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A steep peripheral ring in irregular cornea topography, real or an instrument error?
Alicia Galindo-Ferreiro1, Alberto Galvez-Ruiz2, Silvana A Schellini3
1King Khaled Eye Specialist Hospital, Al Urubah Branch Rd, Umm Al Hamam Al Gharbi, Riyadh 12329, Saudi Arabia; Department of Ophthalmology, Complejo Asistencial Palencia, Donantes de sangre s/n, 34005 Palencia, Spain.
Corneal topography red zones after myopic laser in situ keratomileusis (LASIK) may be instrument error, not always increased corneal curvature. This study suggests plotting algorithm artifacts can create these visual discrepancies.
Area of Science:
- Ophthalmology
- Optometry
- Biomedical Engineering
Background:
- Laser in situ keratomileusis (LASIK) is a common refractive surgery.
- Corneal topography is used to map the eye's surface.
- Post-LASIK changes can include apparent increases in corneal curvature.
Purpose of the Study:
- To investigate if the peripheral red zone on corneal topography post-myopic LASIK is an artifact.
- To differentiate between true corneal curvature increase and instrument error.
Main Methods:
- Utilized a spherical corneal model.
- Modified topography software of a commercial topographer.
- Analyzed instrument design errors.
Main Results:
- A minor modification to topography images produced a red zone.
- Corneal modeling suggested the red zone can be instrument-induced.
Conclusions:
- The red zone in post-LASIK topography may be an artifact.
- Plotting algorithms of corneal topographers can contribute to this artifactual representation of steep curvature.
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