Simultaneous macular and paramacular ERGs recorded by standard techniques

B. Bagolini, V. Porciatti, B. Falsini, M. Neroni, G. Moretti

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


A technique for the simultaneous recording of two small-field electroretinograms (ERGs), macular and paramacular, employing standard apparatuses for stimulation and analysis is described. The stimuli consisted of two adjacent checks (6 deg/side) obtained by masking the display of a commercially available TV pattern stimulator. The checks were square-wave-modulated in counterphase at 3.12 Hz. The subjects fixated the center of one of two checks. In one stimulus cycle, two ERGs could be distinguished: one from the macular area and the other from the adjacent area. The macular ERG is about twice as large as the paramacular. ERGs recorded by this technique can be considered focal since (i) they show a sharp fall-off in amplitude when the stimulus is displaced from the fovea, and (ii) they are no longer recordable when the stimulus is centered on the optic disk or on a large macular scar.

Original languageEnglish (US)
Pages (from-to)343-348
Number of pages6
JournalDocumenta Ophthalmologica
Issue number3
StatePublished - Mar 1987
Externally publishedYes


  • focal electroretinogram
  • macular disease
  • stray light
  • Ulbricht effect

ASJC Scopus subject areas

  • Ophthalmology


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