Notations for vision testing at 4 meters (13 ft.)
Proportional spacing
Acuity range 40M to 1.6M (20/200, 6/60 to 20/8, 6/2.4 equiv.)
Two smaller groups 6.3M to 1.6M for repetitive testing (20/32, 6/9.5 to 20/8, 6/2.4 equiv.)
Measures 62 X 65 cm (24.5 X 25.5 in.)
Fits ETDRS Illuminator Cabinet CAT. NO. 2425
Eye chart can be wall-mounted
Includes response key (Cat.No. 2517 and 2518)
Patti Pics use 5 symbols that are easily recognizable and fun for children. The symbols include House, Apple, Circle, Square, and Star. Each optotype has been calibrated to be equally difficult and to blur equally at threshold. This calibration coupled with Patti Pics being based from the Sloan standard, help to minimize any unintended loss or gain of lines during the transition from pediatric charts to adult charts.
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