Lea Symbols Box Stick with optotype sizes and one line on each side: 20/320, 20/250, 20/160 and one side showing the sizes 20/63/ 20/50, 20/40, 2032 in ETDRS format. Inside has a rattle and there is a sticker on each end (star on one end, smiley apple on the other). Use at 40 cm / 16 inches. Dimensions: 12 x 1.5 x 1.5 cm.