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Application: |
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The clinical electrophysiologic testing of vision is intended for objective assessment of visual pathway starting from retina to cortex: |
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electroretinography (ERG) — recording of electrical activity of retina (electroretinogram) generated in response to the light stimulus; |
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visual evoked potentials (VEP) — study of the electrophysiological signals extracted from the electroencephalographic activity in the visual cortex recorded from the overlying scalp; |
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electro-oculography (EOG) — recording of changes in electrical potential across the retinal pigment epithelium recorded during successive periods of light and dark adaptations. |
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These tests allow: |
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diagnosing the disorders of retina and optic nerve at early stages; |
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diagnosing the congenital blindness in infants within first few months; |
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studying the retina at different disorders: perform diagnostics, make prognosis and control |
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the pathological processes in it; |
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estimating the degree of visual function impairment at visual cortex level; |
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assessing the reversibility of changes in visual pathway required to perform target treatment. |
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Neuro-ERG digital ERG system allows performing the following tests: |
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rod ERG; |
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maximal ERG; |
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cone ERG; |
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pattern ERG (PERG); |
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focal ERG; |
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flicker ERG; |
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оn/оff ERG; |
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oscillatory potentials; |
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multifocal ERG; |
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flash or pattern-reversal VEP; |
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steady-state VEP; |
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electro-oculography. |
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Robust Amplifier and Stimulator with Advanced Parameters |
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The high sampling rate and A/D converter resolution, wide bandpass and up to 100 Hz stimulation frequency allow obtaining the traces of premium quality. |
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Mini-ganzfeld Stimulator and Penlights with Concentrators |
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The mini-ganzfeld stimulator intended to perform the main tests (cone ERG, rod ERG, flicker ERG, oscillatory potentials) complies with the ISCEV standard requirements. |
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Such tests as focal ERG or cone ERG elicited by different colour flash stimuli are done with penlights with concentrators (red, blue, green, white). They are fixed on a special holder ensuring secure stimulator fixation near the pupil. |
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Set of Specially Designed Electrodes |
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The set of ERG electrodes specially designed with the assistance of A.M. Shamshinova (Helmholtz Moscow Research Institute of Eye Diseases, Russia) is supplied with the device. |
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The electrodes are constructed in the form of small “hooks” and “loops”. The electrodes of such shape do not cause the unpleasant feelings in a patient during the test and are very convenient for use in comparison with the contact-lens electrodes. |
