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Related Experiment Videos

Visual field defects in onchocerciasis.

B Thylefors, A M Tønjum

    The British Journal of Ophthalmology
    |July 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Onchocerciasis posterior eye lesions cause significant visual field defects, particularly affecting the optic nerve. This visual impairment leads to severely constricted fields, impacting patients

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    Area of Science:

    • Ophthalmology
    • Tropical Medicine
    • Parasitology

    Background:

    • Onchocerciasis, a parasitic disease, can affect the posterior segment of the eye.
    • Previous research has not extensively detailed the functional visual loss caused by these ocular lesions.

    Purpose of the Study:

    • To investigate and characterize visual field defects in patients with onchocerciasis.
    • To determine the extent of functional visual loss associated with posterior segment ocular lesions in onchocerciasis.

    Main Methods:

    • Examination of visual fields using a tangent screen test.
    • Study included 18 selected cases of onchocerciasis with posterior segment ocular lesions.

    Main Results:

    • Significant visual field defects were observed in all cases.

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  • Optic nerve involvement was a key factor, leading to severely constricted visual fields.
  • Postneuritic optic atrophy and papillitis resulted in almost complete visual field constriction, sparing only a small central area (5-10 degrees).

    • Conclusions:

    • The pattern of visual field defects suggests progressive optic nerve lesions from the periphery contribute to vision loss in onchocerciasis.
    • Visual field deficits in onchocerciasis represent a significant handicap with considerable socioeconomic implications.