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Phoria measurements indicate differences in visual alignment at varying distances, suggesting effects of target color.
Von Graefe phoria measurements were obtained for ten prepres‐byopic subjects at 40 cm and 6 m test distances using a vertical column of black letters on red, green, and white backgrounds. Phorias measured at 40 cm using red and white target backgrounds were similar, but the phoria measured using a green target background indicated a change toward greater exophoria. No difference in phoria measurements was found between all targets at 6 m.
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Strong et al. (1982) studied this question.
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