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Metabolic optic neuropathies.

Alfredo A Sadun1

  • 1Department of Ophthalmology, Doheny Eye Institute, University of Southern California, 1450 San Pablo Street, Los Angeles, CA 90033, USA. asadun@hsc.usc.edu

Seminars in Ophthalmology
|October 30, 2004
PubMed
Summary
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Metabolic optic neuropathies cause vision loss and are linked to mitochondrial dysfunction. Treatments vary, including nutrient supplements for deficiencies or toxin avoidance for toxicities.

Area of Science:

  • Ophthalmology
  • Neurology
  • Genetics

Background:

  • Metabolic optic neuropathies present with bilateral symmetrical vision loss, affecting central acuity, color vision, and visual fields.
  • Key characteristics include optic disc atrophy and nerve fiber layer loss in the papillomacular bundle.
  • These neuropathies encompass heredodegenerative, nutritional deficiency, and toxic causes, all impacting mitochondrial function.

Purpose of the Study:

  • To categorize and describe the spectrum of metabolic optic neuropathies.
  • To elucidate the underlying mitochondrial impairment common to these conditions.
  • To outline current treatment strategies based on the etiology of the neuropathy.

Main Methods:

  • Literature review and synthesis of existing research on metabolic optic neuropathies.

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  • Classification of neuropathies into heredodegenerative, nutritional, and toxic subtypes.
  • Analysis of clinical presentations, diagnostic features, and treatment outcomes.

    • Main Results:

    • Heredodegenerative forms (e.g., Leber's hereditary optic neuropathy) result from congenital mitochondrial defects.
    • Nutritional deficiencies (e.g., vitamin B12, folic acid) and toxic exposures (e.g., ethambutol, cyanide) cause acquired mitochondrial injury.
    • Most metabolic optic neuropathies are fundamentally linked to mitochondrial dysfunction.

    Conclusions:

    • Metabolic optic neuropathies represent a group of mitochondrial disorders affecting vision.
    • Currently, no effective treatment exists for heredodegenerative forms.
    • Nutritional and toxic subtypes are managed by addressing the specific deficiency or toxin exposure.