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A method of scoring automated visual fields to determine field constriction causing blindness

L Dandona1, A Nanda

  • 1Public Health Ophthalmology Service, L.V. Prasad Eye Institute, Hyderabad, India. dandona@lvpeye.stph.net

Indian Journal of Ophthalmology
|December 16, 1998
PubMed
Summary

New criteria can now define blindness from constricted visual fields, even with good visual acuity. This method standardizes visual field testing for accurate blindness estimation and legal benefits.

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Area of Science:

  • Ophthalmology
  • Visual Science

Background:

  • Blindness is typically defined by visual acuity, neglecting visual field constriction.
  • Patients with constricted visual fields experience visual impairment despite good visual acuity.
  • Current automated static perimetry lacks standardized criteria for visual field constriction.

Purpose of the Study:

  • To propose a simple, standardized method for determining blindness due to visual field constriction.
  • To aid in the accurate assessment of visual impairment caused by reduced visual fields.

Main Methods:

  • Reviewed constricted visual fields from Humphrey automated static perimetry.
  • Divided the central 30-degree visual field into six concentric zones.
  • Developed criteria based on absolute (<= 0 dB) and relative (<= 5 dB) sensitivity loss.

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Main Results:

  • Proposed criterion: A zone with >= 75% test points <= 0 dB and no point > 10 dB indicates absolute sensitivity loss.
  • Included two exceptions to enhance criterion flexibility.
  • Demonstrated application for defining blindness with visual fields < 10 degrees, aligning with WHO standards.

Conclusions:

  • Standardized criteria for visual field constriction using automated perimetry can improve blindness estimation.
  • This method aids in accurate surveys and eligibility assessments for legal blindness benefits.