Directed by Dr. Richard Weleber, the genetics services provides diagnostic evaluation, consultation, management and genetic counseling for patients with retinal degeneration and dystrophy or other genetic eye diseases. Evaluation may include visual, psychophysical and electrophysiological tests. Electrophysiologic testing is particularly helpful in diagnosing inherited retinal diseases, toxic drug exposure, and the presence of foreign bodies within the eye.
One of very few physicians board certified in both ophthalmology and genetics, Dr. Weleber is internationally renowned for his contributions to the field of ophthalmic genetics. He is one of very few ophthalmologists who is board certified in both ophthalmology and clinical genetics, and is internationally renowned for his contributions to the field of ophthalmic genetics. He is uniquely qualified to direct the Casey Eye Institute Ophthalmic Electrophysiology Service, which provides sophisticated diagnostic testing, including both full-field electroretinograms (ERGs) and multifocal ERGs, electro-oculography (EOG), visual evoked response (VER), dark adaptometry using the Goldmann-Weekers instrument, and special color vision testing (Farnsworth Panel D-15, Farnsworth-Munsell 100-Hue Test, and Nagel Anomaloscope testing). Dr. Weleber provides ophthalmic-genetic counseling and consultations.
For further information or to schedule an appointment, please call (503) 494-8386.
Also see the section on genetic research in our Macular Degeneration website.
Electrophysiologic Testing: Definitions
Electroretinography (ERG) measures the electrical response of the retina to flashes of light.
Electro-oculogram (EOG) measures the difference in the electrical potential between the front and back of the eye in response to dark and light.
Visual Evoked Response (VER) measures the electrical potential resulting from a visual stimulus.
Dark Adaptometry measures the period of time which passes before the retina regains its maximal sensitivity to low amounts of light when going from conditions of bright light to darkness. Dark adaptation is abnormal in some retinal diseases.
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