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Abstract #8156 Published in IGR 4-3
Normal isopter position in the peripheral visual field in Goldmann kinetic perimetry
Niederhauser S; Mojon DSOphthalmologica 2002; 216: 406-408
PURPOSE: Often in young patients the question arises of whether a disease state has reached the peripheral boundary of their visual field. Since the 'hill of vision' is steeper in the periphery, kinetic perimetry is more sensitive in detecting peripheral visual field abnormalities than static perimetry. In order to be able to detect mild peripheral visual field constrictions with kinetic perimetry, the authors determined the normal position of four isopters in the peripheral visual field. SUBJECTS AND METHODS: Intraindividual sensitivity variations of the isopters in the peripheral visual field were determined in three normal subjects by one perimetrist. Thereafter, in 22 subjects (aged 19-42 years) the position of isopters V4e, III4e, I4e and I3e was determined by one perimetrist. Visual fields were registered using a Goldmann kinetic perimeter. RESULTS: The intraindividual sensitivity variations (measured as 1 SD) for isopter V4e was 0.98° and for isopter I4e 1.13°. In order to visualize the normal isopter positions in the peripheral visual field, the average positions ± 2 SD were plotted for isopters V4e, III4e, I4e and I3e. CONCLUSIONS: In this study, the authors determined the normal position of four isopters frequently used to plot the peripheral visual field. The plots were printed on a scale of 1:4 in order to facilitate their use. Photocopying the figures on transparencies by scaling them by a factor of four will allow the transparencies to be superimposed on individual Goldmann kinetic visual fields in order to easily determine whether the individual isopters are inside or outside the normal range.
D. Mojon, MD, Department of Strabismus and Neuro-Ophthalmology, Kantonsspital, CH-9007 St Gallen, Switzerland. daniel.mojon@kssg.ch
Classification:
6.6.1 Conventional manual (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
