Related Experiment Videos
The human electro-oculogram: interaction of light and alcohol
1Applied Vision Research Centre, Department of Optometry, City University London, United Kingdom. g.arden@city.ac.uk
Investigative Ophthalmology & Visual Science
|August 11, 2000
Summary
Alcohol and light trigger similar voltage changes in the retinal pigment epithelium (RPE) via separate pathways converging on a common final route. This study reveals alcohol
Area of Science:
- Ophthalmology
- Neuroscience
- Pharmacology
Background:
- The electroretinogram (ERG) measures retinal function.
- The electrooculogram (EOG) specifically assesses retinal pigment epithelium (RPE) function.
- Light and certain substances can modulate RPE activity.
Purpose of the Study:
- To investigate voltage changes in the RPE induced by light and alcohol.
- To explore the interaction between light and alcohol in evoking these RPE voltage changes.
Main Methods:
- Human eye movement potential (EOG) recorded during altered retinal illumination or alcohol administration (oral, intragastric, intravenous).
- Experiments involved administration of light, alcohol, or both concurrently.
- Dose-response relationships for alcohol were examined.
Main Results:
- Alcohol and light produced nearly identical corneofundal voltage changes lasting over 40 minutes.
- Background light or low alcohol levels suppressed subsequent responses.
- Responses to light and alcohol occurred via independent pathways, converging in the RPE cell.
Conclusions:
- Alcohol and light converge on a common pathway within the RPE cell to generate EOG voltage oscillations.
- Alcohol's effect on RPE sensitivity and duration is comparable to melatonin and dopamine.
- Alcohol affects the RPE at concentrations lower than those required for most other known actions.