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Classical tritanopia.

M Alpern, K Kitahara, D H Krantz

    The Journal of Physiology
    |February 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Acquired tritanopia, a blue-yellow color vision defect, presents identically to congenital tritanopia. This study suggests tritanopia is a simplified form of normal trichromatic vision, potentially involving only two cone pigments.

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    Area of Science:

    • Ophthalmology
    • Color Vision Research
    • Neuroscience

    Background:

    • Central serous chorio-retinopathy can lead to acquired color vision defects.
    • Tritanopia is a specific type of blue-yellow color vision deficiency.

    Purpose of the Study:

    • To investigate the characteristics of acquired tritanopia in a patient with central serous chorioretinopathy.
    • To compare the color vision of the affected eye with congenital tritanopia and the unaffected eye with normal trichromacy.

    Main Methods:

    • Color matching experiments using distimulus functions.
    • Spectral luminosity and wavelength discrimination tests.
    • Increment threshold versus intensity (t.v.i.) curves were analyzed.

    Main Results:

    Related Experiment Videos

    • The affected eye exhibited dichromacy consistent with congenital tritanopia, while the unaffected eye showed normal trichromacy.
    • Analysis of t.v.i. curves revealed a single visual mechanism in the dichromatic eye, unlike the three in the trichromatic eye.
    • Differences in ocular media transmission were accounted for, showing similar underlying visual mechanisms between the two eyes.

    Conclusions:

    • Acquired tritanopia is clinically indistinguishable from congenital tritanopia.
    • Tritanopia can be viewed as a reduced form of trichromatic vision.
    • The findings support the hypothesis that tritanopia may rely on only two types of cone pigments.