Clinical application of the multifocal VEPs

Citation
Y. Betsuin et al., Clinical application of the multifocal VEPs, CURR EYE R, 22(1), 2001, pp. 54-63
Citations number
20
Categorie Soggetti
da verificare
Journal title
CURRENT EYE RESEARCH
ISSN journal
02713683 → ACNP
Volume
22
Issue
1
Year of publication
2001
Pages
54 - 63
Database
ISI
SICI code
0271-3683(2001)22:1<54:CAOTMV>2.0.ZU;2-T
Abstract
Purpose. To determine whether visual field defects can be detected by the m ultifocal VEP technique. Methods. Multifocal VEPs were elicited by a pseudorandom binary m-sequence stimulus (VERIS II). The stimulus was a dartboard-like pattern of 61 sector s, and the luminance of each sector alternated between white and black. The stimulus area subtended approximately 25 degrees. Each recording was divid ed into 8 equal segments, and the total recording time was about 4 min. Mul tifocal VEPs were recorded from 25 normal subjects and six patients with vi sual field loss. The responses summed within 4 quadrants were used in the a nalysis and were compared with the visual fields obtained by perimetry. Results. In six perimetrically-documented visual field defects, the respons es summed over each quadrant of the field were reduced in the corresponding affected quadrants. In addition, recovery of the visual field loss followi ng treatment was accompanied by a recovery of the responses. Conclusions. Multifocal VEPs summed within four quadrants can be used for a n objective evaluation of the visual fields. The testing can be obtained in 4 min with no pain or discomfort to the patient.