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Related Experiment Video

Updated: May 20, 2026

Simultaneous ex vivo Functional Testing of Two Retinas by in vivo Electroretinogram System
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Published on: May 6, 2015

Aging and cone dark adaptation.

Allannah J Gaffney1, Alison M Binns, Tom H Margrain

  • 1School of Optometry and Vision Sciences, Cardiff University, Cardiff, Wales, United Kingdom.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|July 10, 2012
PubMed
Summary

Dark adaptation, the process of regaining vision in dim light, slows with age. This age-related decline in cone recovery time may impact visual function and requires consideration when using it as a biomarker for eye diseases.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Human Physiology

Background:

  • Dark adaptation is crucial for vision in low light.
  • Impaired dark adaptation is a hallmark of age-related macular degeneration (AMD).
  • Cone dark adaptation is a potential biomarker for AMD.

Purpose of the Study:

  • To investigate the impact of aging on cone dark adaptation in healthy individuals.
  • To quantify the relationship between age and cone dark adaptation parameters.

Main Methods:

  • Studied 41 healthy adults (ages 20-83).
  • Induced a full cone photopigment bleach.
  • Monitored cone threshold recovery in the dark for 5 minutes.
  • Modeled recovery data to determine time constant (τ), initial, and final thresholds.
  • Used regression analysis to assess age-related changes.

Main Results:

  • Cone recovery time constant (τ) significantly increased with age (16.4 s/decade).
  • Indicates progressive slowing of dark adaptation in healthy adults.
  • No significant age-related changes in initial or final cone thresholds were observed.

Conclusions:

  • Cone dark adaptation slows significantly with age in healthy adults.
  • This age-related slowing may contribute to visual difficulties in dim light.
  • Accounting for age-related decline in cone τ is essential for its use as an AMD biomarker.