Impact of a Displaced Corneal Apex in Small Incision Lenticule Extraction

Journal of Refractive Surgery
Gernot SteinwenderAndreas Wedrich

Abstract

To evaluate the possible impact of a displaced corneal apex (point of maximum curvature) on visual results and tomographic parameters after small incision lenticule extraction (SMILE). In this retrospective evaluation, eyes with uncomplicated SMILE for myopia correction were classified in two groups based on their preoperative distance between the corneal apex and corneal vertex (corneal intercept with the patient's line of sight) of 1 mm or greater (large A-V distance) or less than 1 mm (small A-V distance). All surgeries were performed during the early learning curve of two surgeons. Visual outcome parameters included uncorrected (UDVA) and corrected (CDVA) distance visual acuity, manifest refractive spherical equivalent (MRSE), and refractive astigmatism 3 months postoperatively. Scheimpflug-derived tomographic outcome parameters included mean keratometry value, root mean square higher order aberrations (RMS HOAs), and optical zone decentration. The study comprised 94 eyes of 48 patients: 44 eyes in the large A-V distance group and 50 eyes in the small A-V distance group. Preoperative and postoperative RMS HOAs were significantly higher in the large A-V distance group than in the small A-V distance group (P = .002 and .008, ...Continue Reading

References

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Dec 25, 2010·Journal of Cataract and Refractive Surgery·Rupal ShahSayantan Sengupta
May 10, 2012·Current Opinion in Ophthalmology·Choul Yong ParkRoy S Chuck
Sep 18, 2012·Journal of Cataract and Refractive Surgery·Anders VestergaardJesper Ø Hjortdal
Dec 13, 2012·Journal of Refractive Surgery·Jesper Ø HjortdalSven Asp
Mar 22, 2014·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Walter SekundoIgor Solomatin
Apr 8, 2014·Journal of Refractive Surgery·Fangyu LinYabo Yang
Mar 10, 2015·Journal of Refractive Surgery·Anastasios John Kanellopoulos, George Asimellis
Mar 26, 2015·Journal of Cataract and Refractive Surgery·Majid MoshirfarCarlton R Fenzl
Oct 8, 2015·Journal of Refractive Surgery·Iben Bach PedersenJesper Hjortdal
Nov 26, 2015·Eye and Vision·Samuel Arba MosqueraColm McAlinden
Apr 14, 2016·Journal of Refractive Surgery·Yingjie ZhangJibo Zhou
May 10, 2017·Journal of Refractive Surgery·Mounir A KhalifaDavid P Piñero

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Citations

Oct 6, 2019·Journal of Cataract and Refractive Surgery·Valerie SchmelterNikolaus Luft

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Software Mentioned

Pentacam
SMILE
SPSS

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