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Functional visual fields: a cross-sectional UK study to determine which visual field paradigms best reflect

Hikmat Subhi1, Keziah Latham1, Joy Myint2

  • 1Department of Vision and Hearing Sciences, Anglia Ruskin University, Cambridge, UK.

BMJ Open
|November 23, 2017
PubMed
Summary

Visual field (VF) loss significantly impacts mobility. Binocular VF tests assessing up to 60° eccentricity are effective at predicting mobility difficulties, with kinetic assessment being a quick and efficient method.

Keywords:
Low VisionMobility FunctionPerimetrySelf-reported FunctionVisual FieldsVisual Impairment

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Visual field (VF) loss is a common consequence of various eye conditions.
  • Assessing the functional impact of VF loss on daily activities like mobility is crucial.
  • Current methods may not fully capture the relationship between VF impairment and mobility challenges.

Purpose of the Study:

  • To identify visual field assessment methods that best correlate with self-reported mobility difficulties.
  • To evaluate the effectiveness of different VF testing paradigms in reflecting functional vision loss.

Main Methods:

  • A cross-sectional study involving 50 adults with peripheral VF impairment.
  • Participants underwent standard and custom binocular VF tests (to 60°) and integrated monocular threshold visual fields (IVF).
  • VF outcomes were compared with the Independent Mobility Questionnaire and test duration.

Main Results:

  • Greater VF loss was strongly associated with increased self-reported mobility difficulty (R² 0.38-0.48, P<0.001).
  • All four tested binocular VF methods outperformed IVF in predicting mobility task difficulties.
  • Kinetic VF assessment was the quickest test, comparable in effectiveness to static threshold assessment.

Conclusions:

  • Binocular VF tests extending to 60° eccentricity effectively predict mobility function.
  • Kinetic assessment of VF area offers a rapid and reliable method for evaluating mobility-related visual impairment.
  • These findings support the use of specific binocular VF tests for assessing functional vision in patients with peripheral field loss.