Seidel's sign (also called Seidel's scotoma) is a sickle-shaped

scotoma A scotoma is an area of partial alteration in the field of vision consisting of a partially diminished or entirely degenerated visual acuity that is surrounded by a field of normal – or relatively well-preserved – vision. Every normal mam ...

that is a superior or inferior extension of the blind spot. It occurs in some patients with

glaucoma Glaucoma is a group of eye diseases that result in damage to the optic nerve (or retina) and cause vision loss. The most common type is open-angle (wide angle, chronic simple) glaucoma, in which the drainage angle for fluid within the eye rem ...

History

In 1914, German ophthalmologist

Erich Seidel Erich Seidel is a retired West German slalom canoeist who competed in the early 1950s. He won a silver medal in the folding K-1 team event at the 1951 ICF Canoe Slalom World Championships The 1951 ICF Canoe Slalom World Championships were he ...

first described the glaucomatous

visual field defect The visual field is the "spatial array of visual sensations available to observation in introspectionist psychological experiments". Or simply, visual field can be defined as the entire area that can be seen when an eye is fixed straight at a point ...

, Seidel's scotoma.

References

{{med-sign-stub Medical signs Ophthalmology