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Information for Physicians about the Baylor Visual Function Center



To return to our web site, please follow this link Baylor Visual Function Center at Dallas.


If you are a board certified ophthalmologist and are interested in using our ophthalmic laser equipment (Argon, YAG, SLT), please email, leave your phone number and contact information.  We will contact you to make arrangements.


For visual function testing and ophthalmic imaging, please call 214-820-2763 to make appointments.  Baylor Visual Function Center only accepts referrals from board certified physicians and surgeons.  For comments and complaints, email us at


We recommend ordering Electrophysiology and Imaging (OCT) in pairs because Electrophysiology measures the function of the visual system and Imaging (OCT) evaluates the structural changes in the eye, both of which are important for diagnosis.


The following is a list of Electrophysiology and Imaging (OCT) tests we offer for examining/diagnosing the following conditions:


  • Optic Neuritis/Neuropathy (ICD-9: 377.3)
  • Blurred Vision (ICD-9: 368.8)
  • Unexplained/Unspecified Visual Loss (ICD-9: 368.4)
  • Loss of Peripheral Vision (ICD-9: 368.4)
  • Night Blindness (ICD-9: 368.69)
  • Trauma (Injury) (ICD-9: 959.9)
  • Intracranial Hypertension/Pseudo Tumor (ICD-9: 348.2)
  • Retinal Nerve Fiber Bundle Defects (ICD-9: 362.85)
  • Brain Mass (non-malignant) (ICD-9: 362.16)
  • Malignant Neoplasm (Tumor) (ICD-9: 191.1)
  • Plaquenil Toxicity (ICD-9: v71.9)
  • Retinal Holes/Breaks (ICD-9: 361.31)
  • Long-term use of medication (ICD-9:v58.69)


Pattern VEPs (CPT 95930): Pattern VEPs is an objective test used to quantify the electroencephalographic activity in the visual cortex as recorded from the overlying scalp.  Pattern reversal is the preferred stimulus for visual evoked potentials recording because of its lower variability in waveform and timing compared to other methods.  The pattern VEPs measures the functional integrity of the entire visual pathway including the eye, retina, the optic nerve, optic radiations, and occipital cortex.  The visual pathway affected by diseases/conditions may show responses with reduced amplitude and/or delayed timing.  The Pattern VEPs evaluate visual transduction in the central 8-10 degrees of the visual field.


Flash VEPs (CPT95930): Flash VEPs may be useful for patients who are unable or unwilling to cooperate for pattern VEPs, and/or when optical factors such as media opacities prevent the valid use of pattern stimuli.


Multifocal ERG (CPT 92275): Multifocal ERG is an objective test used to quantify the central cone function in the retina in multiple locations simultaneously.  Retinal regions affected by diseases/conditions may show responses with reduced amplitude and/or delayed timing.  This ERG report presents individual response waveforms in 61 locations as well as summated waveforms in 5 concentric rings in the central 50 degrees of the retina.  The response amplitudes (Diff) are measured peak to peak from N1 to P1.


Full Field ERG (CPT 92275): Full Filed ERG is an objective test used to quantify the global rod and cone function in the retina.  The testing protocol used was designed by the International Society for Clinical Electrophysiology of Vision (ISCEV).  The Rod Response and Combined Rod-Cone response are recorded from dilated eyes after a 30 minute dark adaptation period without the presence of background light to eliminate rod contribution to the waveforms.  Retina affected by diseases/conditions may show responses with reduced amplitude and/or delayed timing.  Normative values are included in the report.


Visual Field Testing (CPT 92083): The automated perimetry exam is used for detection of blind spots.


OCT (Retina) (CPT 92134): Offer a high-resolution imaging of the retina.


OCT (Optic Nerve) (CPT 92133): Measures the thickness of the retinal nerve fiber layer and compares it to the normal range. 

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