Increase of the short-term fluctuation of the differential light threshold around a physiologic scotoma.
Because determination of the differential light threshold of a visual field is a psychophysiologic test, the results can be subject to variation. This scatter measured during a single examination is usually called the short-term fluctuation. Increases of the short-term fluctuation were thought to occur primarily in abnormal visual fields; however, we found an increase of the short-term fluctuation in normal visual fields when the measurements were made at the border of a physiologic scotoma, such as the blind spot. These results suggest that an increase of the short-term fluctuation may be mainly related to measurements done with any static perimeter at the border of a depression of the island of vision.
Haefliger
I O
IO
Clinique d'Ophtalmologie, Hôspital Cantonal Universitaire, de Genève, Switzerland.
Flammer
J
J
D000328:Adult; D015350:Contrast Sensitivity; D004056:Differential Threshold; D006801:Humans; D008027:Light; D009898:Optic Disk / Q000502:physiology*; D010775:Photic Stimulation; D012542:Scattering, Radiation; D012607:Scotoma / Q000503:physiopathology; D058609:Visual Field Tests; D014794:Visual Fields