 Abstract binocular rivalry, BR, is a visual phenomenon wherein each eye sees different images and stimuli, leading to alternating monocular dominance. In order to study BR, researchers often use two conflicting images to induce monocular alternation. However, some people with oblique astigmatism, OA, a condition characterized by blurriness on the oblique meridian of the eyes, experience more frequent BR than those without it. This suggests that OA may increase the likelihood of BR, as the blurriness may lead to increased stimulation of monocular alternations. This article was authored by Gazzarero, Maria Lev and Yuri Polet.