The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment
Background and Aim: Objective measurement of visual acuity using VEP is high valued in patients with low levels of cooperation. Therefore, this study aimed to investigate the effect of spatial frequency on VEP components in visual acuity using Sweep VEP. Material and Methods: In this cross-sectional...
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| Format: | Article |
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Kurdistan University of Medical Sciences
2022-12-01
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| Series: | مجله علمی دانشگاه علوم پزشکی کردستان |
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| Online Access: | http://sjku.muk.ac.ir/article-1-6752-en.html |
| _version_ | 1827955057439539200 |
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| author | Monireh Mahjoob Javad Heravian |
| author_facet | Monireh Mahjoob Javad Heravian |
| author_sort | Monireh Mahjoob |
| collection | DOAJ |
| description | Background and Aim: Objective measurement of visual acuity using VEP is high valued in patients with low levels of cooperation. Therefore, this study aimed to investigate the effect of spatial frequency on VEP components in visual acuity using Sweep VEP.
Material and Methods: In this cross-sectional study 63 medical students with an age of 22.81 ± 3.93 were selected. After a completed eye examination, refractive error was determined, and best-corrected visual acuity as subjective was recorded by the Freiburg Acuity contrast test. Sweep VEP using the Roland electrophysiology system was recorded for various spatial frequencies from 2 to 37.5 cycles per degree. VEP components were the latencies of N1, P1, N135, and the amplitude of VEP.
Results: Repeated measures of the ANOVA test showed that the effect of spatial frequency on latencies and amplitude of VEP was significant (P<0.001). Paired T-test showed that there was a significant difference between subjective visual acuity and extrapolation of visual acuity with VEP (P<0.001).
Conclusion: According to the significant relationship between VEP amplitude and spatial frequencies of the visual stimuli obtained in this study, the Sweep VEP technique can be used as a valid and objective tool in the determination of visual acuity, especially in patients with low levels of cooperation. |
| first_indexed | 2024-04-09T14:39:58Z |
| format | Article |
| id | doaj.art-45c2a7af7c004e328aab4387dc2e6b61 |
| institution | Directory Open Access Journal |
| issn | 1560-652X 2345-4040 |
| language | fas |
| last_indexed | 2024-04-09T14:39:58Z |
| publishDate | 2022-12-01 |
| publisher | Kurdistan University of Medical Sciences |
| record_format | Article |
| series | مجله علمی دانشگاه علوم پزشکی کردستان |
| spelling | doaj.art-45c2a7af7c004e328aab4387dc2e6b612023-05-03T08:13:49ZfasKurdistan University of Medical Sciencesمجله علمی دانشگاه علوم پزشکی کردستان1560-652X2345-40402022-12-012758088The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity AssessmentMonireh Mahjoob0Javad Heravian1 Assistant Professor, Health Promotion Research Center/Department of Optometry, Zahedan University of Medical Sciences, Zahedan, Iran. Professor, Department of Optometry, Mashhad University of Medical Sciences, Mashhad, Iran Background and Aim: Objective measurement of visual acuity using VEP is high valued in patients with low levels of cooperation. Therefore, this study aimed to investigate the effect of spatial frequency on VEP components in visual acuity using Sweep VEP. Material and Methods: In this cross-sectional study 63 medical students with an age of 22.81 ± 3.93 were selected. After a completed eye examination, refractive error was determined, and best-corrected visual acuity as subjective was recorded by the Freiburg Acuity contrast test. Sweep VEP using the Roland electrophysiology system was recorded for various spatial frequencies from 2 to 37.5 cycles per degree. VEP components were the latencies of N1, P1, N135, and the amplitude of VEP. Results: Repeated measures of the ANOVA test showed that the effect of spatial frequency on latencies and amplitude of VEP was significant (P<0.001). Paired T-test showed that there was a significant difference between subjective visual acuity and extrapolation of visual acuity with VEP (P<0.001). Conclusion: According to the significant relationship between VEP amplitude and spatial frequencies of the visual stimuli obtained in this study, the Sweep VEP technique can be used as a valid and objective tool in the determination of visual acuity, especially in patients with low levels of cooperation.http://sjku.muk.ac.ir/article-1-6752-en.htmlamplitudelatencyspatial frequencyvisual acuityvisual evoked potentials. |
| spellingShingle | Monireh Mahjoob Javad Heravian The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment مجله علمی دانشگاه علوم پزشکی کردستان amplitude latency spatial frequency visual acuity visual evoked potentials. |
| title | The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment |
| title_full | The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment |
| title_fullStr | The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment |
| title_full_unstemmed | The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment |
| title_short | The Effect of Spatial Frequency on Visual Evoked Potentials Components in Visual Acuity Assessment |
| title_sort | effect of spatial frequency on visual evoked potentials components in visual acuity assessment |
| topic | amplitude latency spatial frequency visual acuity visual evoked potentials. |
| url | http://sjku.muk.ac.ir/article-1-6752-en.html |
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