torische linsen implantation

The mean steepest K measurement was 44.1 ± 1.7 D, the median keratometric astigmatism 0.89 D (range 0.0–6.5 D) and the steepest corneal meridian was horizontal in 50% and vertical in 43%. Non-refractive reasons for poor visual acuity included amblyopia (n = 5), macular degeneration (n = 4). At a postoperative gate of 6 weeks, 6 months, before partial suture removal and after complete suture removal, corneal topography (TMS1, Tomey, Tennenlohe, Germany), keratometry, visual acuity and subjective refraction were assessed. For calculation of residual spectacle refraction, a pencil of rays is traced backwards from the retina through the toric lens implant and the cornea to the spectacle plane. Plate haptic IOLs show greater rotational stability than do loop haptics made from polypropylene once capsular fusion has taken place. Calculations of corneal power after corneo-refractive surgery from keratometry and change of spectacle refraction: some considerations on the "clinical history method". The mean postoperative astigmatism after 6 months was 0.56 D with an axis of 31 degrees. Conclusion: Implantation of a toric intraocular lens in pseudophakic eyes allows the correction of high astigmatism after penetrating keratoplasty. Weitere Infos zu diesem Thema finden Sie auf der Seite Trockene Augen . 2. Mittel der Wahl, einen hohen Hornhautastigmatismus im Rahmen einer Kataraktextraktion bzw. This is the first report of implantation of a toric phakic IOL in North America. Implantation and intraoperative alignment of the toric IOL were uneventful. multifokale Linsen und Tag-und-Nacht Linsen vertreten. Postoperative HOAs, point spread function (PSF) and modulation transfer function (MTF), residual objective refractive astigmatism, and IOL alignment were evaluated using Optical Path Difference (OPD)-Scan II (Nidek, Gamagori, Japan). In example 2 we compute a 'thick toric lens', which has to compensate for an oblique corneal astigmatism and rotate the spectacle cylinder to the against the rule position to enhance near vision. The article reviews some of the basic optics of astigmatism and the correction of astigmatism with cylindric lenses. eines refraktiven Eingriffs auszugleichen. therefore, RLE should mainly be used for patients with beginning or existing presbyopia. to report the specifications of all tIOLs that are currently available commercially. At a postoperative gate of 6 weeks, 6 months, before partial suture removal and after complete suture removal, corneal topography (TMS1, Tomey, Tennenlohe, Germany), keratometry, visual acuity and subjective refraction were assessed. Foldable Academy Zermatt (FAZ) (523) Bilaterale Kataraktchirurgie mit dem ZIEMER Z8 Femtosekundenlaser 302. Toric posterior chamber IOLs are determined by solving a linear equation system. Corneal astigmatism was 13.4 diopters (D) because he had had a penetrating keratoplasty 27 years before. All procedures (7.5 mm in dystrophies, 8.0 mm in keratoconus, 8 orientation teeth, double-running 10-0 nylon suture) were performed by one surgeon. Patients ranked their surgical outcome on a scale from 1 (very good) to 6 (poor) which resulted in a mean score of 1.9 (± 1.0; min. The purpose of this article is to present a vergence-based calculation scheme for TPCLs and PTLs. A more nasal reenclavation of the TP IOL decreased the coma, and the uncorrected visual acuity was 20/20. The . 2007;26(10):1182-3. Die torische Intra­okular­linse, die unter anderem bei der Opera­tion des Grauen Stars zum Einsatz kommt, ermög­licht nicht nur die Thera­pie der Krank­heit, sondern zusätzlich die Korrek­tur Ihrer Horn­haut­ver­krüm­mung!Damit können Sie ein von Brille oder Kontakt­linsen unab­häng­iges Leben führen. The patient's age did not influence the amount of globe rotation. To describe 1) how to determine toric (posterior chamber) intraocular lenses (IOLs) with standard formulas, 2) a matrix-based calculation scheme for determining toric IOLs using 4x4 matrices, 3) a method to determine residual refraction after implantation of an arbitrary toric lens, and 4) to address clinical aspects. All patients had high anisometropia and contact lens incompatibility. calculations with clinical examples, and to show the impact of lens dislocation (especially rotation) on refractive outcome. A set of Zernike coefficients with radial degree 8 was calculated to fit two model surfaces: a complete representation (TOTAL) and a representation with parabolic terms only to define an approximate spherocylindrical surface (PARABOLIC). Die beiden Kompressionsnähte (Nylon 10-0) wurden radiär im flachen Meridian gelegt. The longer toric IOL had excellent early rotational stability. The tendency toward counterclockwise rotation would not preclude good performance of a toric model of the IOL. Nichtrefraktive Gründe für Visusminderung waren Amblyopie (n = 5), Makulopathie (n = 4), Glaukom (n = 4), Katarakt (n = 2) und sonstige (n =5). implantation due to postoperative visual side effects or the reduced . In example 2, the focal distance changed inconclusively (21.1 mm, 21.0 mm, and 21.3 mm) with the pupil size (2 mm, 3 mm, and 5 mm). Besteht vor der Grauer Star Operation eine Hornhautverkrümmung (=Astigmatismus), kann dieser eventuell durch spezielle Linsen ausgeglichen werden. Daher gibt es auch kein Fremdkörpergefühl. 4. Refractive surfaces are added to the vergence in component notation, whereas the transformation of the vergence through media is performed in the standard notation for both cardinal meridians. The purpose of this review article is to present an en bloc mathematical strategy for calculating pseudophakic and phakic toric lenses and for deriving the spectacle refraction after implantation of an arbitrary lens. After suture removal, a corneal flattening of about 3 diopters occurred. 15.01.2018 Wiener Ophthalmologische Gesellschaft (WOG) All eyes had uneventful implantation of a toric phakic IOL through a superior scleral tunnel incision at 12 o'clock. Penetrating keratoplasty was performed in 1997 because of a decompensated keratoconus. For calculating TPCLs, the vergences in front of and behind the predicted pseudophakic lens position are determined and subtracted. High postkeratoplasty astigmatism remains a challenge for the surgeon. In 85% of the cases IOL rotation was less than 5 degrees. The incisions were made along the meridian of maximum dioptric power in a sector extending for 60 +/- 15 degrees (6 mm diameter). Uncorrected visual acuity increased from light perception to 1/20, corrected visual acuity increased to 1/10. Raytracing of corneal topography height data based on refined eye models with the option of auto-focussing has the potential to trace the optical resolution of the eye for arbitrary objects. If preoperative keratometric diopters and refraction are not known, average central power on the postoperative videokeratograph may be used after RK, but refined calculation of keratometric diopters from radius of anterior and posterior corneal surface should be used after PRK and/or LASIK. In- and excyclorotations showed a coincidental distribution and no side differences. In Gaussian optics (in the paraxial space), spherocylindrical optical surfaces can be described in a mathematically equivalent formulation as vergences. Zudem wird auf die intraoperative Positionierung der Linse Keratoplasty was performed two years earlier. Early IOL rotation (surgery to 2 weeks postoperatively) was graded as mild (<10 degrees), moderate (10 to 30 degrees), or severe (>30 degrees) by semiobjective comparison of the images. sowie die Auswirkungen einer Dislokation (speziell Rotation) eingegangen. The iteration algorithm is initialized with a spherical front and a toric back surface and stepwise decreases the image distortion by adding cylinder lenses to the front lens surface corrected by the toric lens back surface. Seven eyes with corneal astigmatism of less than 1.5 D were implanted with the AcrySof SA60T3 intraocular lens. Sometimes conservative treatment modalities like glasses or contact lenses fail to correct the keratoplasty-associated astigmatism. Von den präoperativen Topographien wurden 27% in Gruppe 1 und 2 (regulär) und nur 10% in Gruppe 5 und 6 (irregulär) klassifiziert. The angular offset/distance between the fundus orientation line and the tIOL marker line was analyzed for each bifocal image at different time points. Sie einzusetzen, erfordert von der Ärztin enorm viel Erfahrung und Fingerspitzengefühl, weil die Linse je nach Lage der Hornhautverkrümmung ganz exakt positioniert werden muss. At last follow-up, 31 eyes (83.8%) had a spherically corrected and 34 (91.9%) a best corrected visual acuity of 0.5 (20/40) or better. Background. 2015;31(10):699-707. Die körpereigene Augenlinse wird durch eine künstliche Intraokularlinse (IOL) ersetzt. ner refraktiven Fläche aufaddiert wer-, zylindrischen Brille oder einer (formsta-. The mean total refractive astigmatism could be reduced from 4.16 D±1.58 D preoperatively to 1.64 D±1.21 D postoperatively. The difference between the mean intended cylinder axis and achieved cylinder axis was 3.9 degrees (median 3 degrees; range to 13 degrees). Betrachtet man jedoch den einzelnen Patienten, so bleibt weiterhin die unsichere Vorhersagbarkeit der induzierten Änderung als wesentlicher Nachteil des Verfahrens bestehen. Background Visual acuity following penetrating keratoplasty is frequently limited by excessive astigmatism which cannot be compensated for with spectacles or contact lenses. B. nach Lasereingriffen. 2. Bei 25 Patienten war der Grund der Keratoplastik Keratokonus (45%), bei 17 Narben (30%) und bei 11 Dystrophien (20%). Implantationstechniken sowie verschiedene den jeweiligen Sehanforderungen des Patienten angepasste Optikdesigns der IOL zur profitieren von der Implantation einer torischen Linse. Induced astigmatism should be taken into consideration during preoperative planning. Ob monofokale oder torische Linsen. Using the bifocal photography, the mean tlOL rotation was 1.9 ± 1.3° (range: 0-5.0°). to present a matrix-based calculation scheme for pseudophakic and phakic toric lenses, to explicitly demonstrate the step-by-step Background: After the implantation of toric intraocular lenses (tlOLs) significant postoperative tIOL rotation angles were measured occasionally. The purpose of this educational and training article is to familiarize the reader with the The purpose of the study was to determine the effects of arcuate keratotomies and compression sutures on the amount and regularity of corneal astigmatism and on the visual acuity best-corrected visual acuity, which is the default value for the postoperative uncorrected visual acuity. The mean age of the group was 74.9 +/- 9.8 years (mean +/- SD) with a female predominance (62%). The main complications for myopic RLA include retinal detachment, while hyperopic refractive lens exchange may be associated with surgical problems in the narrower anterior eye segment. Die Augenklinik Herisau Appenzell empfiehlt in etwa 5% der Fälle den Einsatz von torischen Linsen. A clinical assessment, including refraction, keratometry (K), A-scan ultrasound and Orbscan II computerized topography was performed on each eye. This model can be generalised easily to a thick lens model, if the appropriate geometric parameters of both lens surfaces are known. The presented calculation scheme allows determination of"thin" TPCLs or PTLs to achieve spherocylindrical target refraction with a cylinder axis at random or to predict the postoperative refraction for any toric lens implanted in any axis. Pseudophake und phake torische Linsen zur Korrektur des kornealen Astigmatismus - Theorie und klinische Aspekte. A retrospective study of 44 eyes in 33 patients. To evaluate the rotational stability of the three types of AcrySof SA60TT toric intraocular lenses (Alcon, Switzerland) in cataract surgery after the first postoperative week. In 57.3 % of the eyes a rotation of less than 3° and in 33.6% of more than or equal to 3° was detected. RESULTS: There was no significant change in the parameters evaluated between the 6-month and 1.5-year follow-ups. This clinical trial was conducted to evaluate visual acuity, refraction and rotation after implantation of the foldable toric intraocular lens (IOL) MicroSil® Toric. The median late rotation was 6.8 degrees for loop haptics compared to 0.6 degrees for plate haptics (P = 0.0073). Sollen andere Augenleiden (mit)behandelt werden, so stehen spezielle Linsen für das Erreichen der bestmöglichen Sehkraft zur Verfügung. Im Buch gefunden – Seite 136Auch die torische IOL der Firma STAAR (AA-42o3T) mit 1o,8 mm Länge [6] erscheint nicht ausreichend dimensioniert zu sein. ... Noch eleganter wäre es allerdings, eine verlängerte IOL nur in jene Augen zu implantieren, die sie tatsächlich ... Implantation and intraoperative alignment of tIOL were uneventful in all patients. Corneal topographic (keratometric) maps were classified into five groups: 34% round, 10% oval, 31% symmetrical bow tie, 12% asymmetrical bow tie and 13% irregular. Working examples MATERIAL AND METHODS: An overview is presented on procedures to correct astigmatism during cataract surgery, based on a seletive literature review and the authors" own experience. The algorithm was realised with a C code on the LINUX platform and applied to a normal eye (example 1, TMS-1), an eye with severe keratoconus (example 2, TMS-1) and an eye with corneal scars (example 3, Orbscan). Summary An ARTISAN toric intraocular lens with - 3 D spherical and 7.0 D/0 degrees cylindrical power (individually manufactured) was implanted via a sclerocorneal tunnel incision into the anterior chamber. To evaluate the first 100 consecutive cases of toric posterior chamber silicone intraocular lens (IOL) implantation by 2 community-based ophthalmologists. Diese Fehlsichtigkeit lässt sich durch torische Sonderlinsen ausgleichen. 2. The concept can be easily generalized to 'thick' toric intraocular lenses if the geometrical data and the refraction index of the material are known. Randomized, controlled trial. to report the specifications of all tIOLs that are currently available commercially. Comparison of eye position at the time of measurement to eye position at the time of surgery can be used to adjust the laser ablation algorithm to compensate for this rotational displacement. Case: A 66-year-old patient presented after penetrating keratoplasty and implantation of an IOL 4 years ago with a visual acuity of 20/160 and residual astigmatism of -10Dx151°. Überprüfen Sie die Übersetzungen von 'torische' ins Estnisch. Results. Postoperative IOL position was documented using digital retroillumination images at 2 weeks and 6 months after surgery. astigmatism: in cataract surgery cases with implantation of a posterior chamber lens and in refractive surgery cases with Toric IOL axis misalignment was 2.65±2.39 degrees and no correlation with HOAs was found. to provide clinical recommendations for the implantation of toric lenses, and Der genaue Betrag ist in erster Linie abhängig vom optimalen Linsentyp, aber auch der Erfahrung und Ausstattung der Klinik. Fast Fourier transformation of the data sets in the mid periphery (1.4-1.8 mm apical distance) was done to get DC-, one-cycle and two-cycle component. Today’s techniques and implants, however, offer surgeons the chance to individualise patients postoperative astigmatism and thus increase overall patient satisfaction. Refractive astigmatism was with-the-rule in 15%, against-the-rule in 50% and oblique in 15%, with 20% spherical. A Java-based program JPhakicIOL was used for calculation of the examples and is provided online for teaching and experimental purposes. Stoke Mandeville Hospital, Aylesbury, United Kingdom. Hintergrund Hoher Astigmatismus ist ein wichtiger Grund für eine geringe Sehleistung nach ansonsten „erfolgreicher” Keratoplastik, da hierbei eine Korrektur mit Brille oder Kontaktlinse oft unmöglich ist. The IOL axis was recorded at 1 day, 1 week, and a final follow-up visit. Torische Linsen wurden speziell für den Ausgleich von regulären Hornhautverkrümmungen entwickelt. Fourier coefficients were correlated with keratometric readings, subjective refractive values and visual acuity. Results The mean preoperative astigmatism was 10.8±3.1 (4.2 to 19.2) diopters (D). Patienten mit höhergradigen Hornhautverkrümmungen (Astigmatismen > 1,25 Dpt.) Definition of successful surgery is even broader when a significant reduction of astigmatism that usually allows the use of spectacles or contact lenses is considered. The mean steepest K measurement was 44.1 +/- 1.7 D, the median keratometric astigmatism 0.89 D (range 0.0-6.5 D) and the steepest corneal meridian was horizontal in 50% and vertical in 43%. Six months after implantation the IOL was still well-centered and uncorrected visual acuity was 20/20. Alle Operationen (7,5 mm bei primären Dystrophien, 8,0 mm bei Keratokonus, 8 Orientierungszähnchen, doppelt fortlaufende 10-0-Nylon-Naht nach Hoffmann) wurden von einem Operateur durchgeführt. Methods WORKING EXAMPLES: In the 1(st) example, the power of a thin TPCL is determined step by step by applying the presented calculation scheme, which was designed to be transferred directly to a simple computer program (e.g., Microsoft Excel). In example 1 we calculate a 'thin toric lens' for compensation of a corneal astigmatism to achieve a spherical target refraction. For a final conclusion of the endothelial cell loss longer follow-up is necessary. The implantation of an ARTISAN toric intraocular lens presents an additive option to correct corneal astigmatism in phakic eyes. If contact lens or spectacle correction is not viable, little debate exists that the secondary placement of an intra-ocular lens (IOL) is the method of choice in the absence of capsular support. If IOL rotation occurs, it is usually during the first week and can be remedied by repositioning the IOL at 1 week. Conclusions: Seven and a half degrees or 3° tIOL rotation would correspond to a residual astigmatism of 26% or 10%. By Fritz Hengerer Fressen, nicht-gefressen-Werden, Paarungspartner finden und Junge erfolgreich aufziehen Peter Kappeler erläutert, ausgehend von den vier "Grundproblemen", die jedes Tier lösen muss, die Verhaltensbiologie als integrative Disziplin der ... Generell gilt, das Bifokallinsen günstiger sind als Trifokallinsen. She was contact lens intolerant but was not a good candidate for laser in situ keratomileusis because of a thin cornea. 28 degrees). To evaluate deviations in the axis (intended versus achieved) and postoperative astigmatism after implantation of an Artisan toric phakic intraocular lens (IOL). In difficult cases, standard calculation schemes are overemployed and new mathematical algorithms are necessary to adequately address these problems. To compare higher-order aberrations (HOAs) and optical quality in eyes implanted with AcrySof SN60TT toric intraocular lens (IOL) or with non-toric AcrySof SN60AT IOL (Alcon Laboratories, Inc., Fort Worth, TX). From fourier coefficients conclusions may be drawn concerning potential best-corrected visual acuity and amplitude/axis of subjective cylinder, even in corneas with severe local irregularities. In all 37 eyes, the axis of the toric IOL remained within 30 degrees of rotation. The matrix method of tracing a paraxial ray through a coaxial optical system that contains spherical refracting elements requires a 2 x 2 system matrix. a) Monofokale Linsen. Ziel der Studie war es, den Einfluß von limbusparallelen Keratotomien mit Kompressionsnähten auf Höhe und Regularität des Hornhaut-Astigmatismus und Visus zu untersuchen. Implantation and intraoperative alignment of the toric IOL were uneventful. ... Viestenz et al. Methods: Postoperative refraction (+1.5 -3.0 x 90) and BCVA remained stable for 7 months. Methods: 3. Großzügiger gestaltet sich die Indikation, wenn primär die Reduzierung des bestehenden Astigmatismus beabsichtigt wird, welche die Korrektur mittels Brillen bzw. The Add-On IOL (HumanOptics AG, Erlangen,Germany) is a line of sulcus-fixated silicone lensesdesigned for piggyback implantation inpseudophakic patients. The eye with the capsular tension ring showed no morphological or refractive changes during follow-up. Because of the significant amount of spontaneous globe rotation we developed the following enhanced methods to minimize measurement errors of tlOL rotation: 2. In the last decades, toric posterior chamber lenses (TPCLs) for cataract surgery and phakic toric lenses (PTLs) for refractive surgery have become more and more popular for correcting high or excessive corneal astigmatism. Because of these refinements in technique and technology, the field of cataract and implant surgery has emerged as a true and recognized form of refractive surgery. This individually designed IOL can be implanted additionally to the existing IOL. In spite of the high requirements for postoperative Astigmatism averaged 1.0 diopter in phakic eyes preoperatively, showing a mean increase of only 0.5 diopter in aphakic eyes and 0.65 diopter in pseudophakic eyes. The orientation of the conoid shows that leaving patients with some simple myopic "against-the-rule" astigmatism is beneficial to near work, whereas "with-the-rule" astigmatism is beneficial for distant viewing. Conclusion In laser ablation a sufficient corneal thickness must be ensured. Torische Kunstlinsen zur Korrektur eines persistierenden kornealen Astigmatismus nach perforierender Keratoplastik, [Can the implantable collamer lens with AquaPORT technology safely prevent an angle block? microincisional and astigmatism-neutral implantation techniques as well as special IOL optic designs are available. Therefore, three-piece foldable IOLs with a new haptic design are under development. After a mean follow-up of 1.1 years, the mean net astigmatism was 5.8 +/- 3.2 (0 to 16) D. The mean preoperative visual acuity (VA) was 0.38 +/- 0.31 (from 0.03 to 1.0). Der Nanolaser - auch Nano-Cat oder Nano-Katarakt genannt - ist die neueste Entwicklung im Bereich der Linsenchirurgie. From 4x4 refraction and translation matrices characterizing refractive surfaces and interspaces between refractive surfaces, a system matrix is determined characterizing the entire optical system paraxially. to describe the biometric, keratometric and topographic conditions for implantion of tIOLs, Twenty-three patients were allocated the loop haptic and 25 the plate haptic IOL. We conclude that line of sight should be measured before TP IOL implantation, especially in hyperopic eyes. First experiences after implantation of a toric PMMA IOL in three eyes from patients with cataracts are reported. Conclusion. Fourier transformation renders reconstruction of corneal topography data with a marked data reduction and a small error. Eine wichtige Erkenntnis war, dass der Nachstar in seiner Häufigkeit und Ausprägung durch diese konventionellen Maßnahmen zwar drastisch gesenkt, jedoch nicht gänzlich vermieden werden kann. Behandlungsablauf Die Operation dauert etwa 10 Minuten und ist völlig schmerzfrei. Simultaneous implantation of a capsular tension ring may improve long-term stability. We previously performed model calculations in eyes after PRK for myopia (-1.50 to -8.00 D, mean -5.40 +/- 1.90 D) using keratometry readings as measured by the Zeiss keratometer and the TMS-1 topography unit and as calculated using the "clinical history method" (spherical equivalent refraction change) and change in anterior surface keratometry readings. The difference of the angle between bifocal-image samples was defined as the real tIOL rotation angle. Linsen der Marke Air Optix können bis zu 30 Tage und 29 Nächte am Stück getragen werden und sind zudem auch als multifokale Linsen sowie als torische Linsen zur Korrektur einer Hornhautverkrümmung erhältlich. Conclusion: • The Add-On IOL is a line of sulcus-fixated silicone lenses designed for piggyback implantation in pseudophakic patients to compensate for residual spherical and astigmatic refractive errors or to correct presbyopia in . Patients presenting for cataract surgery in this study were predominantly elderly, female, of European Caucasian ethnicity and exhibited relatively poor corrected visual acuity in the affected eye. application of pseudophakic and phakic toric lenses, to show which parameters are necessary for calculating toric lenses, correct hi gh astigmatis m. J Cataract Refract Surg . Only 6% of the eyes did not rotate. Results: The mean absolute rotational angle was 2.4 ′ 1.7° (range 0 to 7.5°) in all 100 eyes (2.5 ′ 1.6° right eye, 2.4 ′ 1.7° left eye). Ein Video-Beitrag, Nachstarbildung nach Intraokularlinsenimplantation: Teil I: Genese und Prävention durch Optimierung konventioneller Linsenimplantate und Operationstechniken, Ausgleich des kornealen Astigmatismus mit torischer Intraokularlinse: Ergebnisse der Multicenterstudie, Beeinflussung der Achslagenanalyse bei torischen Intraokularlinsen durch die Bulbuszyklorotation: Vorschläge zur optimierten Evaluierung der Rotationsstabilität torischer Intraokularlinsen, Rotationsstabilität des Auges in der standardisierten Fotografie, Fourieranalyse als mathematisches Modell zur Auswertung und Darstellung von postoperativen Hornhauttopographiedaten nach nichtmechanischer perforierender Keratoplastik, Limbusparallele Keratotomien mit Kompressionsnähten zur Behandlung des hohen Astigmatismus nach perforierender Keratoplastik: Eine vektoranalytische und topographische Studie, Torische Intraokularlinse zur Korrektur eines höhergradigen Astigmatismus nach Keratoplastik bei Pseudophakie - eine Kasuistik1, Ray Vector Fields, Prentice?

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