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Abstract #9191 Published in IGR 5-2
Classification of visual field abnormalities in the ocular hypertension treatment study
Keltner JL; Johnson CA; Cello KE; Edwards MA; Bandermann SE; Kass MA; Gordon MO; Ocular Hypertension Treatment Study GroupArchives of Ophthalmology 2003; 121: 643-650
OBJECTIVES: To develop a classification system for visual field (VF) abnormalities, to determine interreader and test-retest agreement, and to determine the frequency of various VF defects in the Ocular Hypertension Treatment Study. METHODS: Follow-up VFs are performed every six months and are monitored for abnormality, indicated by a glaucoma hemifield test result or a corrected pattern SD outside the normal limits. As of January 1st, 2002, 1636 patients had 2509 abnormal VFs. Three readers independently classified each hemifield using a classification system developed at the VF reading center. A subset (50%) of the abnormal VFs was reread to evaluate test-retest reader agreement. A mean deviation was calculated separately for the hemifields as an index to the severity of VF loss. MAIN OUTCOME MEASURES: A 97% interreader hemifield agreement. RESULTS: The average hemifield classification agreement (between any two of three readers) for 5018 hemifields was 97 and 88% for the 1266 abnormal VFs that were reread (agreement between the first and second classifications). Glaucomatous patterns of loss (partial arcuate, paracentral, and nasal step defects) composed the majority of VF defects. CONCLUSION: The Ocular Hypertension Treatment Study classification system has high reproducibility and provides a possible nomenclature for characterizing VF defects.
Dr. J.L. Keltner, Visual Field Reading Center, Department of Ophthalmology, University of California-Davis, Sacramento, CA 95817, USA. jlkeltner@ucdavis.edu
Classification:
6.6.2 Automated (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
