With A Comparison Of The Lighthouse Flash Card Series To The Snellen Acuity Test.

The purpose of our study was to establish validity for a modified visual acuity system employing Landolt C's yet eliminating the complexity of the psychometric series. The study also compared the standard projected Snellen acuity chart to the Lighthouse cards. Further we compared the Snellen chart to the modified Landolt C system. Finally the modified Landolt C system was employed with a group of preschool children to establish practicality of
the system as well as validity.