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Intraoperative raster photogrammetry--the PAR Corneal Topography System
1Albany Medical College Department of Ophthalmology, New York 12203.
Journal of Cataract and Refractive Surgery
|January 1, 1993
Summary
The PAR Corneal Topography System (CTS) offers advanced corneal imaging using raster photogrammetry. This technology provides true elevation maps, overcoming limitations of older systems for potential intraoperative refractive monitoring.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Optical Imaging
Background:
- Traditional videokeratoscopes using Placido-discs have limitations in imaging non-reflective or misaligned surfaces.
- Accurate corneal topography is crucial for diagnosing and managing various eye conditions.
Purpose of the Study:
- To introduce and evaluate the PAR Corneal Topography System (CTS) for corneal surface measurement.
- To assess the CTS's capability for intraoperative refractive monitoring.
Main Methods:
- Utilized close-range raster photogrammetry to create a 2D grid distortion map.
- Developed a system independent of smooth reflective surfaces and precise spatial alignment.
- Integrated a modified CTS into an experimental erbium: YAG photoablative laser system.
Main Results:
- The PAR CTS successfully generated true topographic (elevation) maps of the corneal surface.
- Imaging was accurate without requiring a smooth reflective surface or precise alignment.
- The integrated CTS effectively imaged corneas before, during, and after laser photoablation.
Conclusions:
- The PAR CTS provides a true elevation map of the cornea, surpassing Placido-disc limitations.
- Its ability to image nonreflective surfaces and integrate with optical devices is advantageous.
- The system shows promise for intraoperative refractive monitoring during ophthalmic procedures.