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Related Experiment Video

Updated: Aug 8, 2025

Driving Simulation in the Clinic: Testing Visual Exploratory Behavior in Daily Life Activities in Patients with Visual Field Defects
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Hidden blind spot and pseudofixation loss.

Tarannum Mansoori1

  • 1Department of Glaucoma, Anand Eye Institute, Habsiguda, Hyderabad, Telangana, India.

Indian Journal of Ophthalmology
|March 6, 2023
PubMed
Summary

Accurate blind spot mapping is crucial for visual field test reliability. This video explores reasons why the blind spot may not appear in the expected location on Humphrey visual field (HVF) printouts.

Area of Science:

  • Ophthalmology
  • Visual Science

Background:

  • Accurate mapping of the blind spot is essential for estimating fixation reliability in visual field testing.
  • Deviations from the expected blind spot location on Humphrey visual field (HVF) printouts warrant clinical consideration.

Purpose of the Study:

  • To present a series of cases where the blind spot was not found in its expected location on HVF printouts.
  • To explain the potential reasons behind the misplacement of the blind spot in visual field tests.

Main Methods:

  • Review of clinical cases with unexpected blind spot locations on HVF grayscale and numeric data.
  • Discussion of factors influencing blind spot presentation during perimetry.

Main Results:

  • Identified various reasons for the blind spot not appearing in the expected location.
Keywords:
Blind spot mappingFalse positive responseHumphrey visual field

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  • Highlighted potential artifacts that can affect blind spot mapping.

    • Conclusions:

    • Clinicians must recognize and address potential artifacts affecting blind spot location during perimetry.
    • Repeating the test is recommended if unexpected blind spot results are observed post-testing.