Base de dados : MEDLINE
Pesquisa : E04.540.825 [Categoria DeCS]
Referências encontradas : 1921 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 193 ir para página                         

  1 / 1921 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29246204
[Au] Autor:Liu L; Wang F; Xu D; Xie C; Zou J
[Ad] Endereço:Department of Ophthalmology, Shanghai Tenth People's Hospital, Tong Ji University, Shanghai, 200072, China.
[Ti] Título:The application of wide-field laser ophthalmoscopy in fundus examination before myopic refractive surgery.
[So] Source:BMC Ophthalmol;17(1):250, 2017 Dec 15.
[Is] ISSN:1471-2415
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: To evaluate wide-field laser ophthalmoscopy (Optomap 200Tx) for screening retinal lesions before myopic refractive surgery. METHODS: Seventy-eight eyes of 78 consecutive refractive surgery candidates were included in this study. All subjects underwent Optomap 200Tx, mydriatic slit-lamp lens examination and the Goldmann three-mirror contact lens examination, which was considered as the reference method for determining retinal lesions. RESULTS: Forty of 78 eyes had retinal lesions (51.28%) and three eyes had retinal breaks (3.85%), which were diagnosed by the Goldmann three-mirror contact lens examination. Compared to the Goldmann three-mirror contact lens examination, the detection rate with the Optomap 200Tx was 91.73%% for retinal lesions, while the detection rate of mydriatic slit-lamp lens exams was 81.20%. There were no statistically significant differences among the three methods used for the diagnoses of myopic conus, tessellation and retinal breaks(all p > 0.05). For peripheral retinal lesions, the detection rate of the Optomap 200Tx examinations were similar to the Goldmann three-mirror contact lens exams (all p > 0.05), but were higher than the results of slit-lamp lens examinations (all p < 0.05). Regarding the vitreoretinal adhesions, the Goldmann three-mirror contact lens examinations had higher detection rates than did the Optomap 200Tx examinations (p = 0.031). CONCLUSIONS: The Optomap 200Tx examinations is a convenient and feasible method to determine fundus pathological changes in myopic patients, especially for patients who can not endure pupil dilation. In order to avoid misdiagnosis of peripheral retinal lesions, Goldmann three-mirror contact lens examination is needed.
[Mh] Termos MeSH primário: Fundo de Olho
Miopia/complicações
Oftalmoscopia/métodos
Doenças Retinianas/diagnóstico por imagem
[Mh] Termos MeSH secundário: Adulto
Feminino
Seres Humanos
Masculino
Miopia/cirurgia
Período Pré-Operatório
Procedimentos Cirúrgicos Refrativos
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180105
[Lr] Data última revisão:
180105
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171217
[St] Status:MEDLINE
[do] DOI:10.1186/s12886-017-0647-4


  2 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28594648
[Au] Autor:Giri P; Azar DT
[Ad] Endereço:Department of Ophthalmology and Visual Sciences, Illinois Eye and Ear Infirmary, College of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA.
[Ti] Título:Risk profiles of ectasia after keratorefractive surgery.
[So] Source:Curr Opin Ophthalmol;28(4):337-342, 2017 Jul.
[Is] ISSN:1531-7021
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE OF REVIEW: To identify and evaluate the risk factors of iatrogenic ectasia after refractive surgery. RECENT FINDINGS: We reviewed recently published papers that identified various risk factors associated with ectasia after LASIK, photorefractive keratectomy, small incision lenticule extraction, and other refractive surgical procedures. We also attempted to evaluate the relative contributions of these factors to the development of ectasia following refractive surgery. Forme fruste keratoconus, genetic predisposition to keratoconus, low residual stromal bed thickness (through high myopia, thin preoperative cornea, or thick LASIK flap), and irregular corneal topography have been identified as risk factors for keratectasia development after refractive surgical procedures. A newly proposed metric, percentage tissue altered, has been reported to be a robust indicator for post LASIK ectasia risk calculation. Several cases of keratectasia have also been reported 6 to 12 months following minimally invasive small incision lenticule extraction procedure. Other risk factors associated with iatrogenic ectasia include eye rubbing, young age, and pregnancy. SUMMARY: Ectasia after refractive surgery is a relatively rare complication which can lead to sight-threatening complications if not detected and treated in time. It is important to continue our quest to improve our methods of identifying absolute and relative risk factors of ectasia and their cut-off values following various keratorefractive surgical procedures.
[Mh] Termos MeSH primário: Doenças da Córnea/etiologia
Complicações Pós-Operatórias/etiologia
Procedimentos Cirúrgicos Refrativos/efeitos adversos
[Mh] Termos MeSH secundário: Adolescente
Adulto
Fatores Etários
Doenças da Córnea/patologia
Topografia da Córnea
Dilatação Patológica/etiologia
Feminino
Seres Humanos
Doença Iatrogênica
Masculino
Procedimentos Cirúrgicos Refrativos/métodos
Fatores de Risco
Retalhos Cirúrgicos
Adulto Jovem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170609
[St] Status:MEDLINE
[do] DOI:10.1097/ICU.0000000000000383


  3 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28494492
[Au] Autor:Spiru B; Kling S; Hafezi F; Sekundo W
[Ad] Endereço:Department of Ophthalmology, Philipps University of Marburg, Marburg, Germany.
[Ti] Título:Biomechanical Differences Between Femtosecond Lenticule Extraction (FLEx) and Small Incision Lenticule Extraction (SmILE) Tested by 2D-Extensometry in Ex Vivo Porcine Eyes.
[So] Source:Invest Ophthalmol Vis Sci;58(5):2591-2595, 2017 May 01.
[Is] ISSN:1552-5783
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Purpose: To evaluate the biomechanical stability of ex vivo porcine corneas after femtosecond lenticule extraction (FLEx) and small incision lenticule extraction (SmILE) refractive surgeries. Methods: Forty-five porcine eyes were equally divided into three groups: Groups 1 and 2 were treated with FLEx and SmILE procedure, respectively. Group 3 served as control. A refractive correction of -14 diopters (D) with a 7-mm zone using either a 160-µm flap (FLEx) or a 160-µm cap (SmILE) was performed. For two-dimensional (2D) elastic and viscoelastic biomechanical characterization, two testing cycles (preconditioning stress-strain curve from 1.27 to 12.5 N, stress-relaxation at 12.5 N during 120 seconds) were conducted. Young's modulus and Prony constants were calculated. Results: At 0.8% of strain, FLEx (370 ± 36 kPa) could resist a significantly lower stress than SmILE (392 ± 19 kPa, P = 0.046) and the control group (402 ± 30 kPa, P = 0.013). Also, FLEx (46.1 ± 4.5 MPa) had a significantly lower Young's modulus than the control group (50.2 ± 3.4 MPa, P = 0.008). The Young's modulus of SmILE (48.6 ± 2.5 MPa) had values situated between untreated corneas and FLEx-treated corneas. When compared to untreated controls, the stress resistance decreased by 8.0% with FLEx and 2.5% with SmILE; Young's modulus decreased by 5.1% with FLEx and 1.04% with SmILE. With a cap-based procedure, both anterior cap and stromal bed carry the intraocular pressure, while in a flap-based procedure, only the stromal bed does. Conclusions: Compared to flap-based procedures like FLEx, the cap-based technique SmILE can be considered superior in terms of biomechanical stability, when measured experimentally in ex vivo porcine corneas.
[Mh] Termos MeSH primário: Córnea/fisiopatologia
Cirurgia da Córnea a Laser/métodos
Lasers de Excimer/uso terapêutico
Miopia/cirurgia
Procedimentos Cirúrgicos Refrativos/métodos
Acuidade Visual
[Mh] Termos MeSH secundário: Animais
Fenômenos Biomecânicos
Córnea/cirurgia
Modelos Animais de Doenças
Miopia/fisiopatologia
Estudos Prospectivos
Retalhos Cirúrgicos
Suínos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170719
[Lr] Data última revisão:
170719
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170512
[St] Status:MEDLINE
[do] DOI:10.1167/iovs.16-20211


  4 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28445204
[Au] Autor:Stahl ED
[Ad] Endereço:aUniversity of Missouri - Kansas City, Kansas City, MO bUniversity of Kansas, Prairie Village, KS cPediatric Ophthalmology, Children's Mercy Hospital, Kansas City, MO, USA.
[Ti] Título:Pediatric refractive surgery.
[So] Source:Curr Opin Ophthalmol;28(4):305-309, 2017 Jul.
[Is] ISSN:1531-7021
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE OF REVIEW: Refractive surgery procedures have been performed on children since the early 1980s. This article will review this history as well as current thoughts on treating children with large refractive errors. RECENT FINDINGS: Pediatric refractive surgery has developed slowly as very few children fit the criteria for treatment. For this reason, practice patterns are varied and publications are rare. Publications in recent years have focused on intraocular procedures over laser refractive surgery. SUMMARY: Pediatric refractive surgery is an evolving field as surgeons try to find the best long-term treatments for these young patients.
[Mh] Termos MeSH primário: Erros de Refração/terapia
Procedimentos Cirúrgicos Refrativos/métodos
[Mh] Termos MeSH secundário: Criança
História do Século XX
História do Século XXI
Seres Humanos
Padrões de Prática Médica
Procedimentos Cirúrgicos Refrativos/história
[Pt] Tipo de publicação:HISTORICAL ARTICLE; JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170427
[St] Status:MEDLINE
[do] DOI:10.1097/ICU.0000000000000384


  5 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28445203
[Au] Autor:Ahmad M; Chocron I; Shrivastava A
[Ad] Endereço:Department of Ophthalmology, Glaucoma Service Montefiore Medical Center, Albert Einstein College of Medicine, Bronx, New York, USA.
[Ti] Título:Considerations for refractive surgery in the glaucoma patient.
[So] Source:Curr Opin Ophthalmol;28(4):310-315, 2017 Jul.
[Is] ISSN:1531-7021
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE OF REVIEW: Given the popularity of keratorefractive surgery, and an aging populous of patients who have undergone these procedures, there is an increasing need for updated management protocols. This is particularly relevant for patients with chronic progressive diseases such as glaucoma, due to the variety of related diagnostic and management challenges inherent to these diseases. Here, we will review the current literature to provide an update on the management of patients with glaucoma who are undergoing, or have had laser ablative refractive surgery. Preoperative testing and eligibility considerations, intraoperative factors, and postoperative observation and follow-up will be discussed. RECENT FINDINGS: Intraoperative intraocular pressure (IOP) rise during flap creation is associated with low risk of acute complications, and furthermore do not appear to have significant long term effects. Modern technologies have improved our ability to determine accurate IOP after refractive surgery despite postoperative changes in corneal architecture. Furthermore, advances in structural imaging allow for earlier detection of even subtle glaucomatous nerve damage. SUMMARY: Although glaucoma remains a relative contraindication to refractive surgery, it is a safe procedure for many patients with appropriate perioperative management and follow-up. Advancements in diagnostic modalities have allowed for earlier detection of glaucomatous disease, and subsequent earlier intervention when appropriate. Standardized diagnostic algorithms and rigorous perioperative assessment are critical to safe management of glaucoma patients undergoing refractive corneal surgery.
[Mh] Termos MeSH primário: Glaucoma/complicações
Procedimentos Cirúrgicos Refrativos
[Mh] Termos MeSH secundário: Glaucoma/diagnóstico
Seres Humanos
Pressão Intraocular
Complicações Pós-Operatórias/prevenção & controle
Cuidados Pré-Operatórios
Fatores de Risco
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170427
[St] Status:MEDLINE
[do] DOI:10.1097/ICU.0000000000000381


  6 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28407160
[Au] Autor:Reinstein DZ; Archer TJ; Srinivasan S; Mamalis N; Kohnen T; Dupps WJ; Randleman JB
[Ti] Título:Standard for Reporting Refractive Outcomes of Intraocular Lens-Based Refractive Surgery.
[So] Source:J Refract Surg;33(4):218-222, 2017 04 01.
[Is] ISSN:1081-597X
[Cp] País de publicação:United States
[La] Idioma:eng
[Mh] Termos MeSH primário: Lentes Intraoculares
Procedimentos Cirúrgicos Refrativos
[Mh] Termos MeSH secundário: Seres Humanos
Implante de Lente Intraocular
Refração Ocular
[Pt] Tipo de publicação:EDITORIAL; COMMENT
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170907
[Lr] Data última revisão:
170907
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170414
[St] Status:MEDLINE
[do] DOI:10.3928/1081597X-20170302-01


  7 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28399068
[Au] Autor:Tong CM; Baydoun L; Melles GRJ
[Ad] Endereço:aNetherlands Institute for Innovative Ocular Surgery, Rotterdam, The Netherlands bUniversity of Alberta, Edmonton, Alberta, Canada cMelles Cornea Clinic Rotterdam, Rotterdam, The Netherlands.
[Ti] Título:Descemet membrane endothelial keratoplasty and refractive surgery.
[So] Source:Curr Opin Ophthalmol;28(4):316-325, 2017 Jul.
[Is] ISSN:1531-7021
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PURPOSE OF REVIEW: Descemet membrane endothelial keratoplasty (DMEK) has become a first-line treatment in corneal endothelial diseases because of its exceptional clinical outcomes and low complication rates. Because of its improved refractive predictability, DMEK is now also considered for managing cases with endothelial decompensation following previous refractive procedures, or in combination with those. This article reviews the clinical outcomes in these cases and discusses the possibility of refractive interventions following DMEK. RECENT FINDINGS: DMEK has been successfully performed in eyes after laser in-situ keratomileusis, eyes after anterior chamber intraocular lens (IOL) implantation and aphakic eyes. Often, DMEK is combined with cataract surgery (triple-DMEK). Initial reports on reducing the refractive cylinder by toric IOL implantation are available. Although there are some reports on phacoemulsification and IOL implantation after phakic DMEK, reports on laser refractive procedures following DMEK are lacking. SUMMARY: In contrast to earlier keratoplasty techniques, DMEK induces on average only mild refractive shifts owing to the 'natural' restoration of the cornea. As such, DMEK may be ideal in managing corneal decompensation in refractive patients. However, further studies are required to assess the safety and efficacy of DMEK after refractive treatment and of refractive procedures following DMEK.
[Mh] Termos MeSH primário: Doenças da Córnea/cirurgia
Ceratoplastia Endotelial com Remoção da Lâmina Limitante Posterior/métodos
Procedimentos Cirúrgicos Refrativos
[Mh] Termos MeSH secundário: Lâmina Limitante Posterior/cirurgia
Seres Humanos
Implante de Lente Intraocular/métodos
Facoemulsificação/métodos
Complicações Pós-Operatórias/cirurgia
Acuidade Visual
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170620
[Lr] Data última revisão:
170620
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170412
[St] Status:MEDLINE
[do] DOI:10.1097/ICU.0000000000000380


  8 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28291201
[Au] Autor:Kostin OA; Rebrikov SV; Ovchinnikov AI; Stepanov AA; Takhchidi KP
[Ad] Endereço:Ekaterinburg branch of the Academician S.N. Fyodorov IRTC 'Eye Microsurgery', 4A Akademika Bardina, Ekaterinburg, Sverdlovskaya Oblast, 620149.
[Ti] Título:[Results of residual ametropia correction using CIRCLE technology after femtosecond laser SMILE surgery].
[Ti] Título:Rezul'taty ustraneniya ostatochnoi ametropii metodom CIRCLE posle lazernykh operatsii po tekhnologii SMILE..
[So] Source:Vestn Oftalmol;133(1):55-59, 2017.
[Is] ISSN:0042-465X
[Cp] País de publicação:Russia (Federation)
[La] Idioma:rus
[Ab] Resumo:AIM: to evaluate functional results of reoperation performed according to the CIRCLE technology and using the VisuMax femtosecond laser and MEL-80 excimer laser in cases of regression of the refractive effect after SMILE surgery. MATERIAL AND METHODS: We studied a group of post-SMILE patients. In those, who showed regression of the refractive effect at 1 year, reoperation was performed according to the CIRCLE technology and using the VisuMax femtosecond laser. The corneal flap was separated from the stromal bed and turned aside. Excimer laser ablation of the stromal bed was performed with the MEL 80 machine. The corneal flap was then placed back and rinsed from both sides. Uncorrected (UCVA) and corrected (BCVA) visual acuity as well as spherical equivalent (SE) were estimated before reoperation, on day 1, and at 1 month. RESULTS: After reoperation, BCVA and UCVA improved. Patient refraction became close to emmetropia. Specifically, UCVA was 0.23±0.18 at baseline (i.e. 1 year after SMILE) and 0.93±0.11 after the CIRCLE procedure (p<0.05). The absolute value of SE was 1.86±1.15 D and 0±0 D before and after CIRCLE, respectively (p<0.05). BCVA change was not statistically significant - from 0.95±0.1 to 0.93±0.11 (p>0.05). CONCLUSION: Reoperation performed according to the CIRCLE technology and using the VisuMax femtosecond laser and MEL-80 excimer laser provides an increase in visual acuity in case of post-SMILE regression of the refractive effect.
[Mh] Termos MeSH primário: Transplante de Córnea
Terapia a Laser
Lasers de Excimer/uso terapêutico
Complicações Pós-Operatórias
Erros de Refração
Procedimentos Cirúrgicos Refrativos
[Mh] Termos MeSH secundário: Adulto
Córnea/patologia
Transplante de Córnea/instrumentação
Transplante de Córnea/métodos
Feminino
Seres Humanos
Terapia a Laser/instrumentação
Terapia a Laser/métodos
Masculino
Complicações Pós-Operatórias/diagnóstico
Complicações Pós-Operatórias/etiologia
Complicações Pós-Operatórias/cirurgia
Erros de Refração/diagnóstico
Erros de Refração/fisiopatologia
Procedimentos Cirúrgicos Refrativos/efeitos adversos
Procedimentos Cirúrgicos Refrativos/instrumentação
Procedimentos Cirúrgicos Refrativos/métodos
Reoperação/métodos
Reoperação/estatística & dados numéricos
Retalhos Cirúrgicos
Resultado do Tratamento
Acuidade Visual
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1707
[Cu] Atualização por classe:170706
[Lr] Data última revisão:
170706
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170315
[St] Status:MEDLINE
[do] DOI:10.17116/oftalma2017133155-59


  9 / 1921 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28196497
[Au] Autor:Nuzzi R; Tridico F
[Ad] Endereço:Institute of Ophthalmology, Department of Surgical Sciences, University of Turin, Via Juvarra 19, 10100, Turin, Italy. prof.nuzzi_raffaele@hotmail.it.
[Ti] Título:Comparison of visual outcomes, spectacles dependence and patient satisfaction of multifocal and accommodative intraocular lenses: innovative perspectives for maximal refractive-oriented cataract surgery.
[So] Source:BMC Ophthalmol;17(1):12, 2017 Feb 14.
[Is] ISSN:1471-2415
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The aim of this study was to evaluate visual outcomes for different working distances (far, 60 cm and 33 cm) and impact on vision quality of multifocal IOLs AcrySof ResTOR SN6AD1 and SN6AD3 (Alcon, Inc., Fort Worth, Texas, USA) as well as REVIEW FIL611PV multifocal and OPTOFLEX FIL618 accommodative IOLs (Soleko, Ltd., Rome, Italy) in patients undergoing bilateral phacoemulsification. METHODS: In this observational prospective study 63 patients undergoing binocular cataract surgery were divided into four groups for implantation of one of the IOLs under evaluation. Visual outcomes were evaluated at 1 day, 7 days, 1 month, 3 months and 6 months after surgery. Patients' satisfaction and spectacle independence were evaluated with questionnaires administered at the 6-months follow-up. RESULTS: Improvements in visual acuity for the three working distances were statistically significant in all cases compared to the preoperative status, especially after binocular implantation. The AcrySof ReSTOR SN6AD1 multifocal IOL provided the best visual acuity results and tolerability for all working distances. While performing worse than SN6AD1, FIL611PV and FIL618 provided better uncorrected visual acuity and spectacles independence for intermediate/close-up and far distances respectively, in comparison with the SN6AD3 group. CONCLUSIONS: SN6AD1 was confirmed the best choice for all working distances. However, FIL611PV IOL may represent a valid and more cost-effective alternative, especially if surgeons intend to prioritize spectacle independence and patient autonomy at intermediate and close-up distances, in accordance to specific needs and requests. TRIAL REGISTRATION: Trial retrospectively registered in ISRCTN Registry on 02/02/2017. TRN: ISRCTN14145737 .
[Mh] Termos MeSH primário: Acomodação Ocular
Extração de Catarata/métodos
Lentes Intraoculares
Satisfação do Paciente
Pseudofacia/fisiopatologia
Qualidade de Vida
Procedimentos Cirúrgicos Refrativos/métodos
[Mh] Termos MeSH secundário: Idoso
Feminino
Seguimentos
Seres Humanos
Masculino
Meia-Idade
Estudos Prospectivos
Desenho de Prótese
Inquéritos e Questionários
Visão Binocular
Acuidade Visual
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; OBSERVATIONAL STUDY
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170314
[Lr] Data última revisão:
170314
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170216
[St] Status:MEDLINE
[do] DOI:10.1186/s12886-017-0411-9


  10 / 1921 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28135747
[Au] Autor:Blum J; Blum M; Rill MS; Haueisen J
[Ad] Endereço:Institut für Biomedizinische Technik und Informatik, Technische Universität Ilmenau.
[Ti] Título:[Flexible Guidance of Ultra-Short Laser Pulses in Ophthalmic Therapy Systems].
[Ti] Título:Flexible Führung ultrakurzer Laserpulse in ophthalmologischen Therapiesystemen..
[So] Source:Klin Monbl Augenheilkd;234(1):109-116, 2017 Jan.
[Is] ISSN:1439-3999
[Cp] País de publicação:Germany
[La] Idioma:ger
[Ab] Resumo:In the last 20 years, the role of ultrashort pulsed lasers in ophthalmology has become increasingly important. However, it is still impossible to guide ultra-short laser pulses with standard glass fibres. The highly energetic femtosecond pulses would destroy the fibre material, and non-linear dispersion effects would significantly change beam parameters. In contrast, photonic crystal fibres mainly guide the laser pulses in air, so that absorption and dispersive pulse broadening have essentially no effect. This article compares classical beam guidance with mirrors, lenses and prisms with photonic crystal fibres and describes the underlying concepts and the current state of technology. A classical mirror arm possesses more variable optical properties, while the HCF (Hollow-Core Photonic Crystal Fibre) must be matched in terms of the laser energy and the laser spectrum. In contrast, the HCF has more advantages in respect of handling, system integration and costs. For applications based on photodisruptive laser-tissue interaction, the relatively low damage threshold of photonic crystal fibres compared to classic beam guiding systems is unacceptable. If, however, pulsed laser radiation has a sufficiently low peak intensity, e.g. as used for plasma-induced ablation, photonic crystal fibres can definitely be considered as an alternative solution to classic beam guidance.
[Mh] Termos MeSH primário: Tecnologia de Fibra Óptica/instrumentação
Terapia a Laser/instrumentação
Lasers
Lentes
Procedimentos Cirúrgicos Oftalmológicos/instrumentação
Refratometria/instrumentação
[Mh] Termos MeSH secundário: Desenho de Equipamento
Análise de Falha de Equipamento
Luz
Procedimentos Cirúrgicos Refrativos/instrumentação
Espalhamento de Radiação
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170131
[St] Status:MEDLINE
[do] DOI:10.1055/s-0042-121422



página 1 de 193 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde