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  • Title: [Inherited retinal or optic nerve disorders – five steps to diagnosis].
    Author: Kellner U, Kellner S, Weinitz S, Farmand G, Weber BH, Stöhr H.
    Journal: Klin Monbl Augenheilkd; 2015 Mar; 232(3):250-8. PubMed ID: 25803554.
    Abstract:
    An early diagnosis of inherited retinal or optic nerve disorders is often delayed due to unspecific clinical signs, multiple clinical manifestations and striking genetic heterogeneity of the underlying molecular defects. This study represents a retrospective analysis of findings in 4,021 patients with inherited retinal or optic nerve disorders seen between 1986 and 2014 (1,171 with follow-up). In addition to the basic ophthalmological examination, electrophysiological tests (ERG, n = 2,088, since 1986; EOG, n = 381, since 1986; VEP n = 595, since 1986; mfERG, n = 819, since 1998) and non-invasive retinal imaging (fundus autofluorescence (FAF, n = 1,784, since 2002), near-infrared autofluorescence (NIA, n = 1,091, since 2006), spectral domain OCT (SD-OCT, n = 848, since 2008) and three-wavelengths multicolour spectral reflection imaging (MC, n = 366, since 2013) were performed at least once. Molecular DNA testing was done in 383 patients between 2006 and 2014. Based on these data an efficient diagnostic strategy is suggested: 1) inclusion of inherited retinal and optic nerve disorders into the differential diagnosis of visual loss or visual field defects with undefined causes; 2) non-invasive retinal imaging; 3) electrophysiological tests; 4) DNA testing to confirm the initial clinical diagnosis; 5) examination in specialised centres, therapy and follow-up. In recent years, the spectrum of diagnostic techniques has continuously expanded. Importantly, non-invasive retinal imaging has become the primary diagnostic tool and DNA testing based on state-of-the-art high throughput techniques increases the identification of associated gene mutations. In conclusion, a structured process in the diagnostic procedure of inherited retinal and optic nerve disorders greatly reduces a diagnostic delay, enables an earlier counselling and therapy and avoids further unnecessary diagnostic tests.
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