Özet:

ABSTRACT Introduction: Electroretinography (ERG) and Visual Evoked Potentials (VEP) are important diagnostic tests that measure the electrical activity occurring in the retina and the occipital cortex after visual stimuli and assess the visual pathways objectively. Xenon or Light Emitting Diode (LED) light sources could be used to generate the potential. A few studies comparing VEP measurements using these two light sources that have different physical features have found similar or slightly lower amplitudes when using LED as a light source instead of xenon bulb. However, no previous studies compared both ERG and VEP measurements using these two light sources simultaneously. The present study aimed to compare both ERG and VEP measurements using LED or Xenon as light source in a healthy population.   Materials and Methods: The study sample comprised of 31 healthy volunteers aged between 21 and 30 years. ERG and VEP measurements have been recorded from both eyes using LED or xenon light sources in a random order. Latencies and amplitudes of "a" and "b" waves in ERG and N2 and P2 waves in VEP measurements were compared using "Paired T-Test."   Results: No differences have been found between latencies of "a" and "b" waves in ERG and N2 and P2 waves in VEP measurements. Amplitudes of "a" and "b" waves in ERG and N2 wave in VEP measurements have been found lower in records taken using LED as a light source. Discussion and Conclusion: Highly similar wave morphology and results have been found using Xenon and LED light sources in ERG and VEP measurements.  Different suggestions such as using monochromatic LED or specific goggles have been made to increase the amplitudes in ERG and VEP measurements using LED light source. Moreover, the results of the present study need to be replicated in different age groups and populations that have visual pathway pathologies.

Anahtar Kelimeler: