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Non-Contact IOP Estimation Based on Corneal Stress Birefringence: Experimental and Computational Validation
Haoyuan Li1, Yinda Li1, Zhenhua Guo1
1School of Science, Hebei University of Technology, Tianjin 300401, China.
Sensors (Basel, Switzerland)
|June 12, 2026
Summary
This study introduces a novel non-contact method for estimating intraocular pressure (IOP) using corneal stress birefringence. The technique shows promise for accurate IOP assessment in glaucoma diagnosis and management.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optics
Background:
- Accurate intraocular pressure (IOP) measurement is crucial for diagnosing and monitoring glaucoma.
- Conventional contact tonometry methods face limitations including operator dependence and patient discomfort.
Purpose of the Study:
- To develop and evaluate a non-contact IOP estimation framework utilizing corneal stress birefringence and full-field fringe inversion.
- To assess the accuracy and reliability of this novel method in ex vivo conditions.
Main Methods:
- Imaging ex vivo porcine corneas under controlled pressure loading (15-20 mmHg).
- Employing a coupled stress-optic/shell mechanics model to generate synthetic fringe fields for inverse fitting.
- Analyzing full-field fringe patterns to estimate IOP and assess regional corneal biomechanics.
Main Results:
- Over 75% of IOP estimates were within ±1 mmHg of the reference pressure in the 15-18 mmHg range.
- Accuracy decreased at higher pressures (19-20 mmHg) due to nonlinear biomechanics.
- Defect experiments highlighted the importance of full-field analysis for detecting local stiffness variations.
Conclusions:
- Corneal stress birefringence imaging offers a promising non-contact approach for IOP assessment.
- The method demonstrates potential for region-sensitive IOP evaluation, addressing limitations of current tonometry.
- Further development could lead to improved glaucoma diagnosis and patient care.
