| Popis: |
Electroretinography and studies of dark adaptation are both frequently used laboratory tests for retinitis pigmentosa (R.P.). Until the past decade, a complete absence of the electroretinogram (ERG) was thought to be pathognomonic for R.P. (francois, 1961) but Rubino & Ponte (1962) documented the presence of a subnormal ERG in 30 patients reported by 8 different authors. All of these patients showed decreased dark adaptation, whatever the evolution or seriousness of their disease. This high correlation between abnormal dark adaptation and electroretinography in the diagnosis of R.P. has been found by other authors. (Campbell, 1965; Gouras & Carr 1964, Gouras, Armington, Kropfl & Gunkel 1964) This raises the question of whether studies of dark adaptation (DA) are of equal or greater diagnostic value than electroretinography. |
