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Abstract #24953 Published in IGR 11-4

Central field perimetry of discriminated targets: I. Results for normal individuals using high-contrast targets

Yavuz GA; Unver YB; Bekiroglu N; Presti P; Sinclair SH
Eye 2009; 23: 2082-2089

See also comment(s) by Shaban Demirel •

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Purpose: A new perimetry method is described to evaluate central vision under multiple hue, illumination, and contrast conditions; results are described for normal individuals using high-contrast targets. Methods: For 70 normal eyes of individuals with varying age, the ETDRS chart acuity was determined as well as discriminated target perimetry using high-contrast targets presented for 250 ms at locations up to 10° eccentricity. Retesting was performed to evaluate for learning and repeatability for the thresholded acuity at each eccentricity. Results: The ETDRS acuity averaged 1.150.37 arc min minimum angle of resolution (MAR) with best correction (20/23 equivalence). At fixation, the thresholded acuity for high-contrast targets paralleled the ETDRS acuity and averaged 1.750.85 arc min MAR (20/35 equivalence), and declined with increasing eccentricity in a linear fashion to 5.813.97 arc min (20/116 equivalent) at 10° eccentricity. Linear regression showed Vmar=1.74+0.330 eccentricity in degrees (R 2=0.966, P<0.0001). Testing time required 8–10 min per eye. Repeated testing showed only minimal learning experience at the most peripheral locations. The test–retest 95% confidence limits of difference measured 1.12 arc mins MAR at fixation (64% of the mean) and remained approximately the same proportion to the mean thresholded acuity outwards to 10° eccentricity. Conclusion The methodology seems rapid and reliable for measuring discriminatory visual function of optotype targets throughout the central 20° diameter visual field.

Department of Ophthalmology, School of Medicine, Düzce University, Düzce, Turkey

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Classification:

6.6.3 Special methods (e.g. color, contrast, SWAP etc.) (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)

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