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Determining Spatial Summation and Its Effect on Contrast Sensitivity across the Central 20 Degrees of Visual Field

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  • Agnes Yiu Jeung Choi
  • Lisa Nivison-Smith
  • Sieu K Khuu
  • Michael Kalloniatis

Abstract

Purpose: Recent studies propose that the use of target stimuli within or close to complete spatial summation reveal larger threshold elevation in ocular disease. The Humphrey Visual Field Analyzer (HFA) is used to assess visual function yet the spatial summation characteristics are unexplored for the central macular region. We therefore wanted to establish the relationship between contrast sensitivity and stimulus size (spatial summation) within the central 20° visual field using the high sampling density of the 10–2 test grid. Methods: Thresholds were measured for one eye from 37 normal subjects using the HFA 10–2 test grid with all five Goldmann (G) targets (GI to GV). Subject data were converted to 50-year-old equivalent using published and calculated location-specific decade correction factors. Spatial summation curves were fitted for all data at all locations. The size of Ricco’s critical area (Ac) within which complete spatial summation operates (k = 1), and the slope of partial summation (k

Suggested Citation

  • Agnes Yiu Jeung Choi & Lisa Nivison-Smith & Sieu K Khuu & Michael Kalloniatis, 2016. "Determining Spatial Summation and Its Effect on Contrast Sensitivity across the Central 20 Degrees of Visual Field," PLOS ONE, Public Library of Science, vol. 11(7), pages 1-19, July.
    • Handle: RePEc:plo:pone00:0158263
    DOI: 10.1371/journal.pone.0158263
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