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			| K K. Ball
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								K. K. Ball, T. . Owsley,  & B. L. Beard (1990) Clinical visual perimetry underestimates peripheral field problems in older adults, Clinical Vision Sciences, 5(2), 113-125
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								K. K. Ball, B. L. Beard, D. L. Roenker, R. L. Miller,  & D. S. Griggs (1988) Age and visual search: expanding the useful field of view, Journal of the Optical Society of America A, 5(12), 2210-2219
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