Related Experiment Videos
Scanning laser ophthalmoscope-evoked multifocal-ERG (SLO-m-ERG) by using short m-sequences
G Rudolph1, P Kalpadakis, M Bechmann
1Eye Clinic, Ludwig-Maximilians-University, Munich, Germany. Guenther.Rudolph@ak-i.med.uni-muenchen.de
Purpose:
To demonstrate the possibility of topographic mapping of retinal function under simultaneous control of fixation in humans, by scanning laser ophthalmoscope evoked multifocal electroretinography (SLO-m-ERG).
Methods:
A confocal scanning laser ophthalmoscope was used as a stimulator and trigger unit to take m-ERGs. Short m-sequences based on a modified algorithm were used, with the advantage that each measurement cycle can be evaluated separately. We examined 78 normal subjects; in 62 a distortion factor of 1:1 was applied, and a factor of 1:4 in 16.
Results:
The recorded amplitudes decreased with eccentricity, approximately following the decrease of retinal cone density. Amplitudes were higher in the central hexagonal element in the group with 1:4 distortion than in the group with the 1:1 distortion setting.
Conclusions:
SLO-m-ERG is a reliable technique for topographic mapping of retinal function under simultaneous control of fixation.