![Seidel sign Seidel sign](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8c/Types_of_scotomas_and_the_location_on_the_retina.png/400px-Types_of_scotomas_and_the_location_on_the_retina.png)
Seidel's sign (also called Seidel's scotoma) is a sickle-shaped scotoma that is a superior or inferior extension of the blind spot. It occurs in some patients with glaucoma.
In 1914, German ophthalmologist Erich Seidel first described the glaucomatous visual field defect, Seidel's scotoma.
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