March 1993
Volume 34, Issue 3
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Articles  |   March 1993
Focal macular electroretinogram in X-linked congenital retinoschisis.
Author Affiliations
  • Y Miyake
    Department of Ophthalmology, Nagoya University School of Medicine, Japan.
  • N Shiroyama
    Department of Ophthalmology, Nagoya University School of Medicine, Japan.
  • I Ota
    Department of Ophthalmology, Nagoya University School of Medicine, Japan.
  • M Horiguchi
    Department of Ophthalmology, Nagoya University School of Medicine, Japan.
Investigative Ophthalmology & Visual Science March 1993, Vol.34, 512-515. doi:https://doi.org/
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    • Get Citation

      Y Miyake, N Shiroyama, I Ota, M Horiguchi; Focal macular electroretinogram in X-linked congenital retinoschisis.. Invest. Ophthalmol. Vis. Sci. 1993;34(3):512-515. doi: https://doi.org/.

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

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Abstract

PURPOSE: To study macular function of X-linked congenital retinoschisis (CRS) by focal macular electroretinogram (MERG). METHODS: MERGs were recorded with 5 degrees, 10 degrees, and 15 degrees spots in 20 patients with CRS. Seventeen patients showed foveal schisis with little or no change in foveal fluorescein angiography (Group 1), and three patients showed advanced macular changes with nonspecific macular degeneration (Group 2). RESULTS: In Group 1, a-wave amplitudes were within the normal range, but b-waves and oscillatory potentials (OPs) had mean amplitudes significantly below those for normal control subjects. The mean b- to a-wave ratios, significantly lower than in normal eyes, decreased significantly with decreasing spot size. The implicit times of a-waves, b-waves, and OPs were significantly delayed. In Group 2, MERGs were nearly nondectable. CONCLUSIONS: The macular pathology of CSR exists mainly in the middle and inner retinal layers, disturbing the fovea more than the perifovea, whereas degeneration of photoreceptors progresses in more advanced stage.

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