These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Rod-driven focal macular electroretinogram.
    Author: Choshi T, Matsumoto CS, Nakatsuka K.
    Journal: Jpn J Ophthalmol; 2003; 47(4):356-61. PubMed ID: 12842203.
    Abstract:
    PURPOSE: To determine the stimulus conditions required to elicit rod-driven, focal macular electroretinograms (rod FMERGs). METHODS: A blue (lambda(max)=470 nm) stimulus, 5 degrees in size, was imaged at a luminance of 1.5 cd/m(2) on different regions of the human retina. Electroretinograms (ERGs) elicited by this stimulus were recorded from the light- and dark-adapted retina of four subjects without any ophthalmological abnormalities. A subject with cone dystrophy was also tested by this method. RESULTS: Stimulus luminance <==1.5 cd/m(2) did not elicit a response when it was imaged on the optic disc, but higher intensities elicited a small b-wave from stray light. When this stimulus was imaged on the macular area or the 15 degrees temporal retina, an ERG was elicited that had the shape of the full-field scotopic ERG. This stimulus with a luminance of 1.5 cd/m(2) did not elicit a response from stimulation of the macular area of a light-adapted retina but elicited a slow-rising positive b-wave after 30 minutes of dark adaptation. In a subject with cone dystrophy, focal rod response was elicited from the macula, despite no response under photopic conditions. CONCLUSION: We conclude that this stimulus will elicit a response that is derived exclusively from rods and is a focal response with no contribution from stray light.
    [Abstract] [Full Text] [Related] [New Search]