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The effect of ocular dominance on visual field testing
Paul G D Spry1, Judy E Furber, Richard A Harrad
1Bristol Eye Hospital, United Kingdom. paul.spry@ubht.swest.nhs.uk
Summary
Visual disturbances during standard automated perimetry (SAP) are common but do not significantly impact visual field test results or ocular dominance. These phenomena do not affect sensitivity or variability in threshold visual field analysis.
Area of Science:
- Ophthalmology
- Visual Neuroscience
Background:
- Standard automated perimetry (SAP) involves occluding one eye, which can lead to visual disturbances like rivalry or Ganzfeld blankout in the non-tested eye.
- These disturbances may be influenced by ocular dominance, potentially affecting test results.
Purpose of the Study:
- To investigate the relationship between ocular dominance and subjective visual disturbances during SAP.
- To determine if these disturbances impact the accuracy of threshold visual field analysis.
Main Methods:
- Ocular dominance was assessed in 55 normal subjects.
- Subjects underwent SAP (program 24-2 Full Threshold).
- Visual disturbances were reported post-testing, and their relationship to ocular dominance and visual field indices (short-term fluctuation, mean deviation, false-negative errors) was analyzed.
Main Results:
- 44% of subjects reported visual disturbances (rivalry or blankout).
- No significant association was found between ocular dominance and the occurrence of these disturbances.
- No significant differences in short-term fluctuation, mean deviation, or false-negative errors were observed between eyes with and without visual disturbances.
Conclusions:
- Subjective visual disturbances during SAP are common but do not significantly affect visual field quantification.
- Ocular dominance does not appear to influence visual field test results in terms of global indices.