Readability Tool for Education Spaces
  Made by dr Piet van der Zanden 
Select your Distance from Projection Screen to Last Seat
                         
Lecture Hall Meeting Room                      
     
 
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22     20' (arcminute) is based on 100% visual acuity (about the size of TV subtitling)
24     17' is minimal discernible angle for proper reading based on 100% visual acuity
26     14' lets you just discern the characters when proper luminance and contrast
28     1' is minimal angle to discern any pixels or lines based on 100% visual acuity http://www.tudelft.nl/fileadmin/Files/medewerkersportal/mc/huisstijl/Downloads/TU_Delft_logo_Black.png