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Measurement of ocular torsion using digital fundus image
1Department of Ophthalmology, Seoul National University College of Medicine, Seoul, South Korea.
Summary
A new computer program objectively measures ocular cyclotorsion using digital fundus photos. This digital fundus photography analysis shows high accuracy, matching specialist evaluations for precise disease diagnosis.
Area of Science:
- Ophthalmology
- Medical Imaging
- Computer Vision
Background:
- Ocular cyclotorsion measurement is crucial for diagnosing various eye conditions.
- Current methods for assessing cyclotorsion can be subjective and time-consuming.
Purpose of the Study:
- To develop and validate a computer-based objective method for measuring ocular cyclotorsion.
- To assess the accuracy of the developed program against specialist evaluations.
Main Methods:
- Digital color fundus photographs (60-degree field angle, 1520x1080 resolution) were analyzed.
- A MATLAB-based program segmented the optic disc and macula using Otsu threshold, labeling, and Canny edge detection.
- The angle between the optic disc bisector and the optic disc-macula line was calculated and compared to specialist measurements.
Main Results:
- The computer program achieved a mean calculated angle of 3.02±1.24 degrees.
- The mean torsion determined by specialists was 3.13±1.98 degrees.
- No significant difference was found between the computer-based measurements and specialist evaluations.
Conclusions:
- The developed computer program provides an accurate and objective measurement of ocular cyclotorsion.
- This tool demonstrates good coincidence with specialist assessments, offering potential for precise diagnosis and objective disease evaluation in ophthalmology.
