Specialized Testing

Specialized Testing

The specialty testing center here at the UC Davis Health System Eye Center is equipped to serve the growing needs of the region. Our lab is equipped with the latest equipment and is staffed by Certified Ophthalmic Technicians skilled at performing the latest tests in measuring visual function.

•    EOG (Electro-oculogram), which measures the difference in the electrical potential between the front and the back of the eye in response to periods of dark and light.

•    ERG (Electroretinogram) is a test used to detect abnormal function of the retina. Specifically, in this test, the light sensitive cells of the eye, the rods and cones, and their connecting cells in the retina are examined.

•    MfERG (Multifocal electroretinogram) is much like the standard ERG in that it is testing the retina. The difference is that the multifocal ERG focuses on different areas of the retina, looking for localized areas of abnormality.

•    Microperimetry tests macular function, sensitivity and fixation stability with a confocal scanning laser ophthalmoscope (SLO) using real time tracking and a 4-2 threshold perimetry. We can precisely measure and monitor functional changes compared to an age-related database. This permits the differentiation of normal age-related loss of macular sensitivity from pathological changes that require treatment.

•    Visual Field (Static and Kinetic) automated perimetry, systematically plots the field of vision. The specialist then compares the data with age-correlated  normal data and interprets the results.   We also have the capability of performing Goldmann kinetic visual field testing which is mostly used for patients with low vision.

We accept referrals for these services and can provide test results in approximately 2 weeks.

If you are scheduled for one of the above testing services, please see below for patient instructions.  If you require more information, click the ‘Make an Appointment’ link to the right of this page and contact us.

Patient instructions for Electrophysiology Testing

EOG(electro-oculogram):
Please refrain from applying make-up or heavy face cream around the eyes and forehead, as it will be removed prior to the testing. You will not be dilated for this test. Patient must be age 12 or older. This test takes approximately 1 hour.

ERG(electroretinogram):
Your eyes will be dilated for this test. If you are concerned about driving home after dilation, please arrange to have someone drive you. Please refrain from applying make-up or heavy face cream around the eyes and forehead, as it will be removed prior to the testing.  This test takes approximately 1 hour.

MfERG(multifocal electroretinogram):
Your eyes will be dilated for this test. If you are concerned about driving home after dilation, please arrange to have someone drive you. Please refrain from applying make-up or heavy face cream around the eyes and forehead, as it will be removed prior to the testing. This test takes approximately 1 hour.

Referring physician will receive test results in approximately 2 weeks.

*We cannot perform these tests on patients with Seizure Disorders.