1 January 2011 Optoelectrophysiological stimulation of the human eye using fundus-controlled silent substitution technique
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J. of Biomedical Optics, 16(1), 015002 (2011). doi:10.1117/1.3528616
Abstract
We design, characterize, and apply a novel optoelectrophysiological setup for a fundus-controlled silent substitution technique that accounts for interindividual variability in retina morphology and simultaneously monitors the stimulation site under investigation. We connect a digital color liquid crystal on silicon projector, an electron-multiplying imager, and a light-emitting diode to a fundus camera. The temporal and spatial characterization reveal a maximal contrast loss of 7% for the highest stimulation frequency (30 Hz) and maximum cutoff spatial frequencies of ∼120 cycles/deg. Two silent substitution flash sequences are applied to modulate selective activity in the short-wavelength-sensitive cone (S-cone) and combined long- and middle-wavelength-sensitive cone (LM-cone) pathways. Simultaneously, the visual evoked potentials are recorded. The data are compared to the grand average responses from a previous study that employed standard computer-screen presentation and showed very good latency matches. All the volunteers in the present examination exhibit differences between the S-cone and LM-cone evoked potentials (parameters mean values: peak-to-peak amplitude, N1 latency, and P1 latency for S-cone/LM-cone responses: 8 μV/15 μV, 113 ms/89 ms, 170 ms/143 ms). We demonstrate that the developed optoelectrophysiological setup simultaneously provides imaging, functional stimulation, and electrophysiological investigation of the retina.
Sascha Klee, Dietmar Link, Patrick Bessler, Jens Haueisen, "Optoelectrophysiological stimulation of the human eye using fundus-controlled silent substitution technique," Journal of Biomedical Optics 16(1), 015002 (1 January 2011). http://dx.doi.org/10.1117/1.3528616
Submission: Received ; Accepted
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KEYWORDS
Liquid crystal on silicon

Projection systems

Cameras

Retina

Imaging systems

Eye

Cones

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