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Sector area index: a novel supporting marker for blepharoptosis screening and grading
Tahereh Mahmoudi1, Hamid Riazi-Esfahani2, Zahra Montazeriani3
1Department of Medical Physics and Biomedical Engineering, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran.
International Ophthalmology
|November 1, 2023
Summary
A new Sector Area Index (SAI) and semi-automated method effectively differentiate ptosis grades. The SAI difference between eyes, particularly in specific sectors, shows significant diagnostic potential for ptosis severity.
Area of Science:
- Ophthalmology
- Medical Imaging
Background:
- Accurate grading of ptosis is crucial for effective treatment.
- Existing methods for ptosis assessment may lack objective quantification.
Purpose of the Study:
- To introduce the Sector Area Index (SAI) as a novel supporting marker for ptosis grading.
- To present a semi-automated technique for calculating SAI.
Main Methods:
- A cross-sectional comparative case series involving 106 eyes across control and ptosis groups.
- Semi-automated calculation of SAI using a circle around the intercanthal distance and sector analysis of the palpebral fissure.
- Comparison of SAI values and inter-eye differences between different ptosis grades.
Main Results:
- Mean SAI values decreased progressively from normal to severe ptosis groups.
- Statistically significant differences in mean SAI values were observed between study and fellow eyes across all groups (p < 0.05).
- Specific nasal sectors (15°-60°) showed significant differences in mean SAI values between all patient groups.
Conclusions:
- The mean difference of SAI, especially in sectors 15°-60° and 120°-165°, demonstrates significant performance in detecting and discriminating varying ptosis grades.
- SAI offers a quantifiable and objective measure for ptosis assessment.
- The semi-automated technique facilitates reproducible SAI calculation.
