Sign Up for a Free Account

This is an image preview.
Start a Free Account
to view the full image.

  • Nearly 3,000 illustrations, including video clips of neurologic disorders.

  • Every article is reviewed by our esteemed Editorial Board for accuracy and currency.

  • Full spectrum of neurology in 1,200 comprehensive articles.

  • Listen to MedLink on the go with Audio versions of each article.

Multifocal electroretinogram (1)

Full-field electroretinogram (ERG) is not sensitive for detection of local change of retinal function because of the mass response from the entire retina. Full-field ERG abnormalities are seen with advanced or extensive disease. Multifocal ERG tests locally with focal stimulation using stimulus patterns 61-241 hexagons. (Contributed by Dr. Rosa Ana Tang.)