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A technique for standardizing disk foveal angle measurement.

Jitendra Jethani1, Paaraj Dave1

  • 1Dr. T V Patel Eye Institute, Vadodara, India.

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

Measuring ocular torsion and the disk-foveal angle (DFA) can vary. This study introduces a novel, accessible technique using common software for more consistent DFA measurements from fundus photos.

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Biomedical Engineering

Background:

  • Ocular torsion is a key parameter in binocular vision assessment.
  • Existing methods for measuring ocular torsion, including the disk-foveal angle (DFA), exhibit significant variability.
  • Fundus photography is a common imaging modality, but precise DFA measurement remains challenging.

Purpose of the Study:

  • To present a standardized and reproducible technique for measuring the disk-foveal angle (DFA) using fundus photography.
  • To offer an accessible method for quantifying ocular torsion.
  • To address the reported variations in DFA measurements.

Main Methods:

  • A novel technique for DFA measurement was developed.
  • Utilized readily available software: Microsoft PowerPoint and ImageJ.
  • Defined the DFA by lines connecting the optic disk center to the fovea and a horizontal line from the optic disk center.

Main Results:

  • The described method provides a practical approach to DFA measurement.
  • This technique aims to reduce variability in ocular torsion assessment.
  • Software-based analysis offers potential for improved accuracy and consistency.

Conclusions:

  • A new, accessible method for measuring the disk-foveal angle (DFA) has been established.
  • This technique can enhance the reliability of ocular torsion measurements in clinical and research settings.
  • The use of common software facilitates wider adoption and application.