reduced test with 8 cards for testing of infants (6 months to 3 years), low vision or disabled adults - the half set includes 8 cards ranging from .23 to 26.0 cpcm -the 8 plates (half set) has VA steps: 20/30, 20/60, 20/100, 20/200, 20/400, 20/800, 20/1600, 20/3200 (equivalent to VA decimal: 0,66, 0,33, 0,20, 0,10, 0,05, 0,025, 0,0125, 0,00625) - a manual is included with each set