Results of corneal lenticule extraction for correction

Doga, A.V.; Костенев, С. В.; Mushkova, I. A.; Носиров, П. О.

doi:10.17116/oftalma2020136062214

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…10 The clinical literature on CLEAR is limited to 2 preliminary studies with 1-month follow-up and minimal outcome measures: the first reports only postoperative uncorrected distance visual acuity (UDVA) and corrected distance visual acuity (CDVA) in 5 eyes, 11 and the second reports UDVA in 25 eyes. 12 In both series, the lenticule was separated and extracted using 2 separate 3-mm incisions.…”

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confidence: 99%

Refractive Corneal Lenticule Extraction With the CLEAR Femtosecond Laser Application

Leccisotti

Fields²,

Bartolo³

2022

Cornea

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The aim of this study was to evaluate a new femtosecond laser application for refractive corneal lenticule extraction with suction control and computerized regulation of centration and alignment (Ziemer CLEAR).Methods: This was a retrospective, consecutive, noncomparative case series study. Patients undergoing CLEAR for spherical equivalent (SE) between 23 and 210 D, evaluating SE, defocus equivalent, refractive astigmatism, visual acuity, and centration at 10 months were evaluated in the study.Results: Fifty-three eyes of 42 patients (mean age 40.4 6 8.6 years) were included, with preoperative SE 25.99 6 1.49 D and mean corrected distance visual acuity (CDVA) of 0.05 6 0.07 logMAR. With no suction losses, an intact lenticule was extracted in all eyes. In 6 eyes, peripheral adhesion was resolved by lenticulerrhexis, and in 1 eye, the incision was opened by a crescent blade. Moderate interface inflammation occurred in 3 eyes. At day 1, in the 42 eyes with uneventful surgery, the mean CDVA was 20/27, whereas in the 11 eyes with extra surgical manipulations, it was 20/36 (P= 0.04). At 10 months, for the 53 eyes, the mean uncorrected distance visual acuity was 0.05 6 0.09 logMAR; in 37 eyes (70%), it was 20/25 or better; and the mean CDVA was 0.04 6 0.06 logMAR. Eight eyes (15%) lost 1 logMAR line. The mean SE was 20.13 6 0.15 D. The mean defocus equivalent was 0.33 6 0.32 D, with 46 eyes (87%) #0.50 D and 52 eyes (98%) #1 D. Refractive astigmatism was #0.50 D in 48 eyes (90%). The efficacy index was 1.00, and the safety index was 0.98. The mean decentration from the corneal vertex was 0.28 6 0.07 mm. Conclusions:The application yielded good predictability, efficacy, and safety. Slower visual recovery was observed after extra surgical manipulations.

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confidence: 99%

Refractive Corneal Lenticule Extraction With the CLEAR Femtosecond Laser Application

Leccisotti

Fields²,

Bartolo³

2022

Cornea

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“…A novel RCLE application called CLEAR has recently been launched on the Ziemer Z8 femtosecond laser platform (Ziemer Group, Port), characterized by the combination of low-energy laser pulses at the nanoJoule (nJ) level with high-pulse frequencies (>5 MHz) and computerized control of centration and suction [4]. Only 2 clinical studies on CLEAR have been published so far, evaluating the correction of myopia in virgin corneas [5, 6] but never on eyes previously treated by any laser vision correction technique. We therefore report the first case in which CLEAR was used to correct myopia in an eye that had previously undergone photorefractive keratectomy (PRK), studied with anterior segment optical coherence tomography (AS-OCT).…”

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confidence: 99%

Refractive Corneal Lenticule Extraction on Previous Photorefractive Keratectomy, with Optical Coherence Tomography Study

Leccisotti

Fields²,

Bartolo³

2022

Case Rep Ophthalmol

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We report the first case of refractive corneal lenticule extraction with the femtosecond laser application CLEAR as retreatment technique after previous laser vision correction. A 42-year-old woman, operated by bilateral photorefractive keratectomy (PRK) 19 years previously, with moderate dry eye, came for post-PRK regression and underwent correction of a residual myopia of −3 −0.5 × 159° D in the left eye by CLEAR. Surgery was uneventful, with a regular laser pattern and a normal dissection of the lenticule. At day 1, uncorrected visual acuity was 20/25; at 3 months, it was 20/20, with a refraction of +0.25 × 115° D. The cornea and interface were regular and transparent; no dry eye symptoms occurred. At 3 months, on optical coherence tomography, the treatment was well centered, the surgical interface was centrally regular, whereas the anterior profile of the stromal surface was slightly corrugated, compensated by a smooth epithelial surface. The present case demonstrates that myopia after PRK can be achieved by CLEAR; an irregular stromal surface may occur, not affecting the visual result in virtue of epithelial remodeling.

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“…A modern refractive surgery treatment is the small incision lenticule extraction (SMILE) by VisuMAX (Carl Zeiss Meditec, Jena, Germany) [1,2] as well as SmartSight by SCHWIND ATOS (SCHWIND eye-tech-solutions, Kleinostheim, Germany) [3][4][5][6] and CLEAR by Femto LDV Z8 (Ziemer Ophthalmics, Port, Switzerland) [7][8][9]. All of these treatments are based on the change of refractive power of the cornea due to a lenticule extraction and provide several advantages compared to laser assisted in situ keratomileusis (LASIK) and photorefractive keratectomy (PRK).…”

Section: Introductionmentioning

confidence: 99%

A simple cornea deformation model

Kehrer

Arba-Mosquera

2021

Advanced Optical Technologies

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In this paper, we present a cornea deformation model based on the idea of extending the ‘neutral axis’ model to two-dimensional deformations. Considering this simple model, assuming the corneal tissue to behave like a continuous, isotropic and non-compressible material, we are able to partially describe, e.g., the observed deviation in refractive power after lenticule extraction treatments. The model provides many input parameters of the patient and the treatment itself, leading to an individual compensation ansatz for different setups. The model is analyzed for a reasonable range of various parameters. A semi-quantitative comparison to real patient data is performed.

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Results of corneal lenticule extraction for correction

Cited by 5 publications

References 4 publications

Refractive Corneal Lenticule Extraction With the CLEAR Femtosecond Laser Application

Refractive Corneal Lenticule Extraction With the CLEAR Femtosecond Laser Application

Refractive Corneal Lenticule Extraction on Previous Photorefractive Keratectomy, with Optical Coherence Tomography Study

A simple cornea deformation model

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