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Related Concept Videos

Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category, whereas...
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Related Experiment Video

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Using Retinal Imaging to Study Dementia
09:17

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Published on: November 6, 2017

Differential changes in retina function with normal aging in humans.

Paul R Freund1, Juliane Watson, Gregory S Gilmour

  • 1Department of Ophthalmology, University of Alberta, Edmonton, Canada. pfreund2012@meds.uwo.ca

Documenta Ophthalmologica. Advances in Ophthalmology
|May 13, 2011
PubMed
Summary
This summary is machine-generated.

Full field electroretinogram (ERG) reveals age-related retina function changes in healthy individuals. Older adults showed altered responses, highlighting the need to consider aging effects in diagnosing eye conditions.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Gerontology

Background:

  • Retina function undergoes changes with age, impacting visual perception.
  • Understanding these age-related alterations is crucial for accurate diagnosis of visual pathologies.

Purpose of the Study:

  • To investigate age-related functional changes in the human retina using full-field electroretinogram (ERG).
  • To establish normative ERG data across different adult age groups for comparison.

Main Methods:

  • Full-field electroretinogram (ERG) recordings were performed on three age groups: 20-39, 40-59, and 60-82 years.
  • Tests included light and dark-adapted stimulus-response functions, dark adaptation, and recovery dynamics after a bright flash.

Main Results:

  • Older adults (60-82 years) exhibited a less pronounced photopic hill effect and altered photopic a-wave and b-wave amplitudes and implicit times.
  • Dark adaptation was delayed, dark-adapted a-wave amplitudes were reduced, and implicit times were prolonged, correlating with age.
  • Dark current recovery dynamics showed transient acceleration between 0.9 and 2 seconds in older subjects.

Conclusions:

  • Healthy aging of the retina is associated with specific functional alterations detectable by ERG.
  • These age-related ERG changes are important considerations for the optimal diagnosis of retinal diseases.