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Visual evoked potentials in children with neurofibromatosis type 1.
Alessandro Iannaccone1, Richard A McCluney, Vickie R Brewer
1Department of Ophthalmology, University of Tennessee, Memphis 38163, USA. iannacca@mail.eye.utmem.edu
Documenta Ophthalmologica. Advances in Ophthalmology
|August 3, 2002
Summary
Visual evoked potential (VEP) abnormalities are common in children with neurofibromatosis type 1 (NF1), even without brain tumors. These VEP changes suggest primary visual processing issues in NF1, not solely due to unidentified bright objects (UBOs).
Area of Science:
- Neuroscience
- Ophthalmology
- Genetics
Background:
- Neurofibromatosis type 1 (NF1) is a genetic disorder.
- Optic pathway and brain tumors are known complications of NF1.
- Visual evoked potentials (VEPs) assess the visual pathway's function.
Purpose of the Study:
- Determine VEP abnormalities in children with NF1 without tumors.
- Investigate if unidentified bright objects (UBOs) explain VEP abnormalities in NF1.
- Explore primary visual processing deficits in NF1.
Main Methods:
- Recorded pattern-reversal and flash VEPs in 16 children with NF1 and 13 controls.
- Used multiple stimulus sizes and conditions (monocular, binocular, dark/light-adapted).
- Masked VEP and MRI (for UBOs) assessments were performed.
Main Results:
- 10 of 16 children with NF1 showed abnormal VEPs.
- Abnormalities included delayed responses and absent flash VEP components.
- UBOs were present in all NF1 children but did not fully explain VEP abnormalities.
Conclusions:
- VEP abnormalities occur in NF1 even without optic pathway or brain tumors.
- Findings suggest primary visual processing abnormalities in children with NF1.
- VEP testing is valuable for detecting visual pathway dysfunction in NF1.