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Inherited snowflake cataracts.

M F Goldberg, M Tso, F Chen

    Ophthalmic Paediatrics and Genetics
    |December 1, 1984
    PubMed
    Summary
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    This study details a unique inherited cataract characterized by flake-like opacities in two families. The findings reveal a distinct microscopic pattern of degeneration in the lens, offering insights into genetic eye conditions.

    Area of Science:

    • Ophthalmology
    • Genetics
    • Cell Biology

    Background:

    • Cataracts are a leading cause of vision loss, often associated with aging, but inherited forms provide insights into lens biology.
    • Understanding the genetic basis and ultrastructural characteristics of rare cataract types is crucial for diagnosis and potential therapeutic strategies.

    Observation:

    • Two pedigrees presented with a distinct, inherited cataract phenotype described as flake-like opacities.
    • These 'type B opacities' were predominantly located in the lens cortex, characterized by large, irregular, white, flattened flakes with feathery edges.

    Findings:

    • Histological examination revealed irregular pale-staining areas, and ultrastructural analysis showed extensive microglobular degeneration adjacent to normal lens fibers.
    • Type A opacities, distinct from type B, were smaller and punctate, with different ultrastructural globule characteristics.

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  • Electron probe analysis confirmed normal calcium levels, ruling out calcification as a cause.

    • Implications:

    • The unique biomicroscopic and ultrastructural features suggest a novel form of inherited cataract with a specific Mendelian inheritance pattern (likely autosomal dominant).
    • This discovery contributes to the classification of inherited lens disorders and may serve as a model for studying lens fiber degeneration.
    • Further research into the specific genetic mutations underlying this cataract type could elucidate fundamental mechanisms of lens transparency and disease.