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Clinical Resources

visual electrophysiology

Konan’s EvokeDx is the most advanced electrodiagnostic device for use by eye care professionals I’ve ever seen.  The myriad of testing options allows for the quantification of aspects of visual performance beyond anything else on the market.  With more than 40 years using visual electrophysiology using many of the systems available, I really appreciate the new Fourier analytics methods of analyzing the data.  It took a short time to wrap my head around, but the reward has been enormous.

Additionally, the gaze tracking system allows continuous monitoring of the patient’s attention and the OLED screen with all its concordant benefits of clean stimuli and precise control of contrast is suburb.  EvokeDx is a winner!

Paul Harris, OD

Professor, Southern College of Optometry

Having incorporated VEP and ERG into my practice more than 5 years ago, I am convinced daily of the clinical benefits assessing glaucoma, retina, and many neuro-affected conditions. After switching from an earlier generation product, I am more confident with the test strategies, short run testing, Fourier frequency domain analytics, and ultimately improved clinical decisions (plus my techs will never go back to the old system!).

Craig Thomas, OD

First Eye Care Dallas

As a next generation VEP and ERG system, EvokeDx provides greater ease of use and acquisition, a sleek portable high-tech system, a precise assessment of the full visual pathway with specific testing capabilities for important M cell pathways that aid in the accuracy of a diagnosis.  The system is touch screen is easy for the staff and the valuable information or readouts provided makes it easy for the doctor to assess pathology.  Konan has become the “Mac” of ophthalmic technology and has once again done it with VEP and ERG testing.

Paul Karpecki, OD

Chief Clinical Editor, Review of Optometry, Director of Clinical Research, Koffler Vision Group

The EvokeDx system includes a range of tests based on scientific findings accrued over decades that have elucidated the neural origins of the electrophysiological responses elicited noninvasively from the visual system. The systems analysis approach used involves quantitative analysis of the entire responses (VEPs/ERGs) in the frequency domain and their relations to time-domain waveforms. Statistical methods applied to these measures enable determination of whether responses are present in the recordings and significance tests to compare responses from fellow eyes as well as changes over time associated with disease or treatments. These techniques have been employed successfully to characterize contributions to the responses from and the integrity of different pathways and mechanisms.

Vance Zemon, PhD

Co-inventor EvokeDx | Neucodia, Professor of Psychology, Ferkauf Graduate School Yeshiva University Albert Einstein College of Medicine

Accuracy of isolated-check visual evoked potential technique for diagnosing primary open angle glaucoma

Xu, L.J., Zhang, L., Li, S.L. et al. Doc Ophthalmol (2017). doi:10.1007/s10633-017-9598-6

Accuracy of isolated-check visual evoked potential technique for diagnosing primary open-angle glaucoma

Xu, L.J., Zhang, L., Li, S.L. et al. Doc Ophthalmol (2017). doi:10.1007/s10633-017-9598-6

A Multi-Site Study of an Electrophysiological Test for Rapid and Objective Assessment of Glaucomatous Damage

Zemon VM, Tsai JC, Netland PA, Gordon J, Hartmann EE, Salim S, Greenstein VC, Swanson MW, Naser NT, Boonyaleephan S, Hu G.
Novel electrophysiological instrument for rapid and objective assessment of magnocellular deficits associated with glaucoma

Novel electrophysiological instrument for rapid and objective assessment of magnocellular deficits associated with glaucoma

Zemon, Vance, et al. “Novel electrophysiological instrument for rapid and objective assessment of magnocellular deficits associated with glaucoma.” Documenta ophthalmologica 117.3 (2008): 233-243.

VEP Detection of Glaucomatous Visual Field Loss

VEP Detection of Glaucomatous Visual Field Loss

Tsai, J. “VEP Technology for the Detection of Glaucomatous Visual Field Loss.” Glaucoma Today. 3 (2009):  52-54.

Making Visual Evoked Potential Clinic-Friendly

Kent C. (2011). Making Visual Evoked Potential Clinic-Friendly. Review of Ophthalmology & Visual Science, 17(5), 83-88.
Utility of the Isolated-Check Visual Evoked Potential Technique as a Glaucoma Monitoring Device

Utility of the Isolated-Check Visual Evoked Potential Technique as a Glaucoma Monitoring Device

Nayak, N. V., Hu, G., Lin, J., & Tsai, J. C. (2011). Utility of the Isolated-Check Visual Evoked Potential Technique as a Glaucoma Monitoring Device. Investigative Ophthalmology & Visual Science52(14), 5480-5480.
Influence of pupil size and other test variables on visual function assessment using visual evoked potentials in normal subjects

Influence of pupil size and other test variables on visual function assessment using visual evoked potentials in normal subjects

Salim, S., Childers, K., Lupinacci, A. P., Hu, G. Z., Zemon, V., & Netland, P. A. (2010). Influence of pupil size and other test variables on visual function assessment using visual evoked potentials in normal subjects. Documenta ophthalmologica121(1), 1-7.

Visual Evoked Potential and Glaucoma management- A Review

Kirstein EM (2015) Visual Evoked Potential and Glaucoma management- A Review. Int J Ophthalmol Eye Res. S1:003, 10-13.

Visual evoked potential assessment of the effects of glaucoma on visual subsystems

Greenstein, Vivienne C., et al. “Visual evoked potential assessment of the effects of glaucoma on visual subsystems.” Vision research 38.12 (1998): 1901-1911.

A Short-Duration Visual Evoked Potential (VEP) Test Protocol

Zemon, Vance M., et al. “A Short-Duration Visual Evoked Potential (VEP) Test Protocol.”  Investigative Ophthalmology & Visual Science 53.14 (2012): 5719-5719.

Contrast Response Properties of Magnocellular and Parvocellular Pathways in Retinitis Pigments Assessed by the Visual Evoked Potential

Alexander, K. R., Rajagopalan, A. S., Seiple, W., Zemon, V. M., & Fishman, G. A. (2005). Contrast response properties of magnocellular and parvocellular pathways in retinitis pigmentosa assessed by the visual evoked potential. Investigative ophthalmology & visual science46(8), 2967.