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Functional visual fields: relationship of visual field areas to self-reported function.

Hikmat Subhi1, Keziah Latham1, Joy Myint2

  • 1Anglia Ruskin University, Cambridge, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|March 11, 2017
PubMed
Summary

Visual field loss significantly impacts daily function, especially mobility. The peripheral and inferior visual fields are key predictors of overall and mobility function, informing better visual field assessments.

Keywords:
mobility functionself-reported functionvisual fields

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Rehabilitation Medicine

Background:

  • Visual field loss is a common consequence of various eye conditions.
  • Understanding the functional impact of visual field loss is crucial for patient care and rehabilitation.
  • Current assessments may not fully capture the real-world functional consequences of visual field deficits.

Purpose of the Study:

  • To establish the relationship between specific visual field areas and functional difficulties.
  • To guide the development of a binocular visual field assessment that accurately reflects functional consequences.
  • To identify which visual field regions are most critical for overall and mobility function.

Main Methods:

  • Fifty-two participants with peripheral visual field loss underwent binocular visual field testing using Humphrey Field Analyser (30-2 and 60-4 SITA Fast programs).
  • Mean thresholds for different visual field areas were calculated.
  • Binocular visual acuity, contrast sensitivity, near reading performance, and self-reported overall and mobility function (using the Dutch ICF Activity Inventory) were assessed.

Main Results:

  • Greater overall visual field loss (0-60°) correlated with worse self-reported overall and mobility function.
  • Both central (0-30°) and peripheral (30-60°) visual field areas were significantly related to mobility function.
  • The peripheral visual field (30-60°) and the inferior visual field emerged as the strongest predictors of mobility function in regression analyses.

Conclusions:

  • The mean threshold of the binocular visual field, particularly to 60° eccentricity, is a strong predictor of self-reported function, especially mobility.
  • The peripheral visual field (30-60°) is a critical, and often underestimated, predictor of mobility function.
  • The inferior visual field is a slightly stronger predictor of perceived overall and mobility function compared to the superior visual field.