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The EOG ratio and its evaluation of retinal function
Journal of the American Optometric Association
|September 1, 1977
Summary
Normal visual field ratios, assessed with 10 ft. lambert ganzfield illumination, exceed 200%. Ratios between 175% and 200% are suspicious, while below 175% indicate potential pathology.
Area of Science:
- Ophthalmology
- Visual Science
- Medical Diagnostics
Background:
- Establishing normal parameters for visual field testing is crucial for accurate diagnosis.
- Individual variations in patient responses can affect the interpretation of visual field data.
Purpose of the Study:
- To define normal ranges for visual field ratios using standardized illumination.
- To differentiate between normal, low/suspicious, and abnormal visual field ratios.
Main Methods:
- Evaluation of 116 normal visual field ratios.
- Utilized 10 ft. lambert ganzfield illumination for standardized testing.
Main Results:
- Ratios exceeding 200% were confirmed as normal.
- A range of 175% to 200% was proposed as low or suspicious.
- Ratios below 175% were identified as abnormal and diagnostically significant.
Conclusions:
- The study provides clear thresholds for interpreting visual field ratios.
- Abnormal ratios below 175% are valuable indicators for diagnosing visual pathology.
- Standardized ganzfield illumination aids in reliable visual field assessment.