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Electrodiagnostic Services (ERG)

Call Us 623.537.6000
  • Mon, Wed, Fri: 8am-5pm
  • Tue, Thu: 9am-6pm

Electrodiagnostic testing is a specialized eye test which measures the electrical response of the light sensitive cells in the back of the eye. The Midwestern University Eye Institute houses the latest technology and equipment to serve all patients, from simple cases to complex. The equipment available for referring doctors includes a full field electroretinogram (ERG), a multifocal electroretinogram (mfERG), pattern electroretinogram (PERG), visually evoked potential (VEP) and electrooculogram (EOG). For many of these procedures, Midwestern University is one of the few resources available in the Phoenix Valley.

How We Can Help:

Electrodiagnostic services can help you if you have been diagnosed with unexplained vision loss, hereditary eye disorders, or toxicity from certain medications that alter vision such as hydroxychloroquine (plaquenil).  The machines used can diagnose eye problems that may be difficult to diagnose with other clinical methods.

What to Expect:

If you are referred for electrodiagnostic testing, you should anticipate a lengthy visit (~3-4 hours) due to the complexity of testing. In most circumstances, you will have your eyes dilated. For many of the tests, a specialized type of contact lens will be placed on the eye to help measure the electrical response of the eye. The doctor will place the contact lens on your eye so you do not need to be a contact lens wearer to have electrodiagnostic testing. If you are referred for electrodiagnostic testing by another provider, it is important that all of your records be sent for review prior to the appointment. You will be examined by a team of students and doctor. In addition to the electrodiagnostic testing, you will most likely undergo additional testing to aid in assessment. In most instances, the evaluation will be billed to your medical insurance rather than to vision insurance.

Clinic Contact Information:

For an electrodiagnostics evaluation, please contact 623-537-6000, option 2.

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What To Expect

Reasons to Refer To Us

State-of-the-art technology.

At the Midwestern University Clinics, we stay up to date on the newest technology and research.

Complete electronic reports.
The Electrodiagnostic Clinic at the Eye Institute gives the referring doctor a full report, including waveforms and interpretations.

High standards of care.
We strive to provide the highest quality of care through detailed evaluations for all our patients.

University learning environment.
Our students work under faculty supervision to enhance classroom learning from doctors who demonstrate positive interactions with patients.

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