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Related Experiment Video

Updated: May 2, 2026

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Using an Automated Hirschberg Test App to Evaluate Ocular Alignment

Published on: March 24, 2020

Magnetic prism alignment system for measuring large-angle strabismus.

John Edward Bishop¹

¹Driscoll Children's Hospital, Corpus Christi, Texas.

Journal of AAPOS : the Official Publication of the American Association for Pediatric Ophthalmology and Strabismus

|February 27, 2014

Summary

Measuring large-angle strabismus (eye misalignment) is challenging. A new prism system using magnets simplifies this clinical measurement process.

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Area of Science:

Ophthalmology
Optometry
Biomedical Engineering

Background:

Prismatic measurement is crucial for diagnosing and managing strabismus.
Accurate measurement of large-angle strabismus often requires complex setups with multiple prisms.

Purpose of the Study:

To develop an improved system for the clinical measurement of large-angle strabismus.
To simplify the process of neutralizing large-angle deviations.

Main Methods:

A novel prism system was designed for strabismus measurement.
The system incorporates a flat plate and a ferrous metal surface.
Prisms with embedded rare earth magnets in their base and bottom surfaces were utilized.

Main Results:

The new system facilitates the simultaneous use of multiple prisms.
The magnetic coupling simplifies the assembly and stability of the prism system.
This design aims to enhance the ease and accuracy of large-angle strabismus measurement.

Conclusions:

The developed magnetic prism system offers a practical solution for measuring large-angle strabismus.
This innovation has the potential to improve clinical efficiency and patient outcomes in strabismus management.