AN ASSESSMENT OF THE VARIATION OF THE LATENCY AND AMPLITUDE OF PATTERN REVERSED VEP RESULTED FROM THE BLURRED VISION DUE TO THE MYOPIA

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HASHEMI MALAYERI B.; FIROUZABADI S.M.; YOUSEFI S.; JAFARZADEHPOUR E.

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Journal: DANESHVAR MEDICINE Year:2005 | Volume:12 | Issue:57 Page(s): 69-76

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Title

AN ASSESSMENT OF THE VARIATION OF THE LATENCY AND AMPLITUDE OF PATTERN REVERSED VEP RESULTED FROM THE BLURRED VISION DUE TO THE MYOPIA

Author(s)

HASHEMI MALAYERI B. | FIROUZABADI S.M. | YOUSEFI S. | JAFARZADEHPOUR E. | Issue Writer Certificate

Keywords

VISUAL EVOKED POTENTIAL (VEP)Q3

PATTERN REVERSAL STIMULATIONQ4

ACUITYQ3

MYOPIAQ3

Abstract

Introduction: Over the past century, the Visual Evoked Potential (VEP) has gained widespread applications in vision research and clinical ophthalmology. The VEP helps us in the prognosis and distinctive diagnosis of eye diseases. Different parameters affect VEP, such as blurred and low ACUITY of the vision due to the eyes refractive errors which specially result from the MYOPIA. In this study, the effect of MYOPIA on the variation of the latency and amplitude of the P100 peak of the VEP has been investigated. Materials and Methods: Using various stimulation patterns, including the checker boards, vertical and horizontal bars, at two angles of 10 and 43 minutes, the effect of visual ACUITY, at four levels of 20/20, 20/40, 20/80, and 20/20, on the P100 peak of the VEP was investigated. Therefore, VEP signal was recorded by a Nicolet 1015 model machine and the different levels of visual acuities, as mentioned above, were induced by using suitable spherical lenses on a few normal and healthy volunteer individuals. Results: The results indicate that using the checker board patterns at small visual angel (10 minutes) shows the variation in the P100 parameter of the VEP better. It was also noted that, in this situation, by reducing the visual ACUITY the latency of the VEP is increased, while its amplitude is decreased significantly. Conclusion: In spite of the results obtained in this study, there is not a statistically significant quantitative relation between the visual ACUITY and the latency and amplitude of the P100 VEP peak that can be validated and relied on for diagnostic purposes. However, there are some variations. More accurate and detailed results on this topic needs further research on a bigger sample of individuals.

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APA: Copy

HASHEMI MALAYERI, B., FIROUZABADI, S.M., YOUSEFI, S., & JAFARZADEHPOUR, E.. (2005). AN ASSESSMENT OF THE VARIATION OF THE LATENCY AND AMPLITUDE OF PATTERN REVERSED VEP RESULTED FROM THE BLURRED VISION DUE TO THE MYOPIA. DANESHVAR MEDICINE, 12(57), 69-76. SID. https://sid.ir/paper/30732/en

Vancouver: Copy

HASHEMI MALAYERI B., FIROUZABADI S.M., YOUSEFI S., JAFARZADEHPOUR E.. AN ASSESSMENT OF THE VARIATION OF THE LATENCY AND AMPLITUDE OF PATTERN REVERSED VEP RESULTED FROM THE BLURRED VISION DUE TO THE MYOPIA. DANESHVAR MEDICINE[Internet]. 2005;12(57):69-76. Available from: https://sid.ir/paper/30732/en

IEEE: Copy

B. HASHEMI MALAYERI, S.M. FIROUZABADI, S. YOUSEFI, and E. JAFARZADEHPOUR, “AN ASSESSMENT OF THE VARIATION OF THE LATENCY AND AMPLITUDE OF PATTERN REVERSED VEP RESULTED FROM THE BLURRED VISION DUE TO THE MYOPIA,” DANESHVAR MEDICINE, vol. 12, no. 57, pp. 69–76, 2005, [Online]. Available: https://sid.ir/paper/30732/en

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