Does anyone know any studies which used a 20 degree stimulus size for eliciting focal electroretinograms?

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Danjie Li

There is an instrument called the focal electrophysiologram. You can use it to measure the eye of any part, any range of retinal electrophysiological responses.

Artur Cideciyan

check out the following and the citations within: Nusinowitz S, Hood DC, Birch DG. Rod transduction parameters from the a wave of local receptor populations. J Opt Soc Am A Opt Image Sci Vis. 1995 Oct;12(10):2259-66.

J. Jason McAnany

In addition to Dr. Cideciyan’s excellent suggestion, I’d recommend reviewing work from Miyake’s group. For example: Miyake Y. Focal macular electroretinography. Nagoya J Med Sci. 1998 Oct;61(3-4):79-84. PMID: 9879190. His book “Electrodiagnosis of Retinal Diseases” also contains a review of focal ERG with several useful references.

Vittorio Porciatti

If you are interested in 10 deg focal ERG, then you might check the attached reprints.