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Related Experiment Videos

Diamond knife corneal incisions.

S R Unterman, J J Rowsey

    Ophthalmic Surgery
    |March 1, 1984
    PubMed
    Summary

    Corneal incision depth varied significantly among diamond-bladed knives, exceeding calibrated lengths. This variability in radial keratotomy (RK) knife performance suggests design differences impact predictability.

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    Area of Science:

    • Ophthalmology
    • Surgical Technology
    • Biomedical Engineering

    Background:

    • Radial keratotomy (RK) is a refractive surgical procedure.
    • Accurate corneal incision depth is crucial for RK outcomes.
    • Variability in surgical tool performance can affect predictability.

    Purpose of the Study:

    • To evaluate the accuracy and consistency of corneal incision depths made by three diamond-bladed knives.
    • To compare the performance of KOI, Cooper, and Micra micrometer knives in creating linear corneal incisions.
    • To investigate the impact of knife design on incision depth variability in radial keratotomy.

    Main Methods:

    • Eight linear corneal incisions were created in human cadaver eyes using KOI, Cooper, and Micra knives.
    • Corneal pachymetry was measured pre-incision; knives were calibrated to 0.55 mm cutting depth.
    • Post-incision, corneas were histologically sectioned to measure actual incision depth.

    Main Results:

    • Incision depths frequently exceeded the calibrated diamond length (0.55 mm).
    • Significant depth variations occurred among incisions made with the same knife and between different knives.
    • Depth variability was observed across all tested knives, with minimal exceptions.

    Conclusions:

    • Diamond-bladed knife performance in creating corneal incisions is inconsistent.
    • Knife design likely contributes to significant variability in incision depth.
    • This unpredictability poses challenges for achieving consistent radial keratotomy outcomes.

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