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Effect of uncorrected refractive errors upon central visual field testing

D B Henson1, E J Morris

  • 1Department of Optometry and Vision Sciences, University of Wales College of Cardiff, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|October 1, 1993
PubMed
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Uncorrected refractive errors can elevate visual field test thresholds, but this effect is unpredictable for individuals. However, these errors are unlikely to impact the detection of localized visual field defects during screening.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Refractive errors are common visual impairments.
  • Accurate visual field testing is crucial for diagnosing eye conditions.
  • The impact of uncorrected refractive error on visual field screening is not fully understood.

Purpose of the Study:

  • To investigate the effect of uncorrected refractive errors on central visual field examination.
  • To determine the impact of omitting refractive correction during visual field screening using a Henson CFA3000 device.

Main Methods:

  • A threshold-related, supra-threshold strategy was employed on the Henson CFA3000.
  • The study examined the relationship between refractive error, pupil size, and threshold elevation.
  • Visual field testing was conducted within the central 21 degrees of fixation.

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Main Results:

  • A linear relationship was observed between threshold elevation and the product of residual refractive error and pupil size.
  • Significant scatter in the data prevents accurate individual predictions.
  • Threshold elevation was independent of eccentricity and did not increase result variability.

Conclusions:

  • While uncorrected refractive errors influence visual field test thresholds, the variability limits individual prediction accuracy.
  • The findings suggest that uncorrected refractive errors are unlikely to compromise the sensitivity of this screening strategy for detecting localized visual field defects.