A steep peripheral ring in irregular cornea topography, real or an instrument error?

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dc.contributor.authorGalindo-Ferreiro, Alicia
dc.contributor.authorGalvez-Ruiz, Alberto
dc.contributor.authorSchellini, Silvana A. [UNESP]
dc.contributor.authorGalindo-Alonso, Julio
dc.contributor.institutionKing Khaled Eye Specialist Hospital
dc.contributor.institutionComplejo Asistencial Palencia
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionGalindo Clinic
dc.contributor.institutionRio Hortega University Hospital
dc.date.accessioned2018-12-11T17:07:24Z
dc.date.available2018-12-11T17:07:24Z
dc.date.issued2016-07-01
dc.description.abstractPurpose To demonstrate that the steep peripheral ring (red zone) on corneal topography after myopic laser in situ keratomileusis (LASIK) could possibly due to instrument error and not always to a real increase in corneal curvature. Methods A spherical model for the corneal surface and modifying topography software was used to analyze the cause of an error due to instrument design. This study involved modification of the software of a commercially available topographer. Results A small modification of the topography image results in a red zone on the corneal topography color map. Conclusion Corneal modeling indicates that the red zone could be an artifact due to an instrument-induced error. The steep curvature changes after LASIK, signified by the red zone, could be also an error due to the plotting algorithms of the corneal topographer, besides a steep curvature change.en
dc.description.affiliationKing Khaled Eye Specialist Hospital, Al Urubah Branch Rd, Umm Al Hamam Al Gharbi
dc.description.affiliationDepartment of Ophthalmology Complejo Asistencial Palencia, Donantes de sangre s/n
dc.description.affiliationDepartment of Ophthalmology Faculdade de Medicina de Botucatu – UNESP
dc.description.affiliationGalindo Clinic, Francisco Zarandona St 10
dc.description.affiliationRio Hortega University Hospital, Dulzaina St 2
dc.description.affiliationUnespDepartment of Ophthalmology Faculdade de Medicina de Botucatu – UNESP
dc.format.extent175-179
dc.identifierhttp://dx.doi.org/10.1016/j.sjopt.2016.04.002
dc.identifier.citationSaudi Journal of Ophthalmology, v. 30, n. 3, p. 175-179, 2016.
dc.identifier.doi10.1016/j.sjopt.2016.04.002
dc.identifier.file2-s2.0-84993984951.pdf
dc.identifier.issn1319-4534
dc.identifier.scopus2-s2.0-84993984951
dc.identifier.urihttp://hdl.handle.net/11449/173711
dc.language.isoeng
dc.relation.ispartofSaudi Journal of Ophthalmology
dc.relation.ispartofsjr0,451
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectIrregular corneal astigmatism
dc.subjectRed zone
dc.subjectSpherical aberration
dc.subjectTopography
dc.titleA steep peripheral ring in irregular cornea topography, real or an instrument error?en
dc.typeArtigo

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