Frick, K. D., Kymes, S. M., Lee, P. P., Matchar, D. B., Pezzullo, M. L., Rein, D. B., … Vancouver Economic Burden of Vision Loss Group. (2010). The cost of visual impairment: purposes, perspectives, and guidance. Invest Ophthalmol Vis Sci, 51(4), 1801–1805. https://doi.org/10.1167/iovs.09-4469

Frick, Kevin D., Steven M. Kymes, Paul P. Lee, David B. Matchar, M Lynne Pezzullo, David B. Rein, Hugh R. Taylor, and Vancouver Economic Burden of Vision Loss Group. “The cost of visual impairment: purposes, perspectives, and guidance.” Invest Ophthalmol Vis Sci 51, no. 4 (April 2010): 1801–5. https://doi.org/10.1167/iovs.09-4469.

Frick KD, Kymes SM, Lee PP, Matchar DB, Pezzullo ML, Rein DB, et al. The cost of visual impairment: purposes, perspectives, and guidance. Invest Ophthalmol Vis Sci. 2010 Apr;51(4):1801–5.

Frick, Kevin D., et al. “The cost of visual impairment: purposes, perspectives, and guidance.” Invest Ophthalmol Vis Sci, vol. 51, no. 4, Apr. 2010, pp. 1801–05. Pubmed, doi:10.1167/iovs.09-4469.

Frick KD, Kymes SM, Lee PP, Matchar DB, Pezzullo ML, Rein DB, Taylor HR, Vancouver Economic Burden of Vision Loss Group. The cost of visual impairment: purposes, perspectives, and guidance. Invest Ophthalmol Vis Sci. 2010 Apr;51(4):1801–1805.