A long-term chromatic adaptation mechanism

Peter B. Delahunt, Michael A. Webster, Lei Ma, John S Werner

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Purpose. The optical density of the human crystalline lens progressively increases with age and causes a shift in the spectral distribution of light reaching the retina. Yet color appearance is remarkably stable across the life span. When the lens is removed, cataract patients often report that the world looks much 'bluer' and this effect can last for many weeks. This suggests a process involving a long-term adaptive mechanism. We examined this adaptive mechanism by studying color appearance changes before and after cataract surgery. Methods. Lens absorption was measured by comparing absolute scotopic thresholds from 410 to 600 nm before and after surgery. Color appearance shifts were quantified using achromatic settings made on a calibrated CRT. Chromaticity was adjusted in CIE u'v' color space with luminance fixed at 30cd/m2, on a black background. The test area flashed on and off at 3s intervals. The achromatic settings were made before surgery and at various intervals after surgery up to one year. Results. Following surgery, there is an increase in short-wave light, mainly below 500 nm, reaching the retina. This has a large impact on S-cone quantal catch and a smaller impact on the M- and L-cones. The achromatic settings showed a large shift in the 'yellow' direction after surgery that gradually (but never fully) returned to the original setting over the course of a year. Conclusion. After cataract surgery, the intensity of the light at lower visible wavelengths increases substantially and results in a shift in color appearance. Over a period of several months, the visual system adapts to compensate for this change.

Original languageEnglish (US)
JournalJournal of Vision
Volume2
Issue number10
DOIs
StatePublished - 2002

Fingerprint

Color
Cataract
Light
Lenses
Retina
Radio Waves
Crystalline Lens

Keywords

  • Color & optics posters

ASJC Scopus subject areas

  • Ophthalmology

Cite this

A long-term chromatic adaptation mechanism. / Delahunt, Peter B.; Webster, Michael A.; Ma, Lei; Werner, John S.

In: Journal of Vision, Vol. 2, No. 10, 2002.

Research output: Contribution to journalArticle

Delahunt, Peter B. ; Webster, Michael A. ; Ma, Lei ; Werner, John S. / A long-term chromatic adaptation mechanism. In: Journal of Vision. 2002 ; Vol. 2, No. 10.
@article{b5809f7af65d405a97e439539d662dd3,
title = "A long-term chromatic adaptation mechanism",
abstract = "Purpose. The optical density of the human crystalline lens progressively increases with age and causes a shift in the spectral distribution of light reaching the retina. Yet color appearance is remarkably stable across the life span. When the lens is removed, cataract patients often report that the world looks much 'bluer' and this effect can last for many weeks. This suggests a process involving a long-term adaptive mechanism. We examined this adaptive mechanism by studying color appearance changes before and after cataract surgery. Methods. Lens absorption was measured by comparing absolute scotopic thresholds from 410 to 600 nm before and after surgery. Color appearance shifts were quantified using achromatic settings made on a calibrated CRT. Chromaticity was adjusted in CIE u'v' color space with luminance fixed at 30cd/m2, on a black background. The test area flashed on and off at 3s intervals. The achromatic settings were made before surgery and at various intervals after surgery up to one year. Results. Following surgery, there is an increase in short-wave light, mainly below 500 nm, reaching the retina. This has a large impact on S-cone quantal catch and a smaller impact on the M- and L-cones. The achromatic settings showed a large shift in the 'yellow' direction after surgery that gradually (but never fully) returned to the original setting over the course of a year. Conclusion. After cataract surgery, the intensity of the light at lower visible wavelengths increases substantially and results in a shift in color appearance. Over a period of several months, the visual system adapts to compensate for this change.",
keywords = "Color & optics posters",
author = "Delahunt, {Peter B.} and Webster, {Michael A.} and Lei Ma and Werner, {John S}",
year = "2002",
doi = "10.1167/2.10.31",
language = "English (US)",
volume = "2",
journal = "Journal of Vision",
issn = "1534-7362",
publisher = "Association for Research in Vision and Ophthalmology Inc.",
number = "10",

}

TY - JOUR

T1 - A long-term chromatic adaptation mechanism

AU - Delahunt, Peter B.

AU - Webster, Michael A.

AU - Ma, Lei

AU - Werner, John S

PY - 2002

Y1 - 2002

N2 - Purpose. The optical density of the human crystalline lens progressively increases with age and causes a shift in the spectral distribution of light reaching the retina. Yet color appearance is remarkably stable across the life span. When the lens is removed, cataract patients often report that the world looks much 'bluer' and this effect can last for many weeks. This suggests a process involving a long-term adaptive mechanism. We examined this adaptive mechanism by studying color appearance changes before and after cataract surgery. Methods. Lens absorption was measured by comparing absolute scotopic thresholds from 410 to 600 nm before and after surgery. Color appearance shifts were quantified using achromatic settings made on a calibrated CRT. Chromaticity was adjusted in CIE u'v' color space with luminance fixed at 30cd/m2, on a black background. The test area flashed on and off at 3s intervals. The achromatic settings were made before surgery and at various intervals after surgery up to one year. Results. Following surgery, there is an increase in short-wave light, mainly below 500 nm, reaching the retina. This has a large impact on S-cone quantal catch and a smaller impact on the M- and L-cones. The achromatic settings showed a large shift in the 'yellow' direction after surgery that gradually (but never fully) returned to the original setting over the course of a year. Conclusion. After cataract surgery, the intensity of the light at lower visible wavelengths increases substantially and results in a shift in color appearance. Over a period of several months, the visual system adapts to compensate for this change.

AB - Purpose. The optical density of the human crystalline lens progressively increases with age and causes a shift in the spectral distribution of light reaching the retina. Yet color appearance is remarkably stable across the life span. When the lens is removed, cataract patients often report that the world looks much 'bluer' and this effect can last for many weeks. This suggests a process involving a long-term adaptive mechanism. We examined this adaptive mechanism by studying color appearance changes before and after cataract surgery. Methods. Lens absorption was measured by comparing absolute scotopic thresholds from 410 to 600 nm before and after surgery. Color appearance shifts were quantified using achromatic settings made on a calibrated CRT. Chromaticity was adjusted in CIE u'v' color space with luminance fixed at 30cd/m2, on a black background. The test area flashed on and off at 3s intervals. The achromatic settings were made before surgery and at various intervals after surgery up to one year. Results. Following surgery, there is an increase in short-wave light, mainly below 500 nm, reaching the retina. This has a large impact on S-cone quantal catch and a smaller impact on the M- and L-cones. The achromatic settings showed a large shift in the 'yellow' direction after surgery that gradually (but never fully) returned to the original setting over the course of a year. Conclusion. After cataract surgery, the intensity of the light at lower visible wavelengths increases substantially and results in a shift in color appearance. Over a period of several months, the visual system adapts to compensate for this change.

KW - Color & optics posters

UR - http://www.scopus.com/inward/record.url?scp=2042428693&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=2042428693&partnerID=8YFLogxK

U2 - 10.1167/2.10.31

DO - 10.1167/2.10.31

M3 - Article

AN - SCOPUS:2042428693

VL - 2

JO - Journal of Vision

JF - Journal of Vision

SN - 1534-7362

IS - 10

ER -