A rare condition affecting both pupils with each registering a different response when a flashlight is swung between them, indicative of optic nerve dysfunction. Typically, flashing a light in one eye will cause both pupils to constrict, but if one pupil is defective, it will constrict less or dilate when light is shone on it. It may be caused by optic neuritis, optic chiasm, or optic tract lesions.

Also Known As

  • Relative Afferent Pupil Defect