Corneal Thickness After SMILE Affects Scheimpflug-based Dynamic Tonometry
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http://hdl.handle.net/10045/65315
Title: | Corneal Thickness After SMILE Affects Scheimpflug-based Dynamic Tonometry |
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Authors: | Fernández, Joaquín | Rodríguez-Vallejo, Manuel | Martínez, Javier | Tauste Francés, Ana | Piñero, David P. |
Research Group/s: | Grupo de Óptica y Percepción Visual (GOPV) |
Center, Department or Service: | Universidad de Alicante. Departamento de Óptica, Farmacología y Anatomía |
Keywords: | Corneal thickness | Small incision lenticule extraction (SMILE) | Scheimpflug-based dynamic tonometry |
Knowledge Area: | Óptica |
Issue Date: | Dec-2016 |
Publisher: | SLACK Incorporated |
Citation: | Journal of Refractive Surgery. 2016, 32(12): 821-828. doi:10.3928/1081597X-20160816-02 |
Abstract: | PURPOSE: To evaluate the corneal biomechanical changes due to small incision lenticule extraction (SMILE) measured by Scheimpflug-based dynamic tonometry and to assess the impact of the corneal thickness. METHODS: Sixty-eight patients measured with the Corvis ST (Oculus Optikgeräte GmbH, Wetzlar, Germany) preoperatively and 1 month after SMILE were included in this retrospective observational study. Patients were divided into three groups depending on the preoperative spherical equivalent: low from -1.00 to -3.00 diopters (D), medium from -3.25 to -5.00 D, and high from -5.25 to -7.25 D. Changes in Corvis ST parameters due to the surgery were analyzed and new indexes for correcting the impact of corneal thickness were proposed. RESULTS: First and second applanation times changed after SMILE (P < .0001) but no differences were found in the comparison between these relative changes (P = .31). First applanation time was correlated with central corneal thickness (r = 0.368, P = .002) but not second applanation time (r = -0.149, P = .23). The change in first applanation time due to SMILE was different among myopic groups (P = .007) but equal when a new index that considers the removed central corneal thickness was used for comparison (P = .31). Deformation amplitude was also increased after SMILE (P < .0001), but after subtracting the removed corneal thickness from the postoperative deformation amplitude the result was equal to the preoperative deformation amplitude (P = .26). CONCLUSIONS: SMILE produces significant changes in the Corvis ST parameters of time and deformation amplitude, but these changes are mainly explained by the confounding variable of corneal thickness. |
URI: | http://hdl.handle.net/10045/65315 |
ISSN: | 1081-597X (Print) | 1938-2391 (Online) |
DOI: | 10.3928/1081597X-20160816-02 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © SLACK Incorporated |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.3928/1081597X-20160816-02 |
Appears in Collections: | INV - GOPV - Artículos de Revistas |
Files in This Item:
File | Description | Size | Format | |
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2016_Fernandez_etal_JRefractSurg_final.pdf | Versión final (acceso restringido) | 232,03 kB | Adobe PDF | Open Request a copy |
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