Evaluation of contrast perception in visual snow syndrome


  • Patients with visual snow syndrome (VSS) demonstrate an impaired contrast threshold (CT) for the 15-Hz frequency of temporal modulation and the spatial frequency of 0.76 deg/s.

Why this matters

  • VSS is a disabling syndrome characterized by tiny flickering dots in the visual field and other visual symptoms, including panopsia and photophobia, but not much is known about whether VSS causes visual task impairment.

  • This study provides evidence that helps illustrate VSS-specific dynamic contrast vision changes, which may aid in developing treatment and management approaches.