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 […]
Read MorePhotopic 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 […]
Read MoreDark-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 […]
Read MoreOn-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, […]
Read MorePattern 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 […]
Read MoreReferences
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 […]
Read MoreSoftware 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 […]
Read MoreSweep 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: […]
Read MoreMultifocal 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 […]
Read MoreVisually 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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