Haidinger brushes

Hai·din·ger brush·es

(hī'ding-ĕr),

the perception of two dark yellowish brushes or sheaves radiating about 5 degrees from the point of fixation when an evenly illuminated surface, such as the blue sky, is viewed through a polarizing lens.

Hai·din·ger brush·es

(hī'ding-er brŭsh'ĕz)

The perception of two dark yellowish brushes or sheaves radiating about 5 degrees from the point of fixation when an evenly illuminated surface, such as the blue sky, is viewed through a polarizing lens.

Haidinger,

Wilhelm von, Austrian mineralogist, 1795-1871.

Haidinger brushes - the perception of two dark yellowish brushes when an evenly illuminated surface is viewed through a polarizing lens.