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Biomedical subjects

P Brauweiler

Publications and source records attributed to P Brauweiler.

10 recordsLinked to original sources
PubMed2003

[Complications of foldable intraocular lenses requiring explantation. Results of the 2000 and 2001 survey in Germany].

PURPOSE: A survey was sent to all members of the German Society of Ophthalmic Surgeons to evaluate complications that required explantation of foldable intraocular lenses (IOLs). METHODS: Data on preoperative visual acuity, foldable IOL design and material, and the reason for explantation were obtained and analysed. We received 185 surveys for 2000 and 2001. RESULTS: In 2000 and 2001, the most common reasons for IOL explantation were: incorrect lens power (31%) and dislocation (19%) in three-piece acrylic IOLs, incorrect power (31%) and decentration (17%) in monofocal silicone IOLs, and opacification (46%) in hydrophilic IOLs. The most common reasons for the exchange of monofocal IOLs were lens opacification in 2000 and incorrect IOL power in 2001. CONCLUSION: Besides the most frequent complications of decentration and incorrect power observed in rigid IOLs,new complications associated with foldable IOLs occurred (e.g., optic opacification and calcification). Accurate calculation of IOL power and further improvements in material and design are still necessary to minimize the rate of explantations.

Acrylates↗
PubMed2002

[Complications with foldable intraocular lenses with subsequent explantation in 1998 and 1999. Results of a questionnaire evaluation].

PURPOSE: A questionnaire was sent to all members of the German Society of Ophthalmic Surgeons to evaluate complications of foldable intraocular lenses (IOLs) that required explanation. METHODS: Information on preoperative visual acuity, foldable IOL design and material as well as the reason for IOL explantation was obtained and analysed. We received 167 completed questionnaires for 1998 and 1999. RESULTS: In 1998 and 1999 the most common reasons for IOL explantation were as follows: incorrect lens power for 56% of the 3-piece hydrophobic acrylic IOLs, 16% because of glare or other photic phenomena, 40% of the 1-piece hydrophilic acrylic IOLs were explanted because of incorrect lens power and 30% for IOL damage. For the 3-piece monofocal silicone IOLs, 41% were explanted because of incorrect IOL power and 32% because of IOL decentration. For the 1-piece Hydrogel IOL, 76% were explanted because of opacification of the optic and 14% because of incorrect lens power. Most multifocal IOLs were explanted because of photic phenomena. CONCLUSION: In addition to the most common complications such as decentration and incorrect IOL power observed in rigid IOLs, new complications associated with foldable IOLs occurred such as optic opacification, glare and photic phenomena. Some complications seemed to appear in particular IOL types (opacification: SC-60BOUV, MDR), while others were observed in all types of foldable lenses. Accurate calculation of the IOL power and further improvement of the IOL material and design seem to be necessary to minimise the rate of explantations.

Device Removal↗
PubMed1999

Dodick photolysis for cataract surgery: early experience with the Q-switched neodymium: YAG laser in 100 consecutive patients.

OBJECTIVE: To evaluate the safety and efficacy of a Q-switched neodymium:YAG (Nd:YAG) laser for removal of the human cataract. DESIGN: A multicenter, prospective, noncomparative study. PARTICIPANTS: A total of 100 consecutive eyes undergoing cataract extraction with the Dodick Photolysis, Q-switched Nd:YAG laser. MAIN OUTCOME MEASURE: Corneal endothelial cell loss, visual acuity improvement, intraocular pressure change, total intraocular energy used, and intraoperative and postoperative complications. RESULTS: The mean values were postoperative visual acuity improvement from 20/46.5 (0.43) to 20/26.6 (0.75), decrease in endothelial cell count of 177 cells/mm2 (7.55%), and intraocular energy used of 6.7 J. Minor complications were encountered in three cases. CONCLUSIONS: These data suggest that Dodick Photolysis may be a safe and effective new technology for cataract removal in human eyes. It appears to offer low intraocular energy and heat release, a clear-cornea incision less than 1.5 mm in size, and safe operation within the capsular bag.

Adolescent↗
PubMed1996

First results of cataract surgery and implantation of negative power intraocular lenses in highly myopic eyes.

OBJECTIVES: To determine whether cataract surgery in highly myopic eyes should be considered high-risk surgery and whether exact intraocular lenses (IOLs) should be implanted if negative power is required. SITE: Klinik Dardenne, Bonn-Bad Godesberg, Germany. METHOD: We retrospectively studied 32 eyes of 27 highly myopic patients who had cataract surgery and posterior chamber IOL implantation. Intraocular lens power varied from -1.0 to -8.0 diopters (D), and eye length varied from 31.0 mm to more than 35.0 mm. Follow-up ranged from 6 to 36 months. Patients were analyzed for postoperative visual acuity and for intraoperative and postoperative complications. RESULTS: No patients experienced intraoperative complications. Posterior capsule opacification, which occurred in 14 eyes, was the only postoperative complication in the anterior or posterior segments. Ninety-four percent of eyes achieved improved best corrected visual acuity, and 69% of eyes were within 1.0 D of the refractive target. CONCLUSIONS: Cataract surgery can be performed in highly myopic eyes without intraoperative complications. A posterior chamber IOL should be implanted for postoperative refraction and intraocular stability, even if negative lens power is required.

Adult↗
PubMed1996

Visual function in pseudophakic eyes with poly(methyl methacrylate), silicone, and acrylic intraocular lenses.

PURPOSE: To evaluate the quality of visual function after cataract surgery and intraocular lens (IOL) implantation with three lens materials. SETTING: Klinik Dardenne, Bonn Bad Godesberg, Germany. METHODS: In a prospective, randomized study, 55 patients having uncomplicated phacoemulsification received IOLs made of three materials: 16 received acrylic IOLs, 20 received silicone IOLs, and 19 received poly(methyl methacrylate) (PMMA) IOLs. Pseudophakic patients with accompanying eye diseases were excluded. Visual acuity, glare sensitivity, contrast sensitivity, and mesopic acuity were evaluated 6 weeks postoperatively. RESULTS: Postoperatively, best corrected visual acuity was excellent in all three lens groups. Acuity under bright light conditions and contrast sensitivity were low in all groups; mesopic acuity was extremely low in 73% of patients. Glare and contrast sensitivity were significantly better with PMMA and acrylic IOLs. CONCLUSION: The visual quality achieved in pseudophakic eyes with three different lens materials was lower than expected. The results of individual visual function tests were better for PMMA and acrylic IOLs than for silicone IOLs.

Acrylates↗
PubMed1996

Bimanual irrigation/aspiration.

A bimanual irrigation/aspiration (I/A) device was developed to allow safer, easier removal of the lens cortex after phacoemulsification. The device can be used in cases of subincisional cortex, small pupils, flat anterior chambers, subluxated lenses, or previous damaged anterior segments. It can also minimize vitreous complications in cases of a posterior capsule rupture.

Humans↗
PubMed1991

Leukoplakia of the cornea presenting as fingerprint epithelial lines: a case report.

Opacities in association with fingerprint patterns of the epithelium were seen in the upper half of the right cornea of a 52-year-old patient complaining of decreased vision. Removal of the corneal epithelium from the involved area resulted in visual improvement and normalization of corneal appearance. Histological examination of the removed epithelium failed to reveal the typical intraepithelial formation of basement membrane invaginations even in the areas corresponding to the fingerprint patterns. Moderate to severe degree of atypia were seen in the epithelial cells. No abnormalities were observed in 3 conjunctival specimens excised at the time of epithelial removal. The diagnosis of corneal dysplasia (leukoplakia) was made. Our report is the first description of epithelial fingerprint patterns of the cornea associated with leukoplakia.

Basement Membrane↗
PubMed1990

Complications of sulcus-supported intraocular lenses with iris sutures, implanted during penetrating keratoplasty after intracapsular cataract extraction.

In a retrospective study, the authors analyzed visual results and postoperative complications in a series of 14 consecutive patients who had undergone penetrating keratoplasty and implantation of a posterior chamber intraocular lens (PC IOL) in the absence of the posterior capsule. Seven patients suffered from aphakic bullous keratopathy and seven from pseudophakic bullous keratopathy. Postoperative follow-up was 7.6 months on the average. Best-corrected postoperative visual acuity was 20/60 or better in four cases and 20/200 or better in eight. Glaucoma was present before surgery in four eyes, which persisted in all cases and developed in four new cases. Results of gonioscopic examination showed the postoperative development of goniosynechiae in four eyes. Pseudophakodonesis of various extent was present in ten eyes. Preoperatively, cystoid macular edema was diagnosed angiographically in one case. It did not improve after surgery and was seen in three additional eyes postoperatively. Causes for postoperative visual acuity lower than 20/200 were cystoid macular edema in three cases, graft rejection in one case, central retinal scar in one case, and optic nerve atrophy in one case. A distortion of the pupil was seen in three eyes in miosis and in four additional eyes in mydriasis. Corneal thickness as well as anterior chamber depth were within normal limits. Fluorophotometric evaluation of the blood-aqueous barrier showed values comparable with those obtained after intracapsular cataract extraction and implantation of an iris-fixated IOL. Despite the relatively good visual results, the high postoperative incidence of cystoid macular edema and/or glaucoma may discourage the use of this technique.

Aged↗
PubMed1990

[Polishing of protein-coated intraocular lenses with the Nd:YAG laser].

Extracapsular cataract extraction with implantation of posterior chamber IOLs has become a standard surgical technique with rare postoperative complications. However, in some patients, as a consequence of a particularly severe post-operative inflammation, proteins and pigment can be deposited on the surface of the IOL in spite of medical treatment. In certain cases such deposits can be removed by using the Nd:YAG-laser. The indications, methods and the postoperative course of this treatment are discussed.

Adult↗