Unveiling the foveal blue scotoma through an afterimage

Svein Magnussen, Lothar Spillmann, Frank Stürzel, John S Werner

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

The absence of short-wave-sensitive (S-) cones in the human foveola normally goes unnoticed, but the resulting foveal S-cone, or blue, scotoma can be visualized as the negative afterimage of a short-wavelength adapting field on a larger white background. The afterimage has an annular shape with a lighter inner region that corresponds to Maxwell's spot, and a small bright spot in the center corresponding to the foveal blue scotoma. We have shown that the visibility of the center spot in the afterimage approximately follows the spectral sensitivity curve of the S-cones. We further demonstrate that the central bright spot subtends a retinal area that is coincident with the tritanopic region of the foveola. The macular pigment distribution measured for the same observers also peaks in the central fovea, but has a relatively high density over a broader retinal region than the bright spot in the negative afterimage, and more closely corresponds to the lighter annular region of the afterimage. The results support the hypothesis of an active post-receptoral process for filling-in of chromatic scotomas.

Original languageEnglish (US)
Pages (from-to)377-383
Number of pages7
JournalVision Research
Volume44
Issue number4
DOIs
StatePublished - Feb 2004

Keywords

  • Foveal tritanopia
  • Perceptual filling-in
  • Scotoma
  • Stabilized images

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Fingerprint Dive into the research topics of 'Unveiling the foveal blue scotoma through an afterimage'. Together they form a unique fingerprint.

  • Cite this