Electro-Retinography (ERG) / Electro-oculography (EOG) is used to measure the electrical responses of various cell types in the retina, including the light-sensitive cells (rods and cones) and the ganglion cells.
The ERG / EOG is used for the diagnosis of various retinal diseases :
- Retinitis Pigmentosa and related hereditary degenerations
- Leber’s Congenital Amaurosis
- Gyrate Atrophy of the Retina and Choroid
- Goldman-Favre Syndrome
- Congenital Stationary Night Blindness
- X-linked Juvenile Retinoschisis
- Cone Dystrophies
The multifocal ERG is used to record separate response for different retinal locations
Visual Evoked Potential (VEP) is useful for the diagnosis of :
- Optic Nerve disorders
- Unexplained Visual Loss
- Detecting Blindness in patients that cannot communicate such as babies or unconscious patients.