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S-Cone ERG

The short-wavelength cone (S-Cone) protocol tests the blue-light receptor retinal pathway. This test can be useful for diagnosing inherited retinal disorders and distinguishing between rod monochromacy and S-cone monochromacy.     The S-Cone protocol can be run on a ColorDome stimulator that delivers flashes of blue light on an amber-colored background. The background light serves to […]

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Photopic Negative ERG (PhNR)

A Photopic Negative Response (PhNR) is a test of generalized retinal ganglion cell health and function. Reduced PhNR amplitudes might be indicators for: glaucoma, optic atrophy, central retinal artery occlusion, ischemic optic neuropathy, diabetic retinopathy, or idiopathic intracranial hypertension.     This protocol uses a low intensity red flash on a rod-saturating blue background. It can […]

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Dark-adapted red flash ERG

The dark-adapted red flash is an extension of the standard full-field ERG. It incorporates a dim red flash of light which elicits an x-wave that illuminates further detail of the rod pathway physiology.     This protocol can be used in the diagnosis of achromatopsia (rod monochromacy), cone dystrophy, and other cone system dysfunctions. They are […]

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On-Off ERG

The On-Off ERG is a separate protocol used to investigate post-phototransduction or post-receptor dysfunction. This protocol elicits a response from the bipolar and inter-retinal cells. ISCEV indicates that his protocol may further reveal details about: CSNB, melanoma-associated retinopathy, and some forms of autoimmune retinopathy. This protocol may also be useful in X-linked retinoschisis, Batten disease, […]

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Pattern ERG (pERG)

The Pattern ERG (pERG) produces a macular retinal ganglion cell response. When done as a follow-up to an abnormal pattern VEP, the pERG can elucidate whether the abnormality is caused by retinal or optic nerve dysfunction. This test may also assist in diagnosing glaucoma, optic neuropathies, and primary ganglion cell diseases.     A pERG can […]

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References

Diagnosys equipment is capable of performing the following protocols: Full field ERG (ffERG), Multifocal ERG (mfERG), Pattern ERG (PERG), Photopic Negative Response (PhNR), Pattern VEP, Flash VEP, Stepwise Sweep VEP, Electro-oculogram (EOG), and Electrically Evoked Response (EER) tests. The resulting size, shape, and delay of various components of the response waveforms are indicators evaluated by […]

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Software Version V6.64 Release

Software Version V6.64.14 released on June 28, 2021   New Features and Bug Fixes: ColorFlash ColorFlash protocols now include the ability to flicker by holding the trigger. Releasing the trigger ends the flicker Multifocal Fixed infinite spawning of tabs in the multifocal display FST Enhancements New parameters added to the setup tab that allow adjustment […]

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Sweep VEP

Sweep VEP is an objective method to estimate a person’s visual acuity. This test is useful for patients with unexplained vision loss or any adult / child who is unwilling or unable to perform a subjective acuity test.     How it works   Similar to a 3-channel VEP, Sweep VEP utilizes three active scalp electrodes: […]

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Multifocal ERG (mfERG)

  The Multifocal ERG (mfERG) test shows visual function across the macula. This test divides the macula into multiple hexagonal regions. The stimulus is a pseudo-random sequence of black and white hexagons that alternate many times per second. A standard ERG electrode setup is used to record the signal, and mathematical extraction is used to […]

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Visually Evoked Potentials (VEP)

Visually Evoked Potentials (VEPs) are used to investigate conduction along the visual pathway. They may be used to quantify and follow progression of nerve pathology, localize lesions and measure slow –downs for multiple reasons such as: compression, inflammation, demyelination, or trauma.  A VEP is recorded using a scalp electrode(s) placed over the occipital lobe of […]

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Testimonials

  • I have used Diagnosys electrophysiology systems for clinical testing and research for nearly fifteen years. The systems are reliable, easy to use and protocols readily modified to answer research questions. The few times I have had problems with the equipment, Diagnosys has quickly responded and fixed the problem.

    Ron Hansen

    PhD
  • Diagnosys LLC not only provides high quality testing equipment, but also provides excellent customer support services. All employees are knowledgeable in the field of visual electrophysiology and are able to help with any questions or issues you may have.

    Julie Racine

    PhD
  • As a clinical neurophysiologist in a busy pediatric clinic, I wholeheartedly believe that the equipment made available to us by Diagnosys LLC allows for the testing necessary to aid in clinical diagnostics and research. I have always felt that this family run company has been by my side each and every step of the way, despite being located in another country.

    Dr. Allison Dorfman

  • Celeris is the Luxury Vehicle of Electrophysiology! I love Celeris for the vision science field because it grants all investigators access to a wide variety of electrophysiological tests without requiring in depth expertise of the theory of electrophysiology. It's wonderfully simple and easy to operate.

    Barbara A. Mysona

    PhD