Seidel sign

Sei·del sign

(sī-del'),
a sickle-shaped scotoma appearing as an upward or downward extension of the blind spot.

Sei·del sign

(sī'del sīn)
A sickle-shaped scotoma appearing as an upward or downward extension of the blind spot, as may be found in glaucoma.

Seidel,

Erich, German ophthalmologist, 1882-1946.
Seidel scotoma - a form of Bjerrum scotoma.
Seidel sign - a sickle-shaped scotoma appearing as an upward or downward extension of the blind spot.