Amblyopia cannot be explained by considering only detection thresholds.
Threshold function and suprathreshold performance for nonacuity stimuli are compared for an amblyope who exhibits a low as well as a high spatial frequency threshold abnormality. The results show that (i) a suprathreshold abnormality involving discrimination and localization of easily visible stimuli occurs in amblyopia and (ii) suprathreshold abnormalities occur in amblyopia independent of any threshold dysfunction.
D000550:Amblyopia / Q000503:physiopathology*; D006801:Humans; D008029:Lighting; D012684:Sensory Thresholds; D014792:Visual Acuity