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A full-field electroretinogram measures the electrical signals produced by the retina when exposed to flashes of light. It evaluates the function of rods and cones across the entire retina. Doctors use it to diagnose inherited conditions, monitor disease progression, and check responses to treatment. The test offers information that cannot be gained from images alone. It is important for understanding global retinal behavior.
read more about full field erg ...The eyes adjust to dark and light settings before the test begins. Special contact lenses or skin electrodes record electrical activity when light flashes occur. Each flash triggers a signal that reflects how well retinal cells respond. These recordings show patterns of strength and timing. The session is controlled and safe.
Common reasons include:
Results reveal whether retinal cells produce strong, weak, or delayed responses. Abnormal patterns guide further testing or treatment discussions. The test helps separate retinal causes from nerve-related causes of vision loss. Consistent monitoring offers a clear view of changes over time. It is widely trusted in retinal evaluation.
A full-field ERG measures how the retina responds to light flashes by recording tiny electrical signals from retinal cells. The test often includes time in dark and light conditions so rods and cones can be assessed separately. Electrodes placed on the skin or a special contact lens pick up the signals while the patient watches the flashes. Doctors review the size and timing of the responses to see if activity looks strong, weak, or delayed. This helps clarify whether symptoms tie back to widespread retinal function rather than a problem seen only on photos.
Most people feel mild pressure from the lens or electrode but no pain.
They trigger retinal activity needed for the recordings.
Yes, with preparation, the test is safe for children.
Drops used during the test support accurate readings.
Electroretinogram. EyeWiki. https://eyewiki.org/Electroretinogram. Accessed March 20, 2026.
LCD - Electroretinography (ERG) (L37371). American Academy of Ophthalmology. https://www.aao.org/Assets/3a9bd3f2-5017-4bd8-93a1-1706f02aa57a/636861745402600000/novitas-l37371-erg-updated-02082019-effective-01012019-pdf?inline=1%2F1000. Accessed March 20, 2026.
Guidelines on Clinical Assessment of Patients with Inherited Retinal Degenerations. American Academy of Ophthalmology. https://www.aao.org/education/clinical-statement/guidelines-on-clinical-assessment-of-patients-with. Accessed March 20, 2026.
Treatment for Retinitis Pigmentosa Reported. National Eye Institute - NIH. https://www.nei.nih.gov/research-and-training/research-news/treatment-retinitis-pigmentosa-reported. Accessed March 20, 2026.
Retinitis Pigmentosa. EyeWiki. https://eyewiki.org/Retinitis_Pigmentosa. Accessed March 20, 2026.