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Related Experiment Videos

Hook and loop fastener on loose prisms assists in measuring ocular deviation

I F Wessels1, S Thomas, D A Wessels

  • 1University of Tennessee College of Medicine, Chattanooga, USA.

Ophthalmic Surgery and Lasers
|October 7, 1998
PubMed
Summary

A new Velcro system simplifies holding loose prisms for strabismus evaluation. This method accurately assesses ocular deviations, improving clinical convenience for strabismus surgery patients.

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Area of Science:

  • Ophthalmology
  • Surgical Technology

Background:

  • Handling loose prisms for ocular deviation assessment can be inaccurate, especially with large-angle exotropia or vertical deviations.
  • Existing methods for prism manipulation may lack stability and ease of use during clinical evaluations.

Purpose of the Study:

  • To introduce and evaluate a novel, simple system for securely holding loose prisms during the clinical assessment of ocular deviations.
  • To determine the accuracy and practicality of this Velcro-based prism holder in patients undergoing strabismus surgery.

Main Methods:

  • A Velcro-based system was developed by attaching hooked Velcro strips to prisms and looped Velcro to a wooden bar.
  • This system allows prisms to be suspended and held easily in one hand, facilitating horizontal and/or vertical adjustments.

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  • A retrospective study of 40 consecutive strabismus surgery patients (without adjustable sutures) evaluated the accuracy of this method.

    • Main Results:

    • The system demonstrated ease of use and convenience in clinical practice.
    • In patients with exotropia, esotropia, abducens paralysis, and trochlear palsies, the method facilitated accurate prism use.
    • Post-surgical residual deviation was less than 10 D in all but 2 patients (5.9%), indicating high accuracy.

    Conclusions:

    • The developed Velcro prism holder is a simple, inexpensive, and effective tool for clinical evaluation of ocular deviations.
    • This system enhances the accuracy and convenience of prism manipulation, aiding in precise strabismus assessment and surgical planning.