The multifocal visual evoked potential: An objective measure of visual fields?
| Autor: | Vivienne C. Greenstein, Donald C. Hood, Karen Holopigian, William Seiple, C.J. Clemens |
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| Rok vydání: | 2005 |
| Předmět: |
Adult
medicine.medical_specialty genetic structures media_common.quotation_subject Multifocal visual evoked potential Audiology Stimulus (physiology) Optics Perception medicine Humans Attention Evoked potential media_common Intelligence Tests Monocular business.industry Middle Aged Divided attention Visual field eye diseases Sensory Systems Ophthalmology Electrophysiology Evoked Potentials Visual Visual Fields business Psychology Monocular vision Vigilance (psychology) |
| Zdroj: | Vision Research. 45:1155-1163 |
| ISSN: | 0042-6989 |
| Popis: | We examined the effects of inter-modal attention and mental arithmetic on Humphrey visual field sensitivity and multifocal visual evoked potential (mfVEP) amplitude. Four normally sighted subjects (ages ranging from 24 to 58years) participated in this study. Monocular visual field sensitivity was measured under two conditions: (1) standard testing condition and (2) while the subject performed a Paced Auditory Serial Addition Task (PASAT). Monocular mfVEPs were recorded in response to a 60-sector stimulus. The checkerboard pattern in each sector was contrast reversed according to a binary m-sequence. mfVEPs were recorded under two conditions: (1) standard testing conditions and (2) while the subject performed a PASAT. We found that, when compared to the no-task condition, all subjects had locations of significantly reduced Humphrey visual field sensitivities when performing the PASAT. In contrast, there were no significant decreases in mfVEP amplitude in any sector for any of the subjects while performing the PASAT. Our findings indicate that divided attention and ongoing mental processes did not affect the mfVEP. Therefore, the mfVEP provides an objective measure of visual field function that may be useful for some patients with unreliable automated static perimetry results. |
| Databáze: | OpenAIRE |
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