Unequal retinal illuminances and target contrasts and ghost images of anaglyphs are known to affect binocular vision. These properties were studied in red-green anaglyphic materials. For all three pairs of red-green glasses tested the relative photometric flux passed by the green lens was higher than that of the red. Differences ranged from 15.3% to 33.1%. In all combinations tested, contrast was also higher through the green lens when viewing red acetate than it was for the red lens when viewing green acetate. This suggests that red-green anaglyphic materials can affect binocular vision by altering the equality of retinal illuminances and by affecting suppression tendencies.
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