360-455-4425 doc@rouseeyecare.com  8160 Freedom Ln. NE Suite D Lacey, WA, 98516  

Ophthalmic Electrophysiology

Electrophysiology testing with the Diagnosys instrument includes a battery of tests which can be used to provide information about the visual system beyond the standard clinical examination of the eye. Electroretinography (ERG), Visual Evoked Potentials (VEP), and Photopic Negative Response (PhNR) are three of the tests conducted in the Ophthalmic Electrophysiology Laboratory. The primary objective of the electrophysiologic examination is to assess the function of the visual pathway from the photoreceptors of the retina to the visual cortex of the brain. Information obtained from these diagnostic tests helps establish the correct diagnosis or may rule out related ophthalmic diseases.

Electrophysiologic testing is useful in diagnosing a variety of inherited or acquired retinal and optic nerve diseases, toxic drug exposure, inflammatory conditions, intraocular foreign bodies, retinal vascular occlusions, and an unknown cause of visual loss. Electrophysiologic testing is performed most often in large referral centers which have expertise in obtaining and interpreting these data. The data are used in conjunction with the clinical examination and other tests (Perimetry, OCT, Pupillography, Dark Adaptometry) to establish a correct diagnosis.


The Electrophysiology Service at ROUSE EyeCARE CENTER specializes in:

  • Multifocal electroretinography (mfERG or mERG)
  • Pattern Visual Evoked Potentials (PVEP)
  • Photopic Negative Response (PhNR)
  • Flash Visual Evoked Potentials (Flash VEP)
  • Scotopic Full-Field ERG
  • Photopic Full-Field ERG

Call us today or visit our appointment request page to find a time that is convenient for you to see Dr. Craig Rouse!