Comparing surgically induced astigmatism calculated by means of simulated keratometry versus total corneal refractive power
| Autor: | David Carmona, Carlos Palomino, Miguel Á Zato-Gómez de Liaño, Manuel Rodríguez-Vallejo, Joaquín Fernández, Jorge A Calvo-Sanz, Nuria Garzón, Francisco Poyales |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Male
medicine.medical_specialty medicine.medical_treatment Optical power Astigmatism Refraction Ocular law.invention Cornea 03 medical and health sciences 0302 clinical medicine Lens Implantation Intraocular law Cirugía Ophthalmology Optometría Medicine Humans Prospective Studies Aged Phacoemulsification Keratometer business.industry Corneal Topography General Medicine cataract surgery Multifocal intraocular lens Cataract surgery Middle Aged medicine.disease Multifocal Intraocular Lenses multifocal intraocular lens surgically induced astigmatism 030221 ophthalmology & optometry Oftalmología Surgically induced astigmatism Female business posterior cornea 030217 neurology & neurosurgery |
| Zdroj: | E-Prints Complutense: Archivo Institucional de la UCM Universidad Complutense de Madrid E-Prints Complutense. Archivo Institucional de la UCM instname |
| Popis: | Purpose: To evaluate surgically induced astigmatism as computed by means of either simulated keratometry (KSIM) or total corneal refractive power (TCRP) after temporal incisions. Methods: Prospective observational study including 36 right eyes undergoing cataract surgery. Astigmatism was measured preoperatively during the 3-month follow-up period using Pentacam. Surgically induced astigmatism was computed considering anterior corneal surface astigmatism at 3 mm with KSIM and considering both corneal surfaces with TCRP from 1 to 8 mm (TCRP3 for 3 mm). The eyes under study were divided into two balanced groups: LOW with KSIM astigmatism SIM astigmatism ≥0.90 D. Resulting surgically induced astigmatism values were compared across groups and measuring techniques by means of flattening, steepening, and torque analysis. Results: Mean surgically induced astigmatism was higher in the HIGH group (0.31 D @ 102°) than in the LOW group (0.04 D @ 16°). The temporal incision resulted in a steepening in the HIGH group of 0.15 D @ 90°, as estimated with KSIM, versus 0.28 D @ 90° with TCRP3, but no significant differences were found for the steepening in the LOW group or for the torque in either group. Differences between KSIM- and TCRP3-based surgically induced astigmatism values were negligible in LOW group. Conclusion: Surgically induced astigmatism was considerably higher in the high-astigmatism group and its value was underestimated with the KSIM approach. Eyes having low astigmatism should not be included for computing the surgically induced astigmatism because steepening would be underestimated. |
| Databáze: | OpenAIRE |
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