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Related Experiment Videos

Cup-disc ratio and ischemic optic neuropathy.

S Doro, S Lessell

    Archives of Ophthalmology (Chicago, Ill. : 1960)
    |August 1, 1985
    PubMed
    Summary

    Patients with anterior ischemic optic neuropathy had smaller cup-disc ratios in their fellow eyes compared to optic neuritis patients and normal subjects. Small cup-disc ratios may increase vulnerability to optic nerve infarction.

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    Area of Science:

    • Ophthalmology
    • Neurology

    Background:

    • Anterior ischemic optic neuropathy (AION) is a common cause of sudden vision loss.
    • The pathophysiology of AION, particularly risk factors in fellow eyes, remains incompletely understood.
    • Cup-disc ratio, a measure of optic nerve head anatomy, has been investigated as a potential risk factor.

    Purpose of the Study:

    • To compare cup-disc ratios in fellow eyes of patients with unilateral AION versus those with unilateral optic neuritis.
    • To assess the relationship between cup-disc ratio and vulnerability to optic nerve infarction.

    Main Methods:

    • Cup-disc ratios were measured from stereophotographs in fellow eyes of 26 AION patients and 29 optic neuritis patients.
    • These ratios were compared to a normative database from a population survey.
    • Measurements were performed by blinded observers.

    Main Results:

    • Fellow eyes of AION patients exhibited significantly smaller average cup-disc ratios compared to fellow eyes of optic neuritis patients.
    • Cup-disc ratios in AION fellow eyes were also significantly smaller than those in the normal population.
    • A smaller cup-disc ratio was observed in the fellow eyes of patients with AION.

    Conclusions:

    • Smaller cup-disc ratios in the fellow eye may indicate increased susceptibility to infarction.
    • This finding suggests that optic nerve head anatomy could be a predisposing factor for AION.

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