The contribution of spatial and border interactions to the "Westheimer effect".
D000221:Adaptation, Ocular; D005403:Fixation, Ocular; D006801:Humans; D008266:Macula Lutea / Q000502:physiology; D010783:Photometry; D013028:Space Perception; D014785:Vision, Ocular; D014792:Visual Acuity; D014794:Visual Fields