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Area of Science:

  • Ophthalmology
  • Visual Neuroscience
  • Medical Imaging

Background:

  • Glaucoma is characterized by progressive damage to the optic nerve, leading to functional vision loss.
  • Perimetric sensitivities, a measure of visual function, tend to become more variable as glaucoma advances.
  • Understanding the spatial patterns of this variability is crucial for accurate glaucoma diagnosis and monitoring.

Purpose of the Study:

  • To investigate how the relationship between perimetric sensitivity variability and glaucomatous functional loss differs across visual field locations.
  • To determine if eccentricity-related differences in spatial summation can predict these variations in variability.

Main Methods:

  • Longitudinal visual field data from standard automated perimetry (SAP) were analyzed from participants with suspected or existing glaucoma.
  • Heterogeneous fixed-effects models were used to assess the exponential increase in variability as sensitivity decreased at each location.
  • Predicted variability was calculated at 30 dB and 25 dB sensitivity levels for each visual field location.

Main Results:

  • Visual field variability significantly increased with glaucomatous damage across all 52 tested locations.
  • At 30 dB sensitivity, variability increased with eccentricity (P = 0.0003), being higher in peripheral locations (1.74 dB SD) than central ones (1.54 dB SD).
  • At 25 dB sensitivity, this eccentricity-related difference in variability disappeared (P = 0.340), with similar average SDs in central (2.36 dB) and peripheral (2.24 dB) locations.

Conclusions:

  • The relationship between sensitivity and variability in the visual field is influenced by eccentricity.
  • In healthy eyes, central locations exhibit lower variability than peripheral ones due to larger stimulus areas relative to Ricco's area.
  • In advanced glaucoma, this pattern reverses or disappears, potentially because Ricco's area expands, making stimuli smaller than this area across all locations.