Normal values in clinical electrooculography. III. Numerical evaluation of two dimensionless EOG parameters.

Area of Science:

• Ophthalmology
• Neuroscience
• Biomedical Engineering

Background:

• Electrooculography (EOG) measures the electrical potential difference between the cornea and retina.
• Dimensionless parameters like the Arden ratio (A) and Gliem quantity (G) are used to quantify EOG responses.
• Variability in EOG measurements necessitates evaluation of different analytical methods.

Purpose of the Study:

• To compare the distribution and variability of the Arden ratio (A) and the Gliem quantity (G) in normal human subjects.
• To assess the error accumulation in both A and G calculations.
• To determine if the Gliem quantity offers advantages over the Arden ratio for EOG analysis.

Main Methods:

• Collected EOG data from a sample of normal human subjects.
• Calculated the Arden ratio (A) and the Gliem quantity (G) for each subject.
• Analyzed the distribution (minimum, median, maximum values) and dispersion of A and G.
• Estimated the average accumulation of errors in the calculation of A and G.

Main Results:

• The Arden ratio (A) exhibited a smaller degree of dispersion (148-241-449) compared to the Gliem quantity (G) (34-88-167).
• The dispersion of G was comparable to other EOG potential parameters in the same sample.
• The average error accumulation was similar for both A and G.
• Discrepancies with previous studies were discussed.

Conclusions:

• The current investigation does not provide sufficient evidence to replace or supplement the Arden ratio with the Gliem quantity.
• The Arden ratio remains a preferred dimensionless parameter for EOG analysis due to its lower variability.
• Further research may explore other dimensionless EOG parameters or refine existing ones.