Accuracy of the PAR corneal topography system with spatial misalignment

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optical Imaging

Background:

• Corneal topography is crucial for diagnosing and managing eye conditions.
• Existing videokeratoscopes often require precise alignment and smooth surfaces.
• A need exists for robust corneal imaging systems adaptable to surgical conditions.

Purpose of the Study:

• To evaluate the accuracy and reproducibility of the PAR Corneal Topography System.
• To assess the system's capability in imaging compromised corneal surfaces.
• To determine the suitability of the PAR system for intraoperative refractive monitoring.

Main Methods:

• Utilized close-range raster photogrammetry to generate corneal topographic maps.
• Tested system accuracy with purposeful misalignment (defocusing) of calibrated spheres.
• Imaged cadaver eyes before and after epithelial removal, keratectomy, and photoablation.

Main Results:

• The PAR system demonstrated accuracy and reproducibility in imaging calibrated spheres.
• The system successfully imaged irregular, deepithelialized, and keratectomized corneas.
• Accurate imaging was achieved without requiring precise spatial alignment.

Conclusions:

• The PAR Corneal Topography System offers accurate and reproducible corneal mapping.
• Its ability to image compromised corneas and tolerate misalignment is advantageous.
• The system shows promise for real-time intraoperative refractive monitoring during ophthalmic surgery.