July 1996
Volume 37, Issue 8
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Articles  |   July 1996
The relationship between visual field size and electroretinogram amplitude in retinitis pigmentosa.
Author Affiliations
  • M A Sandberg
    Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, USA.
  • C Weigel-DiFranco
    Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, USA.
  • B Rosner
    Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, USA.
  • E L Berson
    Berman-Gund Laboratory for the Study of Retinal Degenerations, Harvard Medical School, Massachusetts Eye and Ear Infirmary, Boston, USA.
Investigative Ophthalmology & Visual Science July 1996, Vol.37, 1693-1698. doi:
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    • Get Citation

      M A Sandberg, C Weigel-DiFranco, B Rosner, E L Berson; The relationship between visual field size and electroretinogram amplitude in retinitis pigmentosa.. Invest. Ophthalmol. Vis. Sci. 1996;37(8):1693-1698.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

PURPOSE: To determine to what degree visual field size is correlated with electroretinogram (ERG) amplitude among patients with the common forms of retinitis pigmentosa (RP). METHODS: Visual field equivalent diameter to the V4e white test light of the Goldmann perimeter was correlated with log ERG amplitude elicited by 0.5 Hz or 30 Hz full-field flashes of white light. Primary analyses were conducted on data from 583 patients with the common forms of RP. Subset analyses were performed on data from patients with ERG responses with different ranges of amplitude to assess to what extent the correlation depends on ERG amplitude, as well as on data from patients of a given genetic type to determine whether the correlation depends on the mode of transmission. Data from patients with the rhodopsin, Pro23His mutation (n = 38) or with the rhodopsin, Pro347Leu mutation (n = 24) were analyzed to determine the correlation between visual field size and ERG amplitude for patients with the same mutation. RESULTS: Visual field size was significantly correlated with ERG amplitude for every comparison (P < or = 0.0003). Correlations generally were higher for ERGs elicited by 30 Hz flashes (r = 0.62 for the entire sample) than they were for those elicited by 0.5 Hz flashes (r = 0.53 for the entire sample). They were lower for truncated ranges of ERG amplitude, higher for patients with dominant or recessive disease than for patients with x-linked disease or for patients of all genetic types combined, and strong for patients with the same rhodopsin mutation (reaching a value of 0.87). CONCLUSIONS: Visual field size is significantly correlated with ERG amplitude for patients with RP. Correlation depends on the range of ERG amplitudes, the inheritance type, and, particularly, on whether the analysis is confined to a single gene mutation.

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