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Dark adaptation with interposed white adapting fields

  • Ch. D. Bernholz
  • L. Spillmann
  • V. DaForno
Article

Abstract

It is proposed that dark adaptation following a moderate pigment bleach may nearly as well be carried out (and more conveniently) under low room lighting conditions as in complete darkness. To test this idea, dark adaptation curves were determined either immediately after the termination of a 3 min, 4.1 log td white pre-exposure field, or following 10 or 15 min of additional exposure to one of three low-level photopic (2.9, 2.4, 1.8 log td) backgrounds ofwhite light. Dark thresholds measured after the additional exposure fell rapidly and reached the rod plateau of the normal dark adaptation curve with a maximaldelay of 1.5 min (for the 10 min backgrounds) or 6.5 min (for the 15 min backgrounds). For the time to be spent in the dark, this meant asavings of 8.5 min. At smaller delays savings were even greater. The difference between savings and delay indicates whether or not an interposed background is feasible.

Keywords

Dark Adaptation Room Lighting Additional Exposure Dark Adaptation Curve Moderate Pigment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Wir untersuchten, ob die Dunkeladaptation nach einer mittelstarken Pigmentbleichung nicht fast ebenso gut (und bequemer) bei niedriger Raumbeleuchtung erfolgen kann wie in völliger Dunkelheit. Um dies zu testen, wurden Dunkeladaptationskurven auf zweierlei Weise bestimmt: Sofort nach dem Erlöschen einer weißen Vorbelichtung von 3 min Dauer und 4.1 log td retinaler Beleuchtungsstärke; oder nach zusätzlicher Belichtung durch einen von dreiweißen Hintergründen von 2.9, 2.4 oder 1.8 log td für 10 oder 15 min. Dunkelschwellen, die nach der zusätzlichen Adaptation an die Hintergründe gemessen wurden, fielen schnell ab und erreichten den Endwert der normalen Dunkeladaptationskurve mit einerVerzögerung von höchstens 1.5 min (bei den 10 min Hintergründen) oder 6.5 min (bei den 15 min Hintergründen). Bezogen auf die Zeit, die in völliger Dunkelheit zugebracht werden mußte, bedeutet dies eineEinsparung von 8.5 min. Bei geringeren Verzögerungen war die Einsparung entsprechend größer. An dem Unterschied zwischen der Einsparung und der Verzögerung läßt sich ablesen, ob ein zusätzlicher Hintergrund angebracht ist.

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Copyright information

© Springer-Verlag 1982

Authors and Affiliations

  • Ch. D. Bernholz
    • 1
  • L. Spillmann
    • 2
  • V. DaForno
    • 3
  1. 1.Department of PsychologyMcMaster UniversityHamiltonCanada
  2. 2.Neurologische Universitätsklinik mit Abteilung für NeurophysiologieFreiburgGermany
  3. 3.Department of PsychologyKansas State UniversityManhattanUSA

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