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Optic nerve head stereoscopic digital imaging using bichromatic techniques

B Rector, B J Ludwig, J E Terry

    Optometry and Vision Science : Official Publication of the American Academy of Optometry
    |January 1, 1996
    PubMed
    Summary
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    The updated Topcon IMAGEnet software (versions 3.4 vs. 3.5) offers improved accuracy for optic nerve analysis. This enhancement is shown by a reduction in poorly correlated points, leading to more reliable cup volume and neuroretinal rim area measurements.

    Area of Science:

    • Ophthalmology
    • Medical Imaging
    • Computational Vision

    Background:

    • Accurate measurement of optic nerve parameters is crucial for diagnosing and monitoring glaucoma and other optic neuropathies.
    • Computer-based stereo analysis systems are widely used for quantitative assessment of optic nerve head topography.
    • Software updates can potentially improve the precision and reliability of these measurements.

    Purpose of the Study:

    • To evaluate the variability and consistency of optic nerve parameters derived from two versions (3.4 and 3.5) of the Topcon IMAGEnet computer stereo analysis system.
    • To compare the performance of the updated software in assessing key optic nerve metrics.

    Main Methods:

    • Optic nerve parameters including horizontal and vertical cup-to-disc ratio, cup volume, neuroretinal rim area, and neuroretinal rim-to-disc area were analyzed.

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  • The percentage of poorly correlated conjugate points (bad points) was used as an indicator of measurement reliability.
  • Statistical comparison of parameters obtained from versions 3.4 and 3.5 was performed.

    • Main Results:

    • The updated version 3.5 demonstrated significantly greater accuracy in assessing cup volume and neuroretinal rim area compared to version 3.4.
    • A lower percentage of poorly correlated conjugate points (bad points) was observed with version 3.5, indicating improved data quality.
    • Consistency in other parameters like cup-to-disc ratios and rim-to-disc area was also evaluated.

    Conclusions:

    • The updated Topcon IMAGEnet software (version 3.5) offers a more accurate and reliable method for quantifying optic nerve head parameters, specifically cup volume and neuroretinal rim area.
    • The reduction in measurement errors, indicated by fewer bad points, suggests enhanced clinical utility for glaucoma assessment.
    • This software improvement facilitates more precise longitudinal monitoring of optic nerve health.