This Kay Picture Test has accurate LogMar sizing in a single picture format, suitable for testing children from about 2 years of age. The LogMar sizes are from 1.00 to 0.00 at a 3m testing distance. A side index identifies the chosen picture and acuity measurement in LogMar and Snellen metres and feet. At each size there is a choice of 3 or 4 pictures. Set comprises distance test book, near test card and key card. Size is 23 x 23 cm.