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Visual Physiology Service

The Visual Physiology Service

Phone: 410-955-3560

The Visual Physiology Service at the Wilmer Eye Institute performs special tests to diagnose night blindness, color vision disorders, hereditary retinal disorders and other diseases. Often,these diseases cannot be diagnosed during routine examinations or require additional studies for the ophthalmologist to determine the correct diagnosis. For example, two tests, electroretinography (ERG) and electrooculography (EOG), help determine the extent of overall damage, the layers of retina that are damaged, and the amount of damage to these areas.

The visual evoked cortical potential (VECP) measures the electrical response of the visual cortex - the site where the brain turns nerve impulses into vision - when the retina is stimulated. This helps physicians evaluate how well the entire visual system is working, from the cornea at the front of the eye to the visual cortex at the back of the brain.

In addition, the scanning laser ophthalmoscope (SLO) is used to diagnose diseases affecting the macula, the part of the retina that is used for reading and other fine visual tasks. Using the SLO, an ophthalmologist can find the exact locations of "blind spots" in the macula that interfere with vision and can better teach patients how to use their remaining seeing retina more effectively.

Typical Conditions Seen:

Services Provided:

  • Comprehensive consultation and evaluation
  • Electroretinograms (ERG, multifocal ERG)
  • Electro-oculograms (EOG)
  • Visual Evoked Responses (VEP)
  • Color vision testing--D15, FM 100 Hue, Dark adaptated perimetry,
  • Scanning laser ophthalmoscope macular perimetry and imaging,
  • Contrast Sensitivity


Dr. Sheila West on the Link Between Smoking and Eye Disease in Women - 7/23/2014

Dr. Pradeep Ramulu and Colleagues Study Relationship Between Vision Loss and Work Status - 7/18/2014

Wilmer Resident Receives Lindstrom Research Grant - 7/11/2014

Four Wilmer Researchers Receive BrightFocus Foundation Awards - 7/10/2014

Dr. Michael Repka Part of Team Researching Telemedicine and ROP - 6/27/2014

Dr. M. Valeria Canto-Soler and Colleagues Featured on WBAL-TV - 6/24/2014

Dr. M. Valeria Canto-Soler and Colleagues Use Human Stem Cells to Create Light-Sensitive Retina in a Dish - 6/10/2014

Wilmer's Division of Ocular Immunology Announces "Living With Uveitis" Support Group - 6/10/2014

Dr. Neil Bressler to Speak on Diabetic Retinopathy at National Eye Health Summit and Webcast - 6/10/2014

Dr. Donald Zack Receives a Research to Prevent Blindness Nelson Trust Award for Retinitis Pigmentosa - 6/9/2014

Dr. Michael Boland Leads Study on Effectiveness of Automated Telecommunication-Based Reminders on Adherence to Glaucoma Medication Dosing - 6/4/2014

Dr. Christina Prescott Discusses Summer Eye Protection on Fox 45 News - 6/1/2014

Dr. Jonathan Song Discusses Treatment Options for Pediatric Cataracts - 5/23/2014

Johns Hopkins' Jordan Green Discusses His Work at Wilmer's Translational Tissue Engineering Center - 5/21/2014

Longtime Wilmer Employee Lillie Alston Honored by Hopkins - 5/19/2014

Dr. Richard Semba: Diets Rich in Antioxidant Resveratrol Fail to Reduce Deaths, Heart Disease or Cancer - 5/12/2014

Dr. Neil Miller Explains Eye Twitching in The Wall Street Journal - 5/12/2014

Dr. Hendrik Scholl Receives ARVO Award - 5/7/2014


Traveling for care?

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Whether crossing the country or the globe, we make it easy to access world-class care at Johns Hopkins.

U.S. 1-410-464-6713 (toll free)
International +1-410-614-6424



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