Visual learning

CreativeMedia who produced those excellent RSA Animate films mention on their website a quotation from Rudolph Arnheim's 'Visual Thinking':

"The great virtue of vision is that it is not only a highly articulate medium, but that its universe offers inexhaustibly rich information about the objects and events of the outer world. Therefore, vision is the primary medium of thought” (18).


This made me wonder if blind people appreciate theory in a different way. If someone loses their sight, what then of their thought processes, do they change?