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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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[Quantitative Color Vision Defect Evaluation - Lanthony Test and its Modified Interpretation].

P Veselý, D Urbánek, S Synek

    Ceska a Slovenska Oftalmologie : Casopis Ceske Oftalmologicke Spolecnosti a Slovenske Oftalmologicke Spolecnosti
    |June 25, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study developed a quick instrument for diagnosing color vision defects (CVD) using the Lanthony test. The method identified 29% of patients with CVD, distinguishing types like dichromacy and anomaly trichromacy.

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    Area of Science:

    • Ophthalmology
    • Vision Science

    Background:

    • Color vision defects (CVD) impact daily life and require accurate diagnostic tools.
    • The Lanthony test is a standard instrument for assessing color vision.

    Purpose of the Study:

    • To develop a rapid and precise instrument for the examination of color vision defects (CVD).
    • To evaluate the efficacy of the Lanthony saturated and desaturated test for CVD diagnosis.

    Main Methods:

    • Utilized the Lanthony saturated and desaturated test on 123 eyes from 86 patients.
    • Data analyzed using the Vingrys and King-Smith method.
    • Established critical values for Total Error Score (TES), Index of Selectivity (SI), and Index of Confusion (CI).

    Main Results:

    • Identified 25 patients (29%) with CVD.
    • Dichromacy was diagnosed in 12 patients (14%), all with inborn CVD (8% deutranopia, 5% protanopia).
    • Anomaly trichromacy found in 13 patients (15%), with 9% having inborn CVD (7% protanomalia, 1% deuteranomalia, 1% tritanomalia).

    Conclusions:

    • The developed algorithm and established critical values for TES, CI, and SI provide an effective method for classifying CVD.
    • The Lanthony test, when analyzed with these parameters, offers a quick and exact instrument for CVD examination.