Quantification of interpoint topographic correlations of threshold values in glaucomatous visual fields

Area of Science:

• Ophthalmology
• Neuroscience
• Medical Imaging

Background:

• Glaucoma is a progressive optic neuropathy.
• Visual field testing is crucial for glaucoma diagnosis and management.
• Understanding spatial correlations in visual fields can improve testing.

Purpose of the Study:

• To quantify interpoint correlations of visual field threshold values in glaucoma patients.
• To investigate how these correlations relate to the retinal nerve fiber layer distribution.

Main Methods:

• Analysis of visual fields from 255 glaucoma patients using the Octopus 1-2-3 (32 program).
• Linear regression analysis to calculate correlation coefficients between visual field locations.
• Categorization of correlation strength: high (r(2) > 0.66), moderate (0.66 >= r(2) > 0.33), low (r(2) <= 0.33).

Main Results:

• High and moderate correlations were observed between neighboring and distant points within the same nerve fiber bundle areas.
• Low correlations were found between points in opposite hemifields, except temporal to the blind spot.
• Increased standard error of threshold estimation (0.6 to 0.9 dB) correlated with reduced r(2) values.

Conclusions:

• Visual field locations show strongest interpoint correlations with neighboring and distant points aligned with retinal nerve fiber layer distribution.
• Quantifying these correlations can aid in designing and interpreting visual field tests for glaucoma.
• This analysis provides insights into the spatial organization of visual field defects in glaucoma.