Compared with full-field ERG, multifocal ERG mainly provides information about what?

Compared with full-field ERG, multifocal ERG mainly provides information about what?

• A. Local retinal function information
• B. Color vision information
• C. Global retinal function
• D. Optic nerve responses

Answer: (A)

Multifocal ERG is designed to map retinal function across many small regions, giving a topographic picture of how different parts of the retina are working. Unlike full-field ERG, which stimulates the entire retina at once and yields a single global response reflecting overall retinal function, multifocal ERG isolates responses from localized areas. This makes it especially useful for detecting localized dysfunction, such as macular or localized retinal diseases, by providing local retinal function information. Color vision is not what this test primarily measures, and the ERG assesses retinal activity rather than optic nerve responses (which would be evaluated by visual-evoked potentials).

Multifocal ERG is designed to map retinal function across many small regions, giving a topographic picture of how different parts of the retina are working. Unlike full-field ERG, which stimulates the entire retina at once and yields a single global response reflecting overall retinal function, multifocal ERG isolates responses from localized areas. This makes it especially useful for detecting localized dysfunction, such as macular or localized retinal diseases, by providing local retinal function information. Color vision is not what this test primarily measures, and the ERG assesses retinal activity rather than optic nerve responses (which would be evaluated by visual-evoked potentials).