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Updated: Aug 9, 2026
Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
Published on: May 12, 2019
[Visual evoked potentials in children with high blood lead level]
Dorota Pojda-Wilczek1, Ewa Herba, Barbara Schneiberg
1Z Katedry i Oddziału Klinicznego Okulistyki Slaskiej Akademii Medycznej Szpital Specjalistyczny nr 1 w Bytomiu.
Insights
Environmental lead exposure in children significantly delays visual evoked potential (VEP) P100 latency, particularly with blood lead levels over 150 microg/l. This suggests lead-induced neurological changes affecting vision.
Area of Science:
- Neuroscience
- Environmental Health
- Ophthalmology
Context:
- Environmental lead exposure is a significant public health concern, especially for children.
- Visual evoked potentials (VEP) are a non-invasive neurophysiological tool to assess the integrity of the visual pathway.
Purpose:
- To investigate the relationship between blood lead levels (Pb-B) and VEP parameters in children with environmental lead exposure.
- To determine if lead exposure affects visual pathway function in children without overt clinical signs of lead poisoning.
Summary:
- A study of 32 children (ages 2-15.5) with Pb-B ranging from 150-486 microg/l revealed significantly delayed P100 latency in VEP for those aged seven and above with Pb-B > 150 microg/l.
- While P100 amplitudes were not significantly different, abnormal VEP morphology was observed in some children.
- The findings indicate that elevated blood lead levels can lead to demyelination-like changes in the visual pathway.
Impact:
- This research highlights the subclinical neurotoxic effects of lead on the developing visual system.
- The results suggest that VEP can serve as a sensitive indicator of lead-induced neurotoxicity in children.
- Findings have implications for public health policies aimed at reducing lead exposure and protecting children's neurological development.
Purpose:
The aim of this study is to find the relationship between lead level in blood (Pb-B) and visual evoked potentials (VEP) in children, environmentally exposed to lead.
Material And Methods:
32 children (64 eyes) with no clinical signs of lead poisoning were examined. Corrected visual acuity was 5/5 in all eyes. Age of the children was 2-15.5 years (mean 8), Pb-B ranged from 150 to 486 (mean 262) microg/l. For pattern VEP LKC equipment, UTAS E-2000 program and stimulations of 13', 26', 52', 105' were used. P100 amplitude and latency were calculated.
Results:
P100 latency was significantly delayed in children at the age of seven, with Pb-B above 150 microg/l. The latencies were more delayed in children with higher than in lower Pb-B, but the relation was not linear. P100 amplitudes did not differ significantly from the control group. In some children VEP had abnormal morphology, double P100 peak or P100 without sharp, but extended peak.
Conclusion:
Delayed P100 PVEP latency occurred in children with blood lead level higher than 150 microg/l, after at least 7 years of environmental exposure. Changes in VEP are similar to those which are caused by demyelinization and are found in multiple sclerosis.
