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Related Experiment Videos

Interference fringe scale for absolute ocular fundus measurement.

S J Kennedy, B Schwartz, T Takamoto

    Investigative Ophthalmology & Visual Science
    |February 1, 1983
    PubMed
    Summary

    Accurate human eye fundus measurements are now possible. A novel method uses interference fringes on the fundus, creating a precise scale for dimensional analysis, overcoming previous optical system limitations.

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    Area of Science:

    • Ophthalmology
    • Biomedical Optics
    • Metrology

    Background:

    • Ocular fundus measurements have lacked absolute accuracy due to reliance on the eye's optical system.
    • Variations in individual eye dioptric power cause significant ophthalmoscopic magnification discrepancies.
    • Existing techniques are limited by the variable optical properties of the human eye.

    Purpose of the Study:

    • To develop a novel method for absolute, accurate 3D measurements of the human ocular fundus.
    • To overcome the limitations imposed by the variable optical system of the eye.
    • To establish a reliable in-situ scale for ocular fundus metrology.

    Main Methods:

    • Development of a technique to project interference fringes onto the ocular fundus.
    • Calculation of precise fringe spacing using measured values.
    • Utilizing photographed fringes as an intrinsic scale for fundus imaging.

    Main Results:

    • The new method enables accurate calculation of fringe spacing on the fundus.
    • Interference fringes provide a reliable, error-minimized scale for fundus measurements.
    • Absolute 3D measurements of the ocular fundus are achievable despite ocular media interference.

    Conclusions:

    • A new interference fringe-based method allows for absolute and accurate 3D measurements of the human ocular fundus.
    • This technique circumvents issues related to variable ocular magnification.
    • The method provides a robust tool for precise ocular metrology.

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