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Abstract #15400 Published in IGR 1-3
Comparison of 24-2 and 30-2 perimetry in glaucomatous and nonglaucomatous optic neuropathies
Khoury JM; Donahue SP; Lavin PJ; Tsai JCJournal of Neuro-Ophthalmology 1999; 19: 100-188
OBJECTIVE: To determine whether the 24-2 Humphrey visual field (HVF) (Humphrey, San Leandro, CA) strategy provides information comparable to that provided by the 30-2 strategy in patients with optic nerve disease. METHODS: In part A of the study, an occluder device was designed to cover the additional outer 22 points tested in the 30-2 strategy of 187 HVFs from neuro-ophthalmology patients with nonglaucomatous optic neuropathy and 206 HVFs from patients with glaucoma. This device converted the gray scale and probability plots of the 30-2 HVF to a 24-2 field. Fields were initially read using the occluder and then were read in a masked manner without the occluder and compared. In part B, 15 healthy volunteers performed both 30-2 and 24-2 HVFs. Testing time and global indices were compared. Ninety-five percent of the fields in the neuro-ophthalmology patients, 96% of the fields in patients under observation for suspected glaucoma, 98% of the fields in patients with ocular hypertension, and 100% of the fields in patients with glaucoma were read similarly with the 24-2 and 30-2 strategies. In the few cases in which a discrepancy was noted between the 24-2 and the 30-2 fields, appropriate clinical management would not have been compromised by using the 24-2 strategy. Most of these cases were in patients with idiopathic intracranial hypertension and very subtle nerve fiber bundle defects. The 24-2 strategy had a significantly lower pattern standard deviation (p < 0.01) and corrected pattern standard deviation (p=0.05) than did the 30-2 strategy. In addition, the 24-2 strategy shortened the standard threshold testing time by 28% in normal volunteers (p < 0.0001). CONCLUSIONS: In most cases, the 24-2 testing strategy provides information comparable to that provided by the 30-2 strategy in a shorter time and with less variability. A 30-2 HVF may be warranted in patients under observation for evolving idiopathic intracranial hypertension.
Dr. J.M. Khoury, Department of Ophthalmology, Vanderbilt University School of Medicine, Nashville, TN: USA
Classification:
6.6.2 Automated (Part of: 6 Clinical examination methods > 6.6 Visual field examination and other visual function tests)
