Fig. 6. Results of visual impairment experiment. Each dot represents the angular difference between an individual turtle's mean heading on Day 2 versus Day 1. Loggerheads in all three treatment groups maintained similar headings on Day 1 and Day 2. (A) No treatment; mean angle=356°, r=0.61, P<0.01 V-test, 95% confidence interval ±51°; (B) Goggles with no lenses; mean angle=9°, r=0.58, P<0.01 V-test, 95% confidence interval ±51°; (C) Goggles containing frosted lenses; mean angle=335°, r=0.60, P<0.01 V-test, 95% confidence interval ±48°. The expected direction in all cases was 0°. See text for statistical comparison of distributions.

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