portions of Bangerter foils are enclosed within an acrylic bar - it makes easy to determine the appropriate foil for use in amblyopia and diplopia - value: 1,0 - 0,8 - 0,6 - 0,4 - 0,3 - 0,2 - 0,1 - <0,1 - the Bangerter Foil Bar is used to determine when the preference switches from dominant eye to the less dominant eye - all available Bangerter Occlusion Foils are within the bar Acuity levels range from 1.0 to 0.0 ( 20/20 to Total Occlusion)