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Tritan pedigree without optic-nerve atrophy.

K E Higgins, D N Brooks, G Gottschalk

    American Journal of Optometry and Physiological Optics
    |December 1, 1983
    PubMed
    Summary
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    Tritan color deficiency, a rare blue-yellow vision impairment, can occur independently of dominant optic atrophy. This study confirms its presence in a family without optic atrophy, supporting its distinct genetic basis.

    Area of Science:

    • Ophthalmology
    • Genetics
    • Visual Neuroscience

    Background:

    • Previous research has raised questions about the independent occurrence of tritan color deficiency.
    • Dominantly inherited optic atrophy is a condition affecting the optic nerve.

    Purpose of the Study:

    • To investigate the occurrence of tritan color deficiency separate from dominantly inherited optic atrophy.
    • To analyze a pedigree with suspected tritan color deficiency.

    Main Methods:

    • Genetic and visual function testing was performed on 34 members of a family.
    • Optic atrophy was excluded based on established criteria (Krill et al.).

    Main Results:

    • Four individuals within the pedigree were identified as having tritan color deficiency.

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  • These individuals did not exhibit signs of optic atrophy.

    • Conclusions:

    • Tritan color deficiency can occur independently of dominantly inherited optic atrophy.
    • This finding supports a distinct genetic etiology for isolated tritan defects.