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Preliminary tests and construction of a computerized quantitative surgical keratometer
L Carvalho1, S A Tonissi, J C Castro
1Instituto de Física de São Carlos-USP, Brazil.
Journal of Cataract and Refractive Surgery
|June 22, 1999
Summary
A new computer-based surgical keratometer precisely measures corneal shape using a Placido disk and image processing. This device aids in accurate corneal shape control during surgical procedures.
Area of Science:
- Ophthalmic optics
- Biomedical engineering
- Medical instrumentation
Background:
- Accurate measurement of corneal curvature is crucial for ophthalmic surgery.
- Existing methods may have limitations in precision or accessibility.
Purpose of the Study:
- To develop a simple, computer-based quantitative surgical keratometer.
- To measure the central 3.0 to 4.0 mm of the corneal surface.
Main Methods:
- Projected a Placido disk (ring pattern) onto the cornea.
- Captured reflected images using a CCD camera and microscope.
- Employed image processing for border detection and calculated diopter values.
Main Results:
- Achieved mean deviations of 0.05 mm (radius), 0.24 diopters (power), and 5 degrees (cylinder).
- Demonstrated precise measurements when compared to a corneal topographer.
Conclusions:
- The developed keratometer offers precise measurements for corneal shape control.
- This technology can enhance surgical outcomes in ophthalmology.