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1.
J Cataract Refract Surg ; 50(5): 498-504, 2024 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-38651697

RESUMO

PURPOSE: To compare 3 capsulotomy centration methods. SETTING: Private clinic, Zlin, Czech Republic. DESIGN: Prospective, consecutive case series. METHODS: 180 eyes undergoing cataract surgery had anterior capsule staining with microfiltered 0.4% trypan blue solution before selective laser capsulotomy. The first 60 eyes (Group 1) had mydriatic dilated pupil centered capsulotomies. The next 60 eyes (Group 2) were centered on the trypan blue central landmark (TCL). The final 60 capsulotomies (Group 3) were centered on the patient fixated coaxial Purkinje reflex (CPR). Measurements between key anatomical landmarks and the TCL, CPR capsulotomies, and implanted intraocular lens (IOL) center were made. RESULTS: The TCL, observed in >94% of eyes in the study, coincided with the CPR with a displacement of <0.1 ± 0.1 mm. Group 1 capsulotomies were noticeably decentered on the IOLs by 0.3 ± 0.2 mm. The Group 2 symmetrical IOL relationship was maintained with a decentration of 0.15 ± 0.1 mm. Group 3 had a similar decentration with the IOLs with 0.15 ± 0.1 mm. Verification with IOLMaster 700 data and CALLISTO Eye System showed that the CPR and the TCL were coincident with the measured visual axis. CONCLUSIONS: The clearly visible TCL served as an alternate landmark to the patient fixated CPR, and being on the anterior capsule was not sensitive to tilt. Further patient compliance was not required. Both were superior to dilated pupil centration, to achieve symmetric IOL coverage. This has application for both capsulotomies and capsulorhexes.


Assuntos
Capsulorrexe , Corantes , Facoemulsificação , Azul Tripano , Humanos , Capsulorrexe/métodos , Estudos Prospectivos , Idoso , Corantes/administração & dosagem , Implante de Lente Intraocular , Masculino , Feminino , Pessoa de Meia-Idade , Cápsula Anterior do Cristalino/cirurgia , Pontos de Referência Anatômicos , Cápsula do Cristalino/cirurgia , Idoso de 80 Anos ou mais
2.
J Cataract Refract Surg ; 50(6): 599-604, 2024 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-38270489

RESUMO

PURPOSE: To investigate the effect of anterior capsule polishing on postoperative capsule opacification and capsular bend in patients with age-related cataract displaying normal axial length. SETTING: Eye Hospital of Wenzhou Medical University at Hangzhou. DESIGN: Prospective self-controlled trial. METHODS: Patients with age-related cataracts aged 56 to 84 years displaying normal axial length were enrolled. Before surgery, a coin-toss method was used to randomly select 1 eye for intraoperative 360 degrees anterior capsule polishing (polishing group); the contralateral eye received no treatment (control group). Capsular bend index (CBI), anterior capsule opacification (ACO), posterior capsule opacification (PCO), and anterior capsule opening area (ACOA) were recorded at 1 week, 1 month, 3 months, 6 months, and 12 months postoperatively using swept-source optical coherence tomography and slitlamp examination. RESULTS: 21 patients (42 eyes) were enrolled. Within-group comparisons showed that both groups had significant differences in CBI between 1 week and 1 month postoperatively, and between 6 months and 12 months postoperatively ( P < .05). Between-group comparisons revealed a significant difference in CBI at 1 week postoperatively ( P < .05); at 12 months postoperatively, there was a significant difference in ACOA ( P < .05). There were no significant between-group differences regarding ACO or PCO at any timepoint ( P > .05). CONCLUSIONS: For patients with age-related cataracts and normal axial length, 360 degrees anterior capsule polishing can delay early capsular bag deformation without increasing the risks of ACO and PCO. This approach can also limit contraction of the anterior capsule opening.


Assuntos
Cápsula Anterior do Cristalino , Opacificação da Cápsula , Facoemulsificação , Tomografia de Coerência Óptica , Humanos , Opacificação da Cápsula/prevenção & controle , Estudos Prospectivos , Idoso , Pessoa de Meia-Idade , Idoso de 80 Anos ou mais , Masculino , Feminino , Cápsula Anterior do Cristalino/cirurgia , Facoemulsificação/métodos , Tomografia de Coerência Óptica/métodos , Complicações Pós-Operatórias/prevenção & controle , Acuidade Visual/fisiologia , Implante de Lente Intraocular , Cápsula do Cristalino/cirurgia , Cápsula do Cristalino/patologia , Catarata , Capsulorrexe/métodos
3.
Eur J Ophthalmol ; 33(4): 1746-1749, 2023 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-36799549

RESUMO

PURPOSE: To report how to manage and prevent the incomplete laser cut and following uncut tags of anterior capsular lens, performed using the selective laser capsulotomy. METHODS: We describe three possible approaches: peeling the anterior capsulotomy disc with forceps, breaking the tags using the cystotomy needle tip, or cutting them using a 23-G vitrectomy scissors. RESULTS: Using the 23-G vitrectomy scissors resulted in no complication. Peeling the anterior capsulotomy using the forceps instead caused zonular stress with subsequent risks of zonular dialysis, whereas using the cystotomy needle tip resulted in irregular capsulotomy rim and weakness all along the capsulotomy edge where micro tears caused a tear during the rest of cataract surgery. CONCLUSION: Incomplete laser cut and subsequent discontinuous capsulotomy results in the presence of multiple tags which create strong adherence between the central capsulotomy disc and the peripheral capsule. Key steps of the procedure to prevent an incomplete laser cut, which are the anterior lens capsule staining and laser beam focusing, and how to correctly manage them, which may shorten the learning curve and enhance the outcomes.


Assuntos
Cápsula Anterior do Cristalino , Extração de Catarata , Terapia a Laser , Humanos , Capsulorrexe/métodos , Terapia a Laser/métodos , Extração de Catarata/efeitos adversos , Extração de Catarata/métodos , Cápsula Anterior do Cristalino/cirurgia , Lasers
4.
Lasers Med Sci ; 37(3): 1891-1897, 2022 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-34713366

RESUMO

BACKGROUND: In this study, the tear resistance of porcine lens capsules after continuous curvilinear capsulorhexis (CCC) and femtosecond (fs)-laser-assisted capsulotomy for cataract surgery (FLC) with different laser parameters is measured with a custom-made testing setup. METHODS: Forty-five fresh porcine lenses were randomly chosen for CCC (n = 15) or FLC 1 (n = 15) and FLC 2 (n = 15). The FLC 1-group was treated with smaller spot distances than the FLC 2-group. The force necessary to break the opening of the anterior capsule and the maximum displacement were measured. RESULTS: The mean tear resistance of the CCC-group (150 ± 70 mN) was higher than that of the FLC 1-group (60 ± 20 mN) and the FLC 2-group (30 ± 20 mN). CONCLUSION: It could be shown that CCC leads to a significantly higher tear resistance of the opening than FLC in porcine lenses. The femtosecond laser group demonstrated that smaller spot distances lead to a higher tear resistance.


Assuntos
Cápsula Anterior do Cristalino , Extração de Catarata , Terapia a Laser , Animais , Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe , Lasers , Suínos
6.
Am J Ophthalmol ; 225: 27-37, 2021 05.
Artigo em Inglês | MEDLINE | ID: mdl-33412122

RESUMO

PURPOSE: To evaluate stability and performance of a new monofocal anterior capsulotomy-fixated intraocular lens (IOL) (FEMTIS; Teleon Surgical B.V., Spankeren, Netherlands) after femtosecond laser-assisted cataract surgery (FLACS). DESIGN: Prospective, multicenter, interventional, noncomparative case series. METHODS: FLACS with FEMTIS IOL was performed in 336 eyes of 183 cataract patients with fixation of the IOL to the anterior capsulotomy followed up for 12 months. Examination included uncorrected distance visual acuity (UDVA), best-corrected visual acuity (CDVA), subjective refraction, IOL centration, posterior capsule opacification (PCO), and investigators' satisfaction questionnaire. RESULTS: At 12 months, mean IOL rotation was 1.50 ± 1.76 degrees and decentration 0.14 ± 0.14 mm from baseline (day of surgery). Mean horizontal IOL tilt was 0.70 ± 0.60 degrees and vertical 1.15 ± 1.06 degrees relative to the baseline (crystalline lens). Mean distance between IOL and iris was 0.32 mm to 0.36 mm for all measured meridians. Mean UDVA was 0.12 ± 0.14 logMAR (range -0.20 to 0.54 logMAR), mean CDVA -0.01 ± 0.09 logMAR (range -0.30 to 0.20 logMAR). Mean spherical equivalent was 0.35 ± 0.53 diopter (D) and 98% of eyes (n = 235) were within ±1.0 D. Median PCO score was 1 with an Nd:YAG laser rate of 3.1% after 12 months. Most surgeons were very satisfied (median score: 1) with surgery and implanted IOL. CONCLUSIONS: Implantation of FEMTIS IOL provided excellent visual and stable refractive outcomes. IOL decentration was very low compared to other published studies and showed an exceptional high in-the-bag stability over a 12-month period. This lens benefits from femtosecond laser capsulotomies. It can be positioned very predictably and offers an optimal platform for toric and multifocal IOL optics.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Migração do Implante de Lente Intraocular/fisiopatologia , Extração de Catarata , Implante de Lente Intraocular/métodos , Lentes Intraoculares , Acuidade Visual/fisiologia , Idoso , Idoso de 80 Anos ou mais , Opacificação da Cápsula/fisiopatologia , Topografia da Córnea , Feminino , Humanos , Terapia a Laser , Masculino , Pessoa de Meia-Idade , Oftalmoscopia , Estudos Prospectivos , Pseudofacia/fisiopatologia , Refração Ocular/fisiologia , Resultado do Tratamento
7.
Cornea ; 40(3): 393-397, 2021 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-33214414

RESUMO

PURPOSE: To describe a technique for traumatic cataract management for cases in which part of the anterior capsule has been incarcerated into a healed corneal laceration. METHODS: This is a single-center retrospective chart review of 3 patients with capsular/corneal incarceration after penetrating injury. Each patient underwent primary globe repair, followed by subsequent cataract surgery with intraocular lens (IOL) and iris prosthesis placement. The main outcome measure was corrected distance visual acuity. RESULTS: At a mean of 19-month postoperative follow-up (range 12-26 mo), corrected distance visual acuity ranged from 20/25 to 20/80 and all patients had improved vision compared with before cataract surgery. At the final follow-up, all IOLs and iris prostheses were in stable position and no eyes required corneal transplantation. CONCLUSIONS: Traumatic cataracts may be complicated by incarceration of the anterior capsule into the cornea. Incorporating the posterior aspect of the cornea into the anterior capsulotomy enables cataract removal and IOL placement in a stable capsular bag complex.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/métodos , Catarata/etiologia , Lesões da Córnea/cirurgia , Dissecação/métodos , Ferimentos Oculares Penetrantes/cirurgia , Adolescente , Adulto , Cápsula Anterior do Cristalino/patologia , Criança , Lesões da Córnea/patologia , Ferimentos Oculares Penetrantes/etiologia , Seguimentos , Humanos , Cristalino/lesões , Estudos Retrospectivos , Acuidade Visual/fisiologia
8.
Cir Cir ; 88(3): 321-324, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32538986

RESUMO

OBJECTIVE: To describe the transoperative results of cataract surgeries assisted by femtosecond laser. METHOD: Observational, descriptive, retrospective and cross-sectional study of 420 surgical records made with the LenSx platform from April 2015 to August 2017. The review of records was made through the internal electronic system accessing the preoperative and postoperative note. The information was collected through a database in Excel. The analysis of variables was performed by means of descriptive statistics with measures of central tendency. RESULTS: 86 files met inclusion criteria. The average age was 63 years. There was a general frequency of complications of 27.9% (24 surgeries). The most frequent complications were incomplete or impermeable corneal wound (37.5%), incomplete capsulorhexis (25%) and posterior capsule rupture (16.7%). CONCLUSIONS: The femtosecond laser technology incorporated in cataract surgery can be considered successful because of a low overall frequency of complications.


OBJETIVO: Describir las complicaciones transoperatorias de las cirugías de catarata asistidas por láser de femtosegundo. MÉTODO: Estudio observacional, descriptivo, retrospectivo y transversal de 420 expedientes de cirugías realizadas con la plataforma LenSx de abril de 2015 a agosto de 2017. La revisión de expedientes se realizó a través del sistema electrónico interno accediendo a las notas preoperatoria y posoperatoria. La información se recopiló en una base de datos Excel. Se realizó el análisis de variables por medio de estadística descriptiva con medidas de tendencia central. RESULTADOS: Cumplieron criterios de inclusión 86 expedientes. La edad promedio de los pacientes fue de 63 años. Se presentó una frecuencia general de complicaciones del 27.9% (24 cirugías). Las complicaciones que ocurrieron con mayor frecuencia fueron herida corneal incompleta o impermeable (37.5%), capsulorrexis incompleta (25%) y rotura de cápsula posterior (16.7%). CONCLUSIONES: La tecnología de láser de femtosegundo incorporada en la cirugía de catarata puede considerarse como exitosa al tener una baja frecuencia general de complicaciones.


Assuntos
Extração de Catarata/métodos , Terapia a Laser/métodos , Cirurgia Assistida por Computador/métodos , Idoso , Ruptura da Cápsula Anterior do Olho/epidemiologia , Ruptura da Cápsula Anterior do Olho/etiologia , Cápsula Anterior do Cristalino/cirurgia , Extração de Catarata/instrumentação , Córnea/cirurgia , Feminino , Humanos , Terapia a Laser/instrumentação , Curva de Aprendizado , Masculino , México , Pessoa de Meia-Idade , Ruptura da Cápsula Posterior do Olho/epidemiologia , Ruptura da Cápsula Posterior do Olho/etiologia , Complicações Pós-Operatórias/epidemiologia , Complicações Pós-Operatórias/etiologia , Estudos Retrospectivos , Cirurgia Assistida por Computador/instrumentação , Tomografia de Coerência Óptica/instrumentação , Tomografia de Coerência Óptica/métodos
9.
J Cataract Refract Surg ; 46(4): 497-502, 2020 04.
Artigo em Inglês | MEDLINE | ID: mdl-32271292

RESUMO

Anterior and posterior capsulotomies were performed in 12 eyes of 12 patients (age range 3 months to 6 years) with congenital cataracts and primary persistent hyperplastic primary vitreous (PHPV) syndrome using a femtosecond laser. The procedure was performed in 8 eyes with PHPV severity level 1 and 4 eyes with severity level 2 (Sudovsky classification). Surgeries were performed at the Kaluga branch of the S. Fyodorov Eye Microsurgery Federal State Institution, Russia. Postoperative follow-up was between 8 months and 36 months. The use of a low-energy femtosecond laser-assisted posterior capsulotomy in this pediatric population provided safe and predictable results with a reduced number of intraocular manipulations, and reduced the risk for complications.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Implante de Lente Intraocular , Vítreo Primário Hiperplásico Persistente/complicações , Facoemulsificação , Capsulotomia Posterior/métodos , Catarata/congênito , Criança , Pré-Escolar , Eletrorretinografia , Feminino , Humanos , Lactente , Pressão Intraocular/fisiologia , Masculino , Microscopia Acústica , Duração da Cirurgia , Oftalmoscopia , Vítreo Primário Hiperplásico Persistente/cirurgia , Pseudofacia/fisiopatologia , Acuidade Visual/fisiologia
10.
Br J Ophthalmol ; 104(3): 437-442, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-30948356

RESUMO

PURPOSE: To compare the anterior capsulotomy edge tear strength created by manual continuous curvilinear capsulorhexis (CCC), femtosecond laser-assisted capsulotomy (FLACS), and selective laser capsulotomy (SLC). SETTING: Singapore National Eye Centre, Singapore and Excel-Lens, Livermore, California, USA. DESIGN: Three armed study in paired human eyes. METHODS: Capsulotomies were performed in 60 cadaver eyes of 30 donors using CCC, Victus Femtosecond Laser, (Bausch & Lomb, Rochester, New York, USA) or CAPSULaser, (Excel-Lens, Los Gatos, California, USA). Three pairwise study groups each involved 10 pairs of eyes. Study group 1: SLC eyes compared with fellow eyes with CCC. Study group 2: CCC eyes compared with fellow eyes with FLACS. Study group 3: FLACS eyes compared with fellow eyes with SLC.A shoe-tree method was used to apply load to the capsulotomy edge, and Instron tensile stress instrument measured distension and threshold load applied to initiate capsule fracture. Relative fracture strengths and distension of CCC, FLACS and SLC were determined. Scanning electron microscopy (SEM) of capsule edges were reviewed RESULTS: Anterior capsulotomies behave as non-linear elastic (elastomeric) systems when exposed to an external load. The pairwise study demonstrated that the SLC fracture strength was superior to that of CCC by a factor of 1.46-fold with SLC 277±38 mN versus CCC with 190±37 mN. Furthermore, CCC fracture strength was superior to that of FLACS by a factor of 1.28-fold with CCC 186 + 37 mN versus FLACS 145 ± 35 mN (p < 0.001). This was determined by statistical analysis utilising the Wilcoxon matched-pairs signed-ranks test and in accordance with the Consolidated Standards of Reporting Trials guidelines. The capsule edge of SLC on SEM demonstrated a rolled over edge anteriorly and an alteration of collagen. CONCLUSIONS: The strength of the capsulotomy edge for SLC was significantly stronger than that of CCC which and both were significantly stronger than FLACS. The relative strengths can be explained by SEM of each type of capsulotomy.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/métodos , Terapia a Laser/métodos , Adulto , Idoso , Cápsula Anterior do Cristalino/ultraestrutura , Cadáver , Feminino , Humanos , Masculino , Microscopia Eletrônica de Varredura , Pessoa de Meia-Idade
12.
Medicina (Kaunas) ; 55(6)2019 May 31.
Artigo em Inglês | MEDLINE | ID: mdl-31159315

RESUMO

Background and objectives: The aim of this study was to examine via electron microscopy the lens epithelial cells in age-related cataracts and compare the findings between patients with and without exfoliation syndrome, in the Greek population. Materials and Methods: Twenty-one patients with age-related cataracts, older than 60 years, were included in the study. Eleven of them also suffered from exfoliation syndrome. Anterior lens capsules, obtained during phacoemulsification, were examined with a transmission electron microscope. Results: In all cases, ultrastructural features of diffuse intracellular and extracellular oedema were noticed to a varying degree and transparent vacuoles were detected. Often, there was more than one layer of cells, giving the impression that healthier cells tried to cover neighboring cells presenting extensive damage. Commonly, cells lost their regular shape and appeared with expanded nuclei carrying dense granules. Apoptotic cells were also detected. The epithelial cells frequently were completely destroyed or absent, exhibiting loose connections amongst them or with the basement membrane. In exfoliation syndrome (XFS) patients the alterations were more severe. Additionally, the lens epithelial cells (LECs) apical cell membrane appeared with varying distances from the basement membrane, due to different cell "heights", creating an irregular margin of the epithelium (p<0.05). Conclusion: Transmission electron microscope (TEM) examination revealed ultrastructural abnormalities in all patients' lens epithelia, more extended and more frequently observed in XFS group. In all cases, the lesions were comparable to those described in severe pathologies, all of which were excluded from the study. Environmental factors such as increased ultraviolet B (UVB) radiation exposure in Mediterranean countries, genetic factors, epigenetic factors, or all of them, could contribute to these alterations. Further epidemiological and molecular biology research is needed, so as to justify these results.


Assuntos
Cápsula Anterior do Cristalino/patologia , Catarata/patologia , Síndrome de Exfoliação/patologia , Idoso , Idoso de 80 Anos ou mais , Envelhecimento/patologia , Cápsula Anterior do Cristalino/cirurgia , Catarata/fisiopatologia , Células Epiteliais/microbiologia , Células Epiteliais/patologia , Síndrome de Exfoliação/complicações , Feminino , Humanos , Masculino , Microscopia Eletrônica/métodos , Pessoa de Meia-Idade
13.
J Cataract Refract Surg ; 45(5): 601-607, 2019 05.
Artigo em Inglês | MEDLINE | ID: mdl-30826240

RESUMO

PURPOSE: To compare the efficacy and safety of anterior capsulotomy creation with a new selective laser device (CAPSULaser) with those of manual capsulotomies. SETTING: GEMINI Eye Clinic, Zlin, Czech Republic. DESIGN: Prospective case series. METHODS: Patients were placed in cohorts based on age and cataract grade and randomly allocated to have laser capsulotomy or manual continuous curvilinear capsulorhexis (CCC). The anterior capsule was stained with microfiltered trypan blue 0.4%. The anterior capsulotomy was created with the laser device focused on the anterior capsule through a custom patient interface lens. Intraoperative video analysis with the use of an intraocular ruler and postoperative examinations were used to assess safety and efficacy (accuracy of capsulotomy size, circularity, centration). RESULTS: No intraoperative complications occurred in the laser group or the manual group. All capsulotomies in the laser group were free-floating with no tags or tears. The mean capsulotomy diameter was 5.03 mm overall (range 4.8 to 5.2 mm, laser group; 4.4 to 5.8 mm, manual group). In the laser group, all the capsulotomies were within 0.1 mm ± 0.1 (SD) of the target. The circularity accuracy was greater than 99.0% ± 1.0%; the mean centration of the capsulotomy in relation to the intraocular lens (IOL) was 0.1 ± 0.1 mm. All parameters were statistically significant (P < .01). The IOL-capsulotomy overlap was 360 degrees in all laser cases. CONCLUSIONS: Selective laser capsulotomy using a new proprietary trypan blue formulation was safe and effective in cataract surgery. The sizing, circularity, and centration of the laser capsulotomy were more accurate than those of the manual CCC, resulting in consistent 360-degree IOL coverage.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Catarata/complicações , Terapia a Laser/instrumentação , Implante de Lente Intraocular , Facoemulsificação , Adulto , Idoso , Capsulorrexe/métodos , Corantes/administração & dosagem , Feminino , Humanos , Terapia a Laser/efeitos adversos , Masculino , Pessoa de Meia-Idade , Facoemulsificação/métodos , Estudos Prospectivos , Pseudofacia/fisiopatologia , Resultado do Tratamento , Azul Tripano/administração & dosagem , Acuidade Visual/fisiologia
14.
PLoS One ; 14(1): e0210205, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-30620750

RESUMO

PURPOSE: To investigate the relationship between anterior capsule polish and visual function. METHODS: Data were obtained from Pubmed, Embase, Web of Science, WanFang, VIP and CNKI up to the end of May 2018, without any date or language restrictions for trials. The modified Jadad scale and the newcastle-ottawa scale were used to assess the quality of included studies. Uncorrected visual acuity (UCVA) and posterior capsule opacification (PCO) were used as outcome variables. Data on anterior capsule polish were pooled using weighted, random-effect meta-analysis. RESULTS: One randomized controlled trial and 4 observational cohort studies involving 2533 patients were included in the analyses. There was a statistically significant difference of UCVA (OR 1.92, 95% CI 1.41-2.61) between the polish group and the control group, indicating that anterior capsule polish improved UCVA. Further studies with continuous data also suggested that anterior capsule polish was associated with good UCVA (MD 0.11, 95% CI 0.06-0.16). Posterior capsule opacification rate for 1-year or longer follow-up were extracted for 2561 eyes in 3 studies. Posterior capsule opacification rate was lower in the anterior capsule polish group according to summary odds ratio on PCO rate (OR 0.42 95% CI 0.24-0.73). CONCLUSIONS: Anterior capsule polish prevents complication of modern cataract surgery and benefits on visual function in short term follow-up period.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Opacificação da Cápsula/epidemiologia , Facoemulsificação/métodos , Complicações Pós-Operatórias/epidemiologia , Acuidade Visual/fisiologia , Cápsula Anterior do Cristalino/fisiologia , Opacificação da Cápsula/etiologia , Opacificação da Cápsula/prevenção & controle , Humanos , Estudos Observacionais como Assunto , Facoemulsificação/efeitos adversos , Complicações Pós-Operatórias/etiologia , Complicações Pós-Operatórias/prevenção & controle , Ensaios Clínicos Controlados Aleatórios como Assunto , Resultado do Tratamento
15.
J Cataract Refract Surg ; 45(2): 213-218, 2019 02.
Artigo em Inglês | MEDLINE | ID: mdl-30458968

RESUMO

PURPOSE: To investigate whether new dyes and dye combinations can give equivalent or better staining in anterior capsule surgery than existing dyes with a low degree of toxicity on relevant cells. SETTING: University laboratory of Jacobs University Bremen, Germany. DESIGN: Laboratory experimental study. METHODS: Pig eyes were collected post mortem. Cataract was induced by microwave irradiation. Access to the lens capsule was through open-sky surgery. Staining was performed and results were documented by photography. The toxicity of the dyes was evaluated in 3 different cell lines immediately after exposure and with a delay of 24 hours, with exposure in the dark or subsequent strong illumination. RESULTS: A new cyanine dye, BIP (2-[5-[3,3-dimethyl-1-(4-sulfobutyl)-1,3-dihydro-indol-2-ylidene]-penta-1,3-dienyl]-3,3-dimethyl-1-(4-sulfobutyl)-3H-indolium sodium), was found to lead to green staining, with reduced toxicity on corneal endothelial cells. Staining could be further enhanced by combining it with trypan blue. Methylene blue was very toxic, whereas its combination with trypan blue was much less toxic. CONCLUSIONS: With BIP alone or in combination with trypan blue, safe staining of the capsule can be achieved, resulting in a green color.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Carbocianinas/farmacologia , Catarata/patologia , Azul Tripano/farmacologia , Animais , Cápsula Anterior do Cristalino/patologia , Capsulorrexe/métodos , Corantes/farmacologia , Modelos Animais de Doenças , Suínos
16.
J Cataract Refract Surg ; 45(3): 355-360, 2019 03.
Artigo em Inglês | MEDLINE | ID: mdl-30509745

RESUMO

PURPOSE: To study the effects of anterior capsulotomy diameter and discontinuity on tear threshold load and distension for the technique of continuous curvilinear capsulorhexis (CCC). SETTING: Singapore National Eye Centre, Singapore, and CapsuLaser Inc., Livermore, California, USA. DESIGN: Two separate randomized pairwise cadaver eye preclinical studies. METHODS: Capsulotomies were performed in 40 cadaver eyes of 20 donors using CCC. The pairwise comparisons were divided into 2 study groups: Study A: Continuous versus discontinuous capsulotomies; Study B: Capsulotomy diameter of 5.0 mm and smaller versus diameters of 5.2 mm and larger. A shoe-tree method was used to apply load to the capsulotomy rim, and the Instron tensile stress instrument measured threshold load and distension to initiate a capsular tear. Wilcoxon matched-pairs signed-rank tests were performed to assess statistical superiority. RESULTS: In Study Group A, all pairs demonstrated that continuous capsulotomies were better than discontinuous capsulotomies for both the anterior tear threshold load and distension (P < .01). In Study Group B, 80% of the pairs demonstrated that diameters of 5.2 mm and larger were better than those of 5.0 mm and smaller diameter (P < .05). CONCLUSIONS: Anterior capsulotomies behave as nonlinear elastic (elastomeric) systems when exposed to an external load and distension. This study demonstrated that continuous circular capsulotomies were more resistant to anterior tears than discontinuous capsulotomies. A point of irregularity or a defect in a capsulotomy rim has a high probability of being the tear initiation point. Furthermore, larger diameter capsulotomies were more resistant to anterior tears than smaller capsulotomies.


Assuntos
Cápsula Anterior do Cristalino/fisiopatologia , Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/métodos , Resistência à Tração/fisiologia , Adulto , Idoso , Cadáver , Elasticidade/fisiologia , Feminino , Humanos , Terapia a Laser/métodos , Masculino , Pessoa de Meia-Idade
17.
Curr Opin Ophthalmol ; 30(1): 19-24, 2019 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-30394991

RESUMO

PURPOSE OF REVIEW: Continuous curvilinear manual capsulorhexis is currently the standard of cataract surgery. In the past several years, new technologies have been developed to improve the consistency and safety of capsulorhexis creation. This article reviews the most recent technologies in capsulotomy formation and their advantages and disadvantages. RECENT FINDINGS: Guidance devices, femtosecond laser capsulotomy and precision pulse capsulotomy improve the centration, circularity and precision of anterior capsulorhexis and capsulotomy. These developments show particular promise for complex cataract surgeries, though clinical data on the refractive outcomes and complication rates of these technologies are currently limited and warrant additional investigation. SUMMARY: New technological advances in capsulorhexis help surgeons achieve a more ideal capsulotomy geometry. Whether this translates into more predictable refractive outcomes and safer surgeries remains an area of future study.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/métodos , Terapia a Laser , Extração de Catarata , Humanos , Acuidade Visual
18.
J Cataract Refract Surg ; 44(11): 1333-1335, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30201129

RESUMO

PURPOSE: To investigate the intraoperative performance and the ultrastructural features of anterior capsulotomy performed with the improved Zepto precision pulse capsulotomy (PPC) device. SETTING: Launceston Eye Institute, Launceston, Tasmania, Australia. DESIGN: Prospective, consecutive case series. METHODS: Intraoperative observation of performance and complications were made on consecutive eyes having capsulotomies with the improved PPC device. The capsulotomy specimens were examined under scanning electron microscope and compared with manual continuous curvilinear capsulorhexis and femtosecond laser-assisted cataract surgery specimens. RESULTS: The study comprised 52 eyes. Intended capsulotomy occurred in 50 eyes with 2 device failures. Complete free-floating capsulotomies were achieved in 48 eyes (96%). Anterior capsule tears occurred in 2 eyes (4%). CONCLUSIONS: The ability of the PPC device to create complete free-floating capsulotomies improved; however, the radial tear rate remained high. The ultrastructural features in ex vivo human capsulotomy specimens still showed areas of irregular capsule margin with frayed edges.


Assuntos
Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/instrumentação , Cápsula Anterior do Cristalino/ultraestrutura , Capsulorrexe/normas , Humanos , Estudos Prospectivos
19.
Graefes Arch Clin Exp Ophthalmol ; 256(9): 1631-1637, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29982898

RESUMO

PURPOSE: In the present study, we aimed to examine the anterior lens capsule using transmission electron microscopy (TEM) and compare the findings in patients with and without exfoliation syndrome (XFS). METHODS: Eighteen patients with senile cataract, including 10 with XFS, were included. Anterior capsule specimens were obtained from patients during phacoemulsification through continuous curvilinear capsulorrhexis, and were examined via TEM. RESULTS: In the XFS group, in addition to the typical fibrillar material above the basement membrane of the lens capsule, another unknown, microgranular, electron-dense, unbound material was observed beneath the lens epithelium. Larger formations appeared to detach from the surface of the epithelial cells, and oval or crescent-shaped structures of an electron-denser material were less commonly observed on the apical side of the epithelium. Membranous structures were occasionally attached to epithelial cells that often exhibited thicker or ruptured cell membranes on their apical-free side, along with deposits of electron-dense material. Degenerative lesions of various severities were observed at the epithelium in both groups. CONCLUSION: The anterior lens capsule epithelium in patients with XFS exhibits a highly irregular and rough margin on its free side, with unbound material over its membrane, which probably contributes to loose contact with the underlying lens and leads to different clinical behaviors in XFS eyes during cataract surgery.


Assuntos
Cápsula Anterior do Cristalino/ultraestrutura , Síndrome de Exfoliação/patologia , Microscopia Eletrônica de Transmissão/métodos , Idoso , Cápsula Anterior do Cristalino/cirurgia , Capsulorrexe/métodos , Catarata/diagnóstico , Epitélio/ultraestrutura , Feminino , Humanos , Masculino , Facoemulsificação/métodos
20.
J Int Med Res ; 46(9): 3692-3697, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29916304

RESUMO

Objective To investigate the long-term safety and efficacy of Nd:YAG laser anterior capsulotomy for the treatment of anterior capsular phimosis. Methods We retrospectively analyzed a consecutive case series of Nd:YAG laser anterior capsulotomy in patients with anterior capsular phimosis, who were treated between November 2012 and April 2014. Data collected included risk factors, interval between surgery and capsulotomy, best-corrected visual acuity (BCVA), and diameter of anterior capsule opening before and after Nd:YAG laser anterior capsulotomy. Results Eleven eyes of 11 patients were included in the study. The mean follow-up time was 30.1 ± 4.5 months (range: 26-42 months). At the last follow-up, the mean diameter of the anterior capsule opening was 5.1 ± 0.2 mm, which was significantly greater than the diameter before laser capsulotomy (2.2 ± 0.8 mm). BCVA remained stable or improved in nine eyes (81.8%) following capsulotomy. No patients experienced recurrence of phimosis. Conclusions In a long-term study of >2 years, we found that Nd:YAG laser anterior capsulotomy is safe and effective for the treatment of anterior capsule phimosis.


Assuntos
Cápsula Anterior do Cristalino/patologia , Capsulorrexe/efeitos adversos , Terapia a Laser/métodos , Lasers de Estado Sólido/uso terapêutico , Cápsula do Cristalino/cirurgia , Doenças do Cristalino/cirurgia , Idoso , Idoso de 80 Anos ou mais , Cápsula Anterior do Cristalino/cirurgia , Extração de Catarata/efeitos adversos , Feminino , Fibrose , Seguimentos , Humanos , Cápsula do Cristalino/patologia , Doenças do Cristalino/etiologia , Implante de Lente Intraocular/efeitos adversos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos
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