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Corneal topography using rasterstereography
R C Arffa1, J W Warnicki, P G Rehkopf
1Eye and Ear Institute, Pittsburgh, PA 15213.
Refractive & Corneal Surgery
|November 1, 1989
Summary
Rasterstereography offers a novel approach to corneal topography, unaffected by surface reflectivity. This advanced imaging technique captures detailed ocular surface data, even with irregularities, providing comprehensive 3D corneal visualization.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Medical Imaging
Background:
- Assessing corneal topography is crucial for diagnosing and managing various eye conditions.
- Existing methods like Placido disc systems rely on corneal reflectivity, limiting their application in certain clinical scenarios.
Purpose of the Study:
- To introduce and describe rasterstereography as a new method for determining corneal topography.
- To highlight the advantages of rasterstereography over traditional methods, particularly its independence from corneal reflectivity.
Main Methods:
- Rasterstereography projects a grid of light bars onto the cornea.
- A video camera captures the distorted grid pattern, which is then digitized and analyzed.
- The system generates a three-dimensional image of the corneal surface, including elevation and curvature maps.
Main Results:
- Rasterstereography provides detailed topographical information of the entire corneal, limbal, and conjunctival surfaces.
- The method successfully acquires images despite epithelial irregularities, defects, sutures, or stromal ulceration.
- 3D corneal surface reconstruction, contour maps, and curvature data can be generated.
Conclusions:
- Rasterstereography is a versatile and robust technique for corneal topography.
- Its ability to image compromised corneal surfaces expands diagnostic capabilities in ophthalmology.