Too Bright to Focus? Influence of Brightness Illusions and Ambient Light Levels on the Dynamics of Ocular Accommodation.

A marginally significant interaction between stimulus color and brightness illusion was observed, F (1, 31) = 3.235, p = 0.08, η 2 p = 0.094.

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A greater lag of accommodation was found in the low luminance contrast condition (photopic ambient) for the yellow stimulus compared to the high luminance contrast (mesopic ambient) with the yellow stimulus (mean difference = 0.052, t = 1.837, Cohen’s d = 0.131), although this difference did not reach statistical significance after Holm correction ( p -Holm = 0.379).

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Similarly, the lag of accommodation was greater in the photopic condition with the yellow stimulus compared to the photopic condition with the blue stimulus (mean difference = 0.041, t = 2.289, Cohen’s d = 0.105), but this difference also failed to reach significance after correction ( p -Holm = 0.174).

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