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Biomedical subjects

T Neuhann

Publications and source records attributed to T Neuhann.

At least 19 recordsLinked to original sources
PubMed2000

[Correction of myopia and astigmatism using topography-assisted laser in situ keratomileusis (TopoLink LASIK)].

PATIENTS AND METHODS: We treated 114 patients (eyes) with myopia of -1 to 6 D and astigmatism of 0 to -4 D (group 1), and 89 patients (eyes) with myopia of -6.1 to -12 D and astigmatism of 0 to -4 D (group 2). All treatments were calculated on the basis of corneal topography measured with the Orbscan II system. The Keracor 217 excimer laser and the Hansatome microkeratome were used. RESULTS: At 3 months, 51 patients in the low myopia group and 40 patients in the high myopia group were available for examination. In the low (high) myopia group, 96.1% (75.0%) were within +/- 0.50 D of emmetropia, and uncorrected visual acuity was 20/20 or better in 82.4% (62.5%), 20/25 or better in 98.0% (70.0%), and 20/40 or better in 100% (95.0%). A loss of two or more lines of spectacle-corrected visual acuity occurred in 3.9% of the low and 5.0% of the high myopia group. In low myopia, spectacle-corrected visual acuity was 20/12.5 or better in 5.9% preoperatively and in 13.7% at three months and 20/15 or better in 37.3% and 47.1%, respectively (P = 0.0002 and P = 0.01). CONCLUSIONS: LASIK based on corneal topography showed very high efficacy in low and moderate myopia with astigmatism, and maximal visual acuity could even be improved in some cases. There was somewhat less precision in high myopia with astigmatism.

Astigmatism↗
PubMed2000

Treatment of myopia and myopic astigmatism by customized laser in situ keratomileusis based on corneal topography.

OBJECTIVE: To evaluate the predictability, efficacy, and safety of customized laser in situ keratomileusis (LASIK) based on corneal topography in myopia and myopic astigmatism. DESIGN: Prospective, noncomparative interventional case series. PARTICIPANTS: One hundred fourteen patients (eyes) with myopia of -1 to -6 diopters (D) and astigmatism of 0 to -4 D (low myopia group), and 89 patients (eyes) with myopia of -6.10 to -12.00 D and astigmatism of 0 to -4.00 D (high myopia group). INTERVENTION: LASIK was performed with the Hansatome Microkeratome and the Keracor 217 spot-scanning excimer laser (Bausch & Lomb Surgical Technolas, Munich, Germany). Individual ablation patterns were calculated on the basis of elevation data obtained with the Orbscan II corneal topography system (Bausch & Lomb Surgical, Irvine, CA). MAIN OUTCOME MEASURES: Manifest spectacle refraction, visual acuity, and change in visual acuity at 3 months after surgery. RESULTS: At 3 months, 51 patients in the low myopia group and 40 patients in the high myopia group were available. In the low (high) myopia group, 96.1% (75.0%) were within +/-0.50 D of emmetropia, and uncorrected visual acuity was 20/20 or better in 82.4% (62.5%), 20/25 or better in 98.0% (70.0%), and 20/40 or better in 100% (95.0%). A loss of two or more lines of spectacle-corrected visual acuity occurred in 3.9% of the low and 5. 0% of the high myopia group. In low myopia, spectacle-corrected visual acuity was 20/12.5 or better in 5.9% preoperatively and in 13.7% at 3 months and 20/15 or better in 37.3% and 47.1%, respectively. Differences were statistically significant. CONCLUSIONS: The customized LASIK based on corneal topography used in this study showed high predictability and efficacy in myopia and myopic astigmatism of -1.00 to -6.00 D, and could possibly improve spectacle-corrected visual acuity in myopia of -1.00 to -6.00 D. Predictability and efficacy were somewhat lower in myopia and myopic astigmatism of -6.10 to -12.00 D. In both groups, a small number of patients lost two or more lines of spectacle-corrected visual acuity.

Astigmatism↗
PubMed1990

Development, advantages, and methods of the continuous circular capsulorhexis technique.

The development of the continuous circular capsulorhexis (CCC) technique has contributed significantly to the safety and effectiveness of cataract extraction and intraocular lens implantation. This technique facilitates every size of smooth, circular, capsular opening, and it produces a strong capsular rim that resists tearing even when stretched during lens material removal or lens implantation. Maintaining the general integrity of the eye and facilitating such procedures as hydrodissection, endolenticular phacoemulsification, capsule polishing, and safe lens implantation in both adults and children are some of the advantages of CCC. This procedure can be performed in several ways, and it has been proven to be consistently reproducible by experienced surgeons.

Cataract Extraction↗
PubMed1988

[Neuhann capsulorhexis: a technic for reliable implantation of the capsule sack].

The Neuhann Capsulorhexis allows for a continuous, circular opening in the anterior lens capsule. After excavation of the lens matter the circular round edge in the anterior capsule provides maximum stability in the zonulolenticular diaphragm and facilitates controlled in-the-bag implantation of the lens haptic. Histologic studies of cadaver eyes have revealed that the correlation between the position of the lens loops as intended by the surgeon intraoperatively and their actual positioning is poor. It has therefore not been possible to prove the advantages of all-in-the-bag implantation as compared to sulcus fixation. The Neuhann Capsulorhexis reduces the morphological variability of the anterior capsule; furthermore, the position of the lens haptic can easily be determined both intraoperatively as well as postoperatively. This is a prerequisite for evaluating the best position for the lens haptic as well as for clinical evaluation of new types of intraocular lens.

Humans↗
PubMed1987

[Theory and surgical technic of capsulorhexis].

Kapsulorhexis is a surgical technique for opening the anterior lens capsule with a circular, smooth-edged and continuous margin. Basically, the technique consists of a precisely controlled continuous capsular tear (rhexis), using only a sharp disposable needle with a bent tip. The method is reproducible, requires minimal instrumentation, is compatible with all current techniques of extracapsular surgery, and can be learned at no risk.

Cataract Extraction↗
PubMed1983

[Papillomatous hyperplastic conjunctivitis caused by contact lenses].

The characteristic features of contact lens-induced giant papillary conjunctivitis, as observed in 64 cases between 1978 and 1980, are described. The main symptoms are increasing lens intolerance with foreign body sensation, mucus discharge and reduced vision. The typical subtarsal sign is cobblestone formation resembling vernal conjunctivitis. Therapy must achieve complete disappearance of the conjunctival lesions, to avoid recurrences. Discontinuing lens wear is sufficient only in the less pronounced cases (stage I and II). In the fully developed cases, additional cryocoagulation of the lesions proved to be effective. The differences in the clinical pattern between our group of patients and that of Allansmith et al. (1977) support the opinion that surface deposits on the contact lenses are pathogenetically of prime importance.

Adult↗