Long-Term Followup of Laser<i>In Situ</i>Keratomileusis for Hyperopia Using a 213 nm Wavelength Solid-State Laser

Quito, Carmina Franz G.; Agahan, Archimedes Lee D; Evangelista, Raymond P.

doi:10.1155/2013/276984

Cited by 18 publications

(13 citation statements)

References 25 publications

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“…The spherical equivalent (SE) predictability outcomes obtained in this investigation were similar to previous studies. 6,18–20 The spherical equivalent stability shows a change of more than 0.50 D in 33% of cases between 3 and 36 months after surgery and in 22% between 12 and 36 months after surgery; these results are in concordance with those of previous studies. 6 These outcomes could be influenced by the increase of the hyperopia related to the changes in accommodation with age.…”

Section: Discussionsupporting

confidence: 89%

Stability of corneal topography and aberrometry after hyperopic laser in situ keratomileusis with a 500-Hz excimer laser platform: A 3-year follow-up study

Plaza-Puche

Vargas

Yébana

et al. 2019

European Journal of Ophthalmology

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Purpose: The aim of this study is to analyze the long-term stability of the corneal topography, the functional optical zone, and the refractive stability throughout 3 years following laser in situ keratomileusis surgery for hyperopia using a 500-Hz excimer laser system. Methods: This retrospective consecutive observational case series study comprised 66 eyes that underwent laser in situ keratomileusis to correct hyperopia with a postoperative follow-up of 3 years. Laser in situ keratomileusis procedures were performed using the SCHWIND Amaris 500-Hz excimer laser. Main outcomes measured were stability of the functional optical zone at corneal topography and corneal aberrometry. Results: Statistically significant differences were found in simulated keratometry (K2 (steep meridian) and Km (mean keratometry)) between 3 and 36 months postoperatively ( p ⩽ 0.01); these differences disappeared at 12 and 36 months ( p ⩾ 0.18). No statistically significant changes were observed in the horizontal and vertical diameter of the functional optical zone throughout the whole follow-up ( p ⩾ 0.07). A statistically significant difference was found in the spherical aberration between 3 and 36 months ( p = 0.02); this difference disappeared when compared between 12 and 36 months ( p = 0.72). Statistically significant correlations were detected between the vertical functional optical zone and coma root mean square ( r = –0.510, p < 0.01) and between the vertical functional optical zone and spherical aberration ( r = 0.441, p = 0.02) 36 months after surgery. Conclusion: Following 3 years of hyperopic laser in situ keratomileusis with a 500-Hz Amaris excimer laser, keratometry, functional optical zone, and corneal aberrations remain stable from 1 year after surgery. Topographical regression is not observed in hyperopic laser in situ keratomileusis with this excimer laser technology from 1 year after surgery.

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Section: Discussionsupporting

confidence: 89%

Stability of corneal topography and aberrometry after hyperopic laser in situ keratomileusis with a 500-Hz excimer laser platform: A 3-year follow-up study

Plaza-Puche

Vargas

Yébana

et al. 2019

European Journal of Ophthalmology

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“…Adjunctive use of Mitomycin C with PRK after primary LASIK has been shown to be effective and safe using 193 nm excimer lasers. With the development and growing use of the 213 nm solid-state laser, published studies [ 12 – 14 ] have suggested that despite the known differences in their ablation characteristics, clinical results in efficacy and safety have been comparable. In a study by Sanders et al, the authors showed that cellular responses after irradiation with 213 nm compared with 193 nm wavelengths are consistent with good clinical outcomes [ 11 ].…”

Section: Discussionmentioning

confidence: 99%

Photorefractive Keratectomy with Adjunctive Mitomycin C for Residual Error after Laser-Assisted In Situ Keratomileusis Using the Pulzar 213 nm Solid-State Laser: Early Results

Ng-Darjuan¹,

Evangelista²,

Agahan

2013

ISRN Ophthalmology

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Purpose. To evaluate the accuracy, efficacy, stability, and safety of photorefractive keratectomy (PRK) enhancement using the Pulzar 213 nm solid-state laser (SSL) with adjunctive Mitomycin C in eyes previously treated with laser assisted in situ keratomileusis (LASIK) with residual error of refraction. Methods. This is a prospective noncomparative case series of 16 eyes of 12 patients who underwent PRK for residual refractive error after primary LASIK. Mitomycin C 0.02% was used after the PRK to prevent haze formation. Outcomes measured were pre- and postoperative manifest refraction spherical equivalent (MRSE), uncorrected (UDVA) and best-corrected distance visual acuity (CDVA), and slit lamp evidence of corneal complications. Results. The mean UDVA improved from 20/70 preoperatively to 20/30 postoperatively. The average gain in lines for the UDVA was 2.38. After six months of followup, the postoperative MRSE within 0.50 D in 56% (9) of eyes and 94% (15) eyes were within 1.0 diopters of the intended correction. No eyes developed haze all throughout the study. Conclusion. PRK enhancement with adjunctive use of Mitomycin C for the correction of residual error of refraction after LASIK using the Pulzar 213 nm solid-state laser is an accurate, effective, and safe procedure.

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“…We plan to report the outcomes over a longer period, because some studies found average increase in hyperopia +0,54 over 5 years postoperatively, which is more than expected physiologically and can be indicator of destabilization of cornea after LASIK (20).…”

Section: Discussionmentioning

confidence: 99%

Lasik as a Solution for High Hypermetropia

Biščević¹,

Pidro²,

Pjano³

et al. 2019

Med Arch

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Aim: To evaluate safety and efficacy of Laser in situ Keratomileusis (LASIK) procedure for the correction of high hypermetropia. Methods: Retrospective study of 160 patients (266 eyes) who underwent LASIK procedure for the correction of hypermetropia between +3.00 and +7.00 diopters(D) and cylinder up to 2.00D from January 2013 and August 2015. All ablations were performed with Wavelight Allegretto Eye-Q400Hzexcimer laser (Alcon, Forth Worth, TX, USA) with aberration free module and were centered on a corneal vertex. All flaps were made with Moria M2 (Moria, Antony, France) mechanical microkeratome (90μm head). Preoperative and postoperative uncorrected and corrected distant visual acuity (UDVA, CDVA), spherical equivalent (SE) and a berrometry for 5mm pupil were measured. Measurements were taken at 1 week, 1,3,6 and 12 months after the surgery. Wilcoxon Signed Ranks Test was used for statistical analysis. Results: Postoperative UDVA was lower than preoperative CDVA at 1 week( p =0.001), at 1 month there was no difference ( p =0.099), and at 3,6 and 12 months UDVA was better ( p <0.0001). Preoperative SE was 4.69±1.20D (+3.75 to +7.50D). At 1 week SE was 0.03±0.67D (-0.50 to +0.63D), while at 1 year regressed to 0.58±0.56D (+0.25 to +0.88D). Sphere shifted from negative values targeted in treatment planning to compensate for regression to positive values. There was significant difference in SE at every time point ( p <0.0005). There was a significant increase in coma ( p <0.0001), trefoil ( p <0.0001, p =0.0006) and spherical aberration ( p =0.022, p =0.0052) at 1 week and 1 month postoperatively, without change throughout the rest of follow up. Conclusion: LASIK for high hypermetropia showed satisfactory results in postoperative refraction with reasonable regression without significant loss of lines of visual acuity. However, more test are necessary to asses optical quality.

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Long-Term Followup of LaserIn SituKeratomileusis for Hyperopia Using a 213 nm Wavelength Solid-State Laser

Cited by 18 publications

References 25 publications

Stability of corneal topography and aberrometry after hyperopic laser in situ keratomileusis with a 500-Hz excimer laser platform: A 3-year follow-up study

Stability of corneal topography and aberrometry after hyperopic laser in situ keratomileusis with a 500-Hz excimer laser platform: A 3-year follow-up study

Photorefractive Keratectomy with Adjunctive Mitomycin C for Residual Error after Laser-Assisted In Situ Keratomileusis Using the Pulzar 213 nm Solid-State Laser: Early Results

Lasik as a Solution for High Hypermetropia

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