Purpose: To describe and evaluate a new multiple regression-derived nomogram for myopic wavefront laser in situ keratomileusis (LASIK).
Setting: Moorfields Eye Hospital, London, United Kingdom.
Design: Prospective comparative case series.
Methods: Multiple regression modeling was used to derive a simplified formula for adjusting attempted spherical correction in myopic LASIK. An adaptation of Thibos' power vector method was then applied to derive adjustments to attempted cylindrical correction in eyes with 1.0 diopter (D) or more of preoperative cylinder. These elements were combined in a new nomogram (nomogram II).
Results: The 3-month refractive results for myopic wavefront LASIK (spherical equivalent ≤11.0 D; cylinder ≤4.5 D) were compared between 299 consecutive eyes treated using the earlier nomogram (nomogram I) in 2009 and 2010 and 414 eyes treated using nomogram II in 2011 and 2012. There was no significant difference in treatment accuracy (variance in the postoperative manifest refraction spherical equivalent error) between nomogram I and nomogram II (P = .73, Bartlett test). Fewer patients treated with nomogram II had more than 0.5 D of residual postoperative astigmatism (P = .0001, Fisher exact test). There was no significant coupling between adjustments to the attempted cylinder and the achieved sphere (P = .18, t test).
Conclusions: Discarding marginal influences from a multiple regression-derived nomogram for myopic wavefront LASIK had no clinically significant effect on treatment accuracy. Thibos' power vector method can be used to guide adjustments to the treatment cylinder alongside nomograms designed to optimize postoperative spherical equivalent results in myopic LASIK. mentioned.
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http://dx.doi.org/10.1016/j.jcrs.2014.08.042 | DOI Listing |
Vestn Oftalmol
December 2024
Krasnov Research Institute of Eye Diseases, Moscow, Russia.
Purpose: This study compares the functional outcomes of correction using two different types of aberrational extended depth-of-focus (EDOF) intraocular lenses (IOLs).
Material And Methods: The study was conducted in two standardized groups (20 patients, 20 eyes in each group). Patients in group 1 were implanted EDOF IOL I, in group 2 - EDOF IOL II.
J Clin Med
November 2024
Ophthalmology Department, LaserVision Ambulatory Eye Surgery Unit, 11521 Athens, Greece.
To report a novel application within the USA of excimer ablation for the normalization of central corneal refractive irregularity, combined with higher fluence CXL in the effective management and visual rehabilitation of progressive keratoconus. 17 consecutive cases with progressive keratoconus were treated with corneal surface excimer laser ablation normalization using topography-guided (Contura) myopic ablation for customized corneal re-shaping with a 6 mm optical zone. The epithelial removal was accounted for by adding a -2.
View Article and Find Full Text PDFPurpose: To compare 6-month visual outcomes and optical quality after small incision lenticule extraction (SMILE) and toric Implantable Collamer Lens (ICL) (STAAR Surgical Company) implantation for high myopia astigmatism.
Methods: This was a prospective non-randomized study. Overall, 88 eyes of 88 patients with high astigmatism (≥ 2.
Purpose: To evaluate the performance of the InnovEyes Sightmap platform (Alcon Laboratories, Inc) in refractive surgery by comparing the visual acuity and higher order aberrations (HOAs) between ray-tracing-guided laser in situ keratomileusis (LASIK) and topography-guided LASIK.
Methods: This prospective study enrolled participants who underwent either ray-tracing-guided LASIK or topography-guided LASIK. Comprehensive ophthalmic evaluations were performed preoperatively, as well as at 1 day, 2 weeks, 1 month, and 3 months postoperatively.
Clin Ophthalmol
November 2024
PersonalEyes, Sydney, NSW, Australia.
Purpose: To assess ocular higher-order aberrations (HOAs) following ray trace guided laser in situ keratomileusis (LASIK).
Methods: Retrospective review at a single-site ophthalmology practice. Two hundred and fifty eyes of 250 patients with myopia and astigmatism undergoing ray trace LASIK were randomly reviewed (Wavelight Plus, Alcon).
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