Perform visual electrophysiology tests in the field
Measuring less than 4 inches and weighing less than one pound, the Envoy is the ideal portable pattern stimulator. Use Envoy to make measurements in the field. Perform pattern electroretinography (PERG), pattern visual evoked potential VEP (pVEP) or 19-hexagon multifocal electroretinography (mfERG).
Distinguish between maculopathy and optic neuropathy with one stimulator
Using PERG tests, detect and monitor the progression of retinal diseases, or the effectiveness of related therapies, affecting retinal ganglion cells (RGC) and the macula. Measure the progression of diseases or the effectiveness of therapies related to glaucoma and diabetic retinopathy.
Using pVEP tests, detect and monitor the health and functional integrity of central vision. Probe all levels of the visual pathway including the eye, retina, the optic nerve, optic radiation, and the occipital cortex. Evaluate optic nerve atrophy, ischemic optic neuropathy, papilledema, optic neuritis, and multiple sclerosis.
Perform ISCEV standard tests of retinal function
Both PERG and pVEP are objective visual electrophysiology tests defined by the International Society of Clinical Electrophysiology and Vision (ISCEV) standards.
If you are a researcher, Envoy supports custom PERG protocols. These include horizontal bars and larger field sizes, and custom pVEP, including multiple contrast levels and larger field sizes. Additionally, Envoy supports hemi-field and quadrant patterns, and specialized tests such as pattern onset VEP.
A high-performance and versatile portable pattern stimulator
The Envoy features a high-resolution OLED SVGA monitor. This portable pattern stimulator comes with a calibrated luminance of greater than 500 cd/m2 and contrast ratio exceeding 300:1. Obtain high-quality results with this artifact-free display and its response time of less than 1 ms. Use it as a handheld or set it up in minutes on an extendable arm for mounting on a desktop or cart.
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