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Retinal Gene Therapy Once Again Utilizes FST Testing

DiagnosysFST continues to be an important diagnostic tool to quantitatively evaluate the efficacy of breakthrough gene therapies for inherited retinal...Read More

ERG for Children

Discover the abridged ERG for children Full-field ERG is a pivotal diagnostic tool for detecting generalized retinal dysfunction and identifying...Read More

E3 System on the International Space Station

Diagnosys E3 Ophthalmic Electrophysiology System Begins its use on the International Space Station Research on changes to the eye and...Read More

The Full-field Sensitivity Threshold (FST) for Ophthalmic Diagnosis

What is the FST? The FST is a psychophysical test with distinct advantages over other tests for quantifying vision in...Read More

Chiasmal Coefficient

Chiasmal Coefficient Calculator with a 3-Channel VEP The Chiasmal Calculator is a tool that can calculate optic nerve misrouting with...Read More

S-Cone ERG

S-Cone ERG The short-wavelength cone (S-Cone) protocol tests the blue-light receptor retinal pathway. This test can be useful for diagnosing...Read More

Photopic Negative ERG (PhNR)

Photopic Negative ERG (PhNR) A Photopic Negative Response (PhNR) is a test of generalized retinal ganglion cell health and function....Read More

Dark-adapted red flash ERG

DA Red Flash ERG The dark-adapted red flash is an extension of the standard full-field ERG. It incorporates a dim...Read More

On-Off ERG

On-Off ERG The On-Off ERG is a separate protocol used to investigate post-phototransduction or post-receptor dysfunction. This protocol elicits a...Read More

Pattern ERG (pERG)

Pattern ERG (PERG) The Pattern ERG (pERG) produces a macular retinal ganglion cell response. When done as a follow-up to...Read More


  • 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

  • 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

  • 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