What question did this study set out to answer?

This research aims to compare the Friedmann Visual Field Analyser with tangent screen perimetry in measuring central visual fields.

March 21, 2026

A Clinical Comparison of the Friedmann Visual Field Analyser and Tangent Screen Perimetry

Key Points

This research aims to compare the Friedmann Visual Field Analyser with tangent screen perimetry in measuring central visual fields.
Measured central visual fields of 44 optometric patients with known or suspected field defects.
Utilized the Friedmann Visual Field Analyser and a 2-m tangent screen for evaluation.
Assessed clinical correlation of visual field characteristics.
Over 90% of eyes showed at least adequate correlation in visual field characteristics.
Significant correlations were found between scotoma area on tangent screen and locations with reduced sensitivity.
Average reduction in sensitivity on FVA correlated with scotoma area on tangent screen.

Abstract

Abstract The central visual fields of 44 optometric patients with known or suspected field defects were measured with the Friedmann Visual Field Analyser (FVA) and a 2‐m tangent screen. The clinical correlation of visual field characteristics was at least adequate in more than 90% of eyes. Statistically significant correlations were also found between the area of scotoma found on the tangent screen and (1) the number of locations with reduced sensitivity and (2) the average reduction in sensitivity of the stimulated locations as determined by the FVA.

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