Silver Book Fact
Around $62 million a year is spent on guide dogs for individuals 40 years and older with visual impairment (in 2004 dollars).
Rein D, Zhang P, Wirth K, Lee P, et al. The Economic Burden of Major Adult Visual Disorders in the United States. Arch Opthalmol. 2006; 124(12): 1754-60. http://archopht.ama-assn.org/cgi/content/abstract/124/12/1754