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Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
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Related Experiment Video

Updated: Mar 26, 2026

Measuring the Behavioral Effects of Intraocular Scatter
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Objective Scatter Index: Working Toward a New Quantification of Cataract?

Florence Galliot, Sunni R Patel, Béatrice Cochener

    Journal of Refractive Surgery (Thorofare, N.J. : 1995)
    |February 10, 2016
    PubMed
    Summary

    Objective Scatter Index (OSI) effectively detects cataracts by correlating with visual acuity and quality of life. This measurement tool shows high sensitivity and efficiency in identifying cataract severity.

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    Area of Science:

    • Ophthalmology
    • Medical Optics
    • Vision Science

    Background:

    • Cataract is a leading cause of vision impairment.
    • Assessing cataract severity often relies on subjective clinical grading.
    • Objective measures of ocular transparency are needed for early detection.

    Purpose of the Study:

    • To correlate clinical cataract classifications and quality of life (QOL) with objective measures of ocular transparency.
    • To evaluate the Objective Scatter Index (OSI) as a tool for cataract assessment.

    Main Methods:

    • Prospective, multicenter, cross-sectional study of 1,768 patients.
    • Measured visual acuity and used Lens Opacities Classification System III for grading.
    • Assessed QOL using the Visual Function Index (VF-14) questionnaire.
    • Quantified ocular transparency using Objective Scatter Index (OSI) via HD Analyzer.

    Main Results:

    • Higher OSI levels correlated with lower visual acuity and VF-14 scores.
    • OSI demonstrated strong association with cataract classification and severity.
    • HD Analyzer's OSI showed high sensitivity and efficiency in cataract detection.

    Conclusions:

    • The Objective Scatter Index (OSI) measured by the HD Analyzer is a sensitive and efficient tool.
    • OSI can aid in the early detection of cataracts in clinical practice.