Eight commercially available pediatric acuity charts were used. The Allen figures (Hilco, Plainville, MA) were uncrowded single figures and the HOTV (Precision Vision, La Salle, IL, Cat. No. 2014), Lea Numbers (Good-Lite, Elgin, IL, #250100), Lea Symbols (Good-Lite, Elgin, IL, #271100), Lighthouse figures (Precision Vision, La Salle, IL, Cat. No. 3401), Patti Pics (Precision Vision, La Salle, IL, Cat. No. 2501), PV numbers (Precision Vision, La Salle, IL, Cat. No. 2711) and the Tumbling E (Precision Vision, La Salle, IL, Cat. No. 2316) charts were all standard, uncrowded, logarithmic line charts. The Landolt C test (Precision Vision, La Salle, IL, Cat. No. 2205) was included, as a ninth test, to provide data from an acuity test that was recommended as a standard by the Committee on Vision.
1