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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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[Inherited retinal or optic nerve disorders – five steps to diagnosis].

U Kellner1, S Kellner1, S Weinitz1

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Early diagnosis of inherited retinal and optic nerve disorders is often delayed. A structured diagnostic strategy using non-invasive imaging and DNA testing can significantly reduce delays and improve patient outcomes.

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Area of Science:

  • Ophthalmology
  • Genetics
  • Medical Diagnostics

Context:

  • Diagnosing inherited retinal and optic nerve disorders is challenging due to non-specific symptoms and genetic complexity.
  • A retrospective analysis of 4,021 patients (1986-2014) evaluated diagnostic methods for these conditions.

Purpose:

  • To propose an efficient diagnostic strategy for inherited retinal and optic nerve disorders.
  • To highlight the role of advanced imaging and genetic testing in improving diagnostic timelines.

Summary:

  • The study analyzed data from 4,021 patients, incorporating ophthalmological exams, electrophysiological tests (ERG, EOG, VEP, mfERG), and advanced retinal imaging (FAF, NIA, SD-OCT, MC).
  • Molecular DNA testing was performed on 383 patients. A suggested strategy includes differential diagnosis, non-invasive imaging, electrophysiology, DNA testing, and specialized care.
  • Non-invasive retinal imaging is now a primary tool, complemented by high-throughput DNA testing for gene mutation identification.

Impact:

  • Implementing a structured diagnostic process can significantly reduce diagnostic delays for inherited eye disorders.
  • Earlier diagnosis facilitates timely genetic counseling, treatment initiation, and avoidance of unnecessary investigations.
  • This approach improves patient management and outcomes for individuals with inherited retinal and optic nerve conditions.