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. 2019 Jul 4;13:1137–1145. doi: 10.2147/OPTH.S201747

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© 2019 Quercia et al.

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Example of a subject verbally reporting a VS.

Note: While fixating on the visual display, if the subject experienced a VS they had to press a handheld button their right hand and say clearly to the experimenter from where the “red line” had disappeared, in this case at the level of the left-oriented arrow and the scissors.

Abbreviation: VS, visual scotoma.