Use of a pulsed picosecond Nd: YAG laser in 6,664 cases

Aron-Rosa, D; Aron, Jean-Jacques; Cohn, H

doi:10.1016/s0146-2776(84)80074-9

Cited by 57 publications

(8 citation statements)

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“…All our patients underwent capsulotomy with the complaint of DOV. Aron-Rosa et al27 reported an immediate improvement in visual acuity in 94% of cases treated by capsulotomy. In a review by Weiblinger et al,28 overall visual acuity improved in 83–94% and decreased in 3.5–6% of cases.…”

Section: Discussionmentioning

confidence: 97%

<p>Effect of Nd:YAG laser posterior capsulotomy on intraocular pressure, refraction, anterior chamber depth, and macular thickness</p>

Parajuli¹,

Joshi²,

Subedi³

et al. 2019

OPTH

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Purpose: To see the effect of Nd:YAG laser capsulotomy on intraocular pressure (IOP), refraction, best-corrected visual acuity (BCVA), anterior chamber depth (ACD), and macular thickness. Methodology: The authors conducted a prospective, descriptive study on pseudophakic eyes with posterior capsule opacification who underwent Nd:YAG laser capsulotomy. BCVA, IOP, spherical equivalent (SE), macular thickness, and ACD were noted preoperatively, at 1 hr postoperatively and at 1-month follow-up. Patients were divided into two groups based on energy used (Group I ≤50 mJ, Group II >50 mJ). None of the patients received prophylactic antiglaucoma medications either before or after the procedure. Results: There were 96 eyes of 83 patients. Mean total energy levels were 26.64±12.92 mJ in Group I and 81.96±32.10 mJ in Group II. BCVA at 1 hr and 1 month postoperatively improved significantly in both the groups compared to preoperative BCVA ( P <0.001). There was no significant change in SE compared to preoperative values in both the groups. The ACD continued to increase significantly in both the groups at both 1 hr and 1-month follow-up. In Group I, IOP increased at 1 hr postoperatively ( P =0.023) and declined to preoperative levels at 1 month. In Group II, IOP increased at 1 hr postoperatively ( P <0.001) and did not return to preoperative levels at 1-month follow-up ( P =0.003). Likewise, macular thickness increased at 1 hr in both groups ( P <0.001). In Group I, macular thickness decreased significantly to preoperative level at 1 month whereas in Group II, it remained significantly high at 1-month follow-up ( P =0.006). There was no case with serious rise in IOP or cystoid macular edema. Conclusion: Statistically significant increment in IOP and macular thickness occurs after Nd:YAG laser capsulotomy which however may not necessitate the use of any medications.

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Section: Discussionmentioning

confidence: 97%

<p>Effect of Nd:YAG laser posterior capsulotomy on intraocular pressure, refraction, anterior chamber depth, and macular thickness</p>

Parajuli¹,

Joshi²,

Subedi³

et al. 2019

OPTH

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“…We aimed the size of the capsulotomy to be greater than 4.0 mm in the horizontal and vertical direction (see Figure 2 , middle image). According to the previous studies and recommendations [ 12 – 17 ] to use rather lower single-pulse energy even in return of higher total-pulse energy, we used the single-pulse energy just above the threshold for optical breakdown of our laser system. All the procedures were successfully finished with the same single-pulse energy, E p = 1.6 mJ.…”

Section: Methodsmentioning

confidence: 99%

“…This procedure involves focusing a Nd:YAG laser pulse, with an energy of several millijoules and a duration of several nanoseconds, immediately behind the PC. Previous studies [ 12 – 17 ] have reported that the side effects are more pronounced when higher single-pulse energy, rather than higher total-pulse energy, is used. To avoid unwanted IOL damage, these studies all proposed that the Nd:YAG laser posterior capsulotomy should be performed with the lowest possible single-pulse energy.…”

Section: Introductionmentioning

confidence: 99%

Optical coherence tomography for an in-vivo study of posterior-capsule-opacification types and their influence on the total-pulse energy required for Nd:YAG capsulotomy: a case series

et al. 2014

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BackgroundPosterior capsule opacification (PCO) is the most common post-operative complication associated with cataract surgery and is mostly treated with Nd:YAG laser capsulotomy. Here, we demonstrate the use of high-resolution spectral-domain optical coherence tomography (OCT) as a technique for PCO analysis. Additionally, we evaluate the influence of PCO types and the distance between the intraocular lens (IOL) and the posterior capsule (PC), i.e., the IOL/PC distance, on the total-pulse energy required for the Nd:YAG laser posterior capsulotomy.Methods47 eyes with PCO scheduled for the Nd:YAG procedure were examined and divided into four categories: fibrosis, pearl, mixed type and late-postoperative capsular bag distension syndrome. Using custom-made computer software for OCT image analysis, the IOL/PC distances in two dimensions were measured. The IOL/PC distances were compared with those of a control group of 15 eyes without PCO. The influence of the different PCO types and the IOL/PC distance on the total-pulse energy required for the Nd:YAG procedure was analyzed.ResultsThe total-pulse energy required for a laser capsulotomy differs significantly between PCO types (p = 0.005, Kruskal-Wallis test). The highest energy was required for the fibrosis PCO type, followed by mixed, pearl and late-postoperative capsular bag distension syndrome. The IOL/PC distance also significantly influenced the total-pulse energy required for laser capsulotomy (p = 0.028, linear regression). Lower total-pulse energy was expected for a larger IOL/PC distance.ConclusionsOur study indicates that the PCO types and the IOL/PC distance influence the total-pulse energy required for Nd:YAG capsulotomy. The presented OCT method has the potential to become an additional tool for PCO characterization. Our results are important for a better understanding of the photodisruptive mechanisms in Nd:YAG capsulotomy.

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“…Hossain et al 20 reported an 80% improvement in visual acuity. Likewise, Terry et al 21 and Aron-Rosa et al 22 reported visual improvement in 92%, and 94% of their cohorts, respectively. Regarding the changes in the spherical refractive error, several studies had reported that the change in the spherical error after YAG-PC was statistically insignificant, 20,[23][24][25] in agreement with our results in the non-FECD group.…”

Section: Discussionmentioning

confidence: 88%

Short-Term Anterior Segment Changes After Nd-YAG Laser Posterior Capsulotomy in Pseudophakic Eyes with Fuchs’ Endothelial Dystrophy

Eleiwa

Khedr

Fayek

et al. 2021

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Purpose To describe the changes in the central corneal thickness (CCT), endothelial cell count (ECC), intraocular lens (IOL) position, and refractive error 1 and 3 months after Nd-YAG laser posterior capsulotomy (YAG-PC) for posterior capsular opacification (PCO) in pseudophakic eyes with Fuchs’ endothelial cell dystrophy (FECD). Design Prospective case-control. Participants Fifty pseudophakic eyes of 50 patients with visually significant PCO (25 with healthy corneas, and 25 with FECD grade 1 and 2). Methods FECD was clinically graded, and only patients without clinically evident corneal edema were included in the study (grade 1 and 2). All patients received YAG-PC and were followed up after 1 and 3 months. Best-corrected visual acuity, refractive errors, ACD, CCT, and ECC were assessed and compared between the pre-laser values and that of the 2 follow-up visits. Results In both groups, BCVA showed significant improvement (P<0.05). Compared to healthy controls, a significant hyperopic shift was observed in the FECD eyes at the 2 follow-up visits (P=0.027, and 0.019). A significant backward movement of the IOL was observed in the FECD eyes in the 2 follow-up visits (P=0.043, and 0.02). There was a significant correlation between the hyperopic shift in the FECD eyes and the ACD deepening during the 1st month (R= −0.6, P=0.001) and 3rd month (R= −0.4, P=0.04). Significant drop in the ECC was noted in both groups but without significant increase in the CCT. Conclusion Compared to controls, a hyperopic shift and backward movement of the IOL were observed in the FECD eyes after YAG-PC. No significant corneal thickening was found in both groups despite the significant drop in the ECC. Future studies are required to confirm our results and monitor the long-term changes after YAG-PC in FECD.

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Use of a pulsed picosecond Nd: YAG laser in 6,664 cases

Cited by 57 publications

References 0 publications

<p>Effect of Nd:YAG laser posterior capsulotomy on intraocular pressure, refraction, anterior chamber depth, and macular thickness</p>

<p>Effect of Nd:YAG laser posterior capsulotomy on intraocular pressure, refraction, anterior chamber depth, and macular thickness</p>

Optical coherence tomography for an in-vivo study of posterior-capsule-opacification types and their influence on the total-pulse energy required for Nd:YAG capsulotomy: a case series

Short-Term Anterior Segment Changes After Nd-YAG Laser Posterior Capsulotomy in Pseudophakic Eyes with Fuchs’ Endothelial Dystrophy

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