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Jorge L. Alió - One of the best experts on this subject based on the ideXlab platform.
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Vector analysis of astigmatism correction after toric intraocular lens implantation
Journal of Cataract and Refractive Surgery, 2015Co-Authors: Eva Maria Krall, E M Arlt, Melchior Hohensinn, Sarah Moussa, Gerlinde Jell, Ana B Plazapuche, Lucia Bascaran, Javier Mendicute, Jorge L. Alió, Gunther GrabnerAbstract:Purpose To determine astigmatic changes by Vector analysis and postoperative refractive and visual outcomes after implantation of the monofocal aspheric bitoric AT Torbi 709M toric intraocular lens (IOL). Setting Three centers in Salzburg, Austria, and Alicante and San Sebastian, Spain. Design Prospective interventional case series. Methods Preoperative and postoperative visual acuity, subjective and objective refractions, and corneal radii using a topographer were examined in all patients. All patients had postoperative examinations within the first week and at 6 to 12 weeks. Astigmatic changes were evaluated using the Alpins Vector method based on 3 fundamental Vectors as follows: target induced astigmatism (TIA), surgically induced astigmatism (SIA), and Difference Vector. The various relationships between these 3 Vectors were calculated, providing an extensive description of the astigmatic correction achieved. Results Eighty-eight eyes (71 patients) were included. Postoperatively, refractive cylinder was reduced significantly ( P Conclusion Implantation of the toric IOL was safe and effective for the treatment of eyes with cataract in combination with preexisting regular corneal astigmatism over a short-term follow-up. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
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comparative analysis of clinical outcomes obtained with a new diffractive multifocal toric intraocular lens implanted through two types of corneal incision
Journal of Refractive Surgery, 2011Co-Authors: Peter Mojzis, David P Pinero, Javier Tomas, Ana B Plaza, Pavel Studeny, Vladimir Korda, Jorge L. AlióAbstract:PURPOSE: To analyze and compare the clinical outcomes obtained after cataract surgery with the implantation of a new multifocal toric intraocular lens (IOL) using two different types of corneal incision. METHODS: Retrospective study including 64 eyes of 35 patients who underwent surgery with implantation of the AT LISA 909M multifocal toric IOL (Carl Zeiss Meditec) in 2 different ophthalmologic centers using different criteria for corneal incision size: sub-1.8 mm (microincision surgery [MICS] group) and 2.2 mm (mini-incision group). Visual, refractive, and corneal topographic outcomes were evaluated during 6-month follow-up. Additionally, refractive astigmatic changes were analyzed using the Alpins Vectorial method. RESULTS: Signifi cant reductions of refractive sphere and cylinder were observed postoperatively (P� .03), with associated visual improvements for near and distance (P� .01) in both groups. Mean postoperative magnitudes of Difference Vector, torque, and magnitude of error in the overall sample were 0.52� 0.36 diopters (D), 0.36� 0.36 D, and 0.08� 0.38 D, respectively. A mean overcorrection of 4% in refractive astigmatism was found. Mean angle of error was 0.37� 5.50° and � 4.51� 13.16° for the MICS and mini-incision groups, respectively (P=.09). Signifi cant positive correlations were found between the magnitudes of torque and Difference Vector (r=0.78, P� .01) as well as between the magnitude of torque and absolute angle of error (r=0.76, P� .01).
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Vector analysis of astigmatic changes after cataract surgery with implantation of a new toric multifocal intraocular lens
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Ana B PlazaAbstract:Purpose To analyze the astigmatic changes after cataract surgery with the implantation of a new toric multifocal intraocular lens (IOL) using the Alpins Vector method. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods After cataract surgery with implantation of an AT Lisa 909M toric multifocal IOL, the visual, refractive, corneal topographic, internal astigmatism, defocus curves, and contrast sensitivity outcomes were evaluated over 6 months. Refractive astigmatic changes (target astigmatism [TIA]; surgically induced astigmatism [SIA]; Difference Vector; magnitude of error; flattening effect; torque) were analyzed using the Alpins Vectorial method. Results The study enrolled 23 eyes (12 patients). Postoperatively, there was a significant reduction in refractive cylinder ( P P =.03) and distance ( P =.01). The magnitude of SIA Vector was significantly larger than the TIA 3 months postoperatively ( P =.03). The mean magnitude of the Difference Vector was 0.67 diopter (D) ± 0.51 (SD) at 6 months. The mean magnitude of error remained positive and close to zero over the entire follow-up ( P ≥.19). The mean magnitude of torque Vector was 0.49 ± 0.54 D at 6 months. Significant positive correlation was found between the magnitude of torque and the Difference Vector ( r ≥ 0.70, P Conclusion The new toric IOL restored distance and near visual function with excellent predictability in eyes with moderate to high corneal astigmatism having cataract surgery. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
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Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Alicia AlesonAbstract:Purpose To analyze the astigmatic changes after cataract surgery with toric intraocular lens (IOL) implantation and determine the relationship between these changes and the final visual outcomes. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods This study comprised eyes with visually significant cataract that had surgery with Acrysof toric IOL implantation. Refractive, corneal topography, internal astigmatism, and contrast sensitivity outcomes were evaluated over 6 months. The Alpins Vectorial method was used to analyze the target (TIA) and surgically (SIA) induced astigmatism, Difference Vector, magnitude of error, flattening effect, and torque. Results The study enrolled 27 eyes (21 patients). Postoperatively, there was a significant reduction in refractive cylinder (P 0.19). The mean magnitude of torque Vector was 0.59 ± 0.42 D at 6 months. There was a significant negative correlation between refractive cylinder and the magnitude of torque (r ≤−0.54, P Conclusion The toric IOL restored distance visual function in eyes with cataract and significant corneal astigmatism, although there was a small trend toward undercorrection related to misalignment of treatment. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
David P Pinero - One of the best experts on this subject based on the ideXlab platform.
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comparative analysis of clinical outcomes obtained with a new diffractive multifocal toric intraocular lens implanted through two types of corneal incision
Journal of Refractive Surgery, 2011Co-Authors: Peter Mojzis, David P Pinero, Javier Tomas, Ana B Plaza, Pavel Studeny, Vladimir Korda, Jorge L. AlióAbstract:PURPOSE: To analyze and compare the clinical outcomes obtained after cataract surgery with the implantation of a new multifocal toric intraocular lens (IOL) using two different types of corneal incision. METHODS: Retrospective study including 64 eyes of 35 patients who underwent surgery with implantation of the AT LISA 909M multifocal toric IOL (Carl Zeiss Meditec) in 2 different ophthalmologic centers using different criteria for corneal incision size: sub-1.8 mm (microincision surgery [MICS] group) and 2.2 mm (mini-incision group). Visual, refractive, and corneal topographic outcomes were evaluated during 6-month follow-up. Additionally, refractive astigmatic changes were analyzed using the Alpins Vectorial method. RESULTS: Signifi cant reductions of refractive sphere and cylinder were observed postoperatively (P� .03), with associated visual improvements for near and distance (P� .01) in both groups. Mean postoperative magnitudes of Difference Vector, torque, and magnitude of error in the overall sample were 0.52� 0.36 diopters (D), 0.36� 0.36 D, and 0.08� 0.38 D, respectively. A mean overcorrection of 4% in refractive astigmatism was found. Mean angle of error was 0.37� 5.50° and � 4.51� 13.16° for the MICS and mini-incision groups, respectively (P=.09). Signifi cant positive correlations were found between the magnitudes of torque and Difference Vector (r=0.78, P� .01) as well as between the magnitude of torque and absolute angle of error (r=0.76, P� .01).
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Vector analysis of astigmatic changes after cataract surgery with implantation of a new toric multifocal intraocular lens
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Ana B PlazaAbstract:Purpose To analyze the astigmatic changes after cataract surgery with the implantation of a new toric multifocal intraocular lens (IOL) using the Alpins Vector method. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods After cataract surgery with implantation of an AT Lisa 909M toric multifocal IOL, the visual, refractive, corneal topographic, internal astigmatism, defocus curves, and contrast sensitivity outcomes were evaluated over 6 months. Refractive astigmatic changes (target astigmatism [TIA]; surgically induced astigmatism [SIA]; Difference Vector; magnitude of error; flattening effect; torque) were analyzed using the Alpins Vectorial method. Results The study enrolled 23 eyes (12 patients). Postoperatively, there was a significant reduction in refractive cylinder ( P P =.03) and distance ( P =.01). The magnitude of SIA Vector was significantly larger than the TIA 3 months postoperatively ( P =.03). The mean magnitude of the Difference Vector was 0.67 diopter (D) ± 0.51 (SD) at 6 months. The mean magnitude of error remained positive and close to zero over the entire follow-up ( P ≥.19). The mean magnitude of torque Vector was 0.49 ± 0.54 D at 6 months. Significant positive correlation was found between the magnitude of torque and the Difference Vector ( r ≥ 0.70, P Conclusion The new toric IOL restored distance and near visual function with excellent predictability in eyes with moderate to high corneal astigmatism having cataract surgery. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
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Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Alicia AlesonAbstract:Purpose To analyze the astigmatic changes after cataract surgery with toric intraocular lens (IOL) implantation and determine the relationship between these changes and the final visual outcomes. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods This study comprised eyes with visually significant cataract that had surgery with Acrysof toric IOL implantation. Refractive, corneal topography, internal astigmatism, and contrast sensitivity outcomes were evaluated over 6 months. The Alpins Vectorial method was used to analyze the target (TIA) and surgically (SIA) induced astigmatism, Difference Vector, magnitude of error, flattening effect, and torque. Results The study enrolled 27 eyes (21 patients). Postoperatively, there was a significant reduction in refractive cylinder (P 0.19). The mean magnitude of torque Vector was 0.59 ± 0.42 D at 6 months. There was a significant negative correlation between refractive cylinder and the magnitude of torque (r ≤−0.54, P Conclusion The toric IOL restored distance visual function in eyes with cataract and significant corneal astigmatism, although there was a small trend toward undercorrection related to misalignment of treatment. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
Javier Tomas - One of the best experts on this subject based on the ideXlab platform.
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comparative analysis of clinical outcomes obtained with a new diffractive multifocal toric intraocular lens implanted through two types of corneal incision
Journal of Refractive Surgery, 2011Co-Authors: Peter Mojzis, David P Pinero, Javier Tomas, Ana B Plaza, Pavel Studeny, Vladimir Korda, Jorge L. AlióAbstract:PURPOSE: To analyze and compare the clinical outcomes obtained after cataract surgery with the implantation of a new multifocal toric intraocular lens (IOL) using two different types of corneal incision. METHODS: Retrospective study including 64 eyes of 35 patients who underwent surgery with implantation of the AT LISA 909M multifocal toric IOL (Carl Zeiss Meditec) in 2 different ophthalmologic centers using different criteria for corneal incision size: sub-1.8 mm (microincision surgery [MICS] group) and 2.2 mm (mini-incision group). Visual, refractive, and corneal topographic outcomes were evaluated during 6-month follow-up. Additionally, refractive astigmatic changes were analyzed using the Alpins Vectorial method. RESULTS: Signifi cant reductions of refractive sphere and cylinder were observed postoperatively (P� .03), with associated visual improvements for near and distance (P� .01) in both groups. Mean postoperative magnitudes of Difference Vector, torque, and magnitude of error in the overall sample were 0.52� 0.36 diopters (D), 0.36� 0.36 D, and 0.08� 0.38 D, respectively. A mean overcorrection of 4% in refractive astigmatism was found. Mean angle of error was 0.37� 5.50° and � 4.51� 13.16° for the MICS and mini-incision groups, respectively (P=.09). Signifi cant positive correlations were found between the magnitudes of torque and Difference Vector (r=0.78, P� .01) as well as between the magnitude of torque and absolute angle of error (r=0.76, P� .01).
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Vector analysis of astigmatic changes after cataract surgery with implantation of a new toric multifocal intraocular lens
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Ana B PlazaAbstract:Purpose To analyze the astigmatic changes after cataract surgery with the implantation of a new toric multifocal intraocular lens (IOL) using the Alpins Vector method. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods After cataract surgery with implantation of an AT Lisa 909M toric multifocal IOL, the visual, refractive, corneal topographic, internal astigmatism, defocus curves, and contrast sensitivity outcomes were evaluated over 6 months. Refractive astigmatic changes (target astigmatism [TIA]; surgically induced astigmatism [SIA]; Difference Vector; magnitude of error; flattening effect; torque) were analyzed using the Alpins Vectorial method. Results The study enrolled 23 eyes (12 patients). Postoperatively, there was a significant reduction in refractive cylinder ( P P =.03) and distance ( P =.01). The magnitude of SIA Vector was significantly larger than the TIA 3 months postoperatively ( P =.03). The mean magnitude of the Difference Vector was 0.67 diopter (D) ± 0.51 (SD) at 6 months. The mean magnitude of error remained positive and close to zero over the entire follow-up ( P ≥.19). The mean magnitude of torque Vector was 0.49 ± 0.54 D at 6 months. Significant positive correlation was found between the magnitude of torque and the Difference Vector ( r ≥ 0.70, P Conclusion The new toric IOL restored distance and near visual function with excellent predictability in eyes with moderate to high corneal astigmatism having cataract surgery. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
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Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Alicia AlesonAbstract:Purpose To analyze the astigmatic changes after cataract surgery with toric intraocular lens (IOL) implantation and determine the relationship between these changes and the final visual outcomes. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods This study comprised eyes with visually significant cataract that had surgery with Acrysof toric IOL implantation. Refractive, corneal topography, internal astigmatism, and contrast sensitivity outcomes were evaluated over 6 months. The Alpins Vectorial method was used to analyze the target (TIA) and surgically (SIA) induced astigmatism, Difference Vector, magnitude of error, flattening effect, and torque. Results The study enrolled 27 eyes (21 patients). Postoperatively, there was a significant reduction in refractive cylinder (P 0.19). The mean magnitude of torque Vector was 0.59 ± 0.42 D at 6 months. There was a significant negative correlation between refractive cylinder and the magnitude of torque (r ≤−0.54, P Conclusion The toric IOL restored distance visual function in eyes with cataract and significant corneal astigmatism, although there was a small trend toward undercorrection related to misalignment of treatment. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.
Niranjan M. Devashrayee - One of the best experts on this subject based on the ideXlab platform.
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Weighted transition based reordering, columnwise bit filling, and Difference Vector: a power-aware test data compression method
Vlsi Design, 2011Co-Authors: Usha Mehta, Kankar S. Dasgupta, Niranjan M. DevashrayeeAbstract:Test data compression is the major issues for the external testing of IP core-based SoC. From a large pool of diverse available techniques for compression, run length-based schemes are most appropriate for IP cores. To improve the compression and to reduce the test power, the test data processing schemes like "don't care bit filling" and "reordering" which do not require any modification in internal structure and do not demand use of any test development tool can be used for SoC-containing IP cores with hidden structure. The proposed "Weighted Transition Based Reordering-Columnwise Bit Filling-Difference Vector (WTRCBF-DV)" is a modification to earlier proposed "Hamming Distance based Reordering--Columnwise Bit Filling and Difference Vector." This new method aims not only at very high compression but also aims at shift in test power reduction without any significant on-chip area overhead. The experiment results on ISCAS89 benchmark circuits show that the test data compression ratio has significantly improved for each case. It is also noteworthy that, in most of the case, this scheme does not involve any extra silicon area overhead compared to the base code with which it used. For few cases, it requires an extra XOR gate and feedback path only. As application of this scheme increases run length of zeroes in test set, as a result, the number of transitions during scan shifting is reduced. This may lower scan power. The proposed scheme can be easily integrated into the existing industrial flow.
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hamming distance based reordering and columnwise bit stuffing with Difference Vector a better scheme for test data compression with run length based codes
International Conference on VLSI Design, 2010Co-Authors: Usha S Mehla, Kankar S. Dasgupta, Niranjan M. DevashrayeeAbstract:Because of increased design complexity and advanced fabrication technologies, the number of tests and corresponding data volume increases rapidly. As the large size of test data volume is becoming one of the major problems in testing System-on-a-Chip (SoC), several compression coding schemes have been proposed in past. Run Length Coding is one of the most familiar coding methodologies for compression. In this paper, we present a new scheme named Hamming Distance Based Reordering and Column wise Bit Stuffing with Difference Vector (HDR-CBS-DV), which can be used with any run length based code technique for better compression ratio. Four techniques have been applied in this scheme: Selection of first Vector, Hamming Distance Based Reordering, Columnwise Bit Stuffing and Difference Vector. Instead of directly applying any known run length code like Golomb, Frequency Directed Run Length (FDR), Extended FDR (EFDR), Modified FDR (MDFR) or Shifted Alternate FDR (SAFDR) to given test set, if we apply the proposed scheme to test set prior to applying the run length base code, the compression obtained is improved drastically. The experimental results on ISCAS89 Benchmark circuits shows that the test data compression ratio improves significantly for each case. It is also noteworthy that in most of the case, this scheme does not involve any extra silicon area over-head compared to the base code with which it used. For few cases, it requires an extra XOR gate and feedback path only. The proposed scheme can be easily integrated into the existing industrial flow.
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VLSI Design - Hamming Distance Based Reordering and Columnwise Bit Stuffing with Difference Vector: A Better Scheme for Test Data Compression with Run Length Based Codes
2010 23rd International Conference on VLSI Design, 2010Co-Authors: Usha S Mehla, Kankar S. Dasgupta, Niranjan M. DevashrayeeAbstract:Because of increased design complexity and advanced fabrication technologies, the number of tests and corresponding data volume increases rapidly. As the large size of test data volume is becoming one of the major problems in testing System-on-a-Chip (SoC), several compression coding schemes have been proposed in past. Run Length Coding is one of the most familiar coding methodologies for compression. In this paper, we present a new scheme named Hamming Distance Based Reordering and Column wise Bit Stuffing with Difference Vector (HDR-CBS-DV), which can be used with any run length based code technique for better compression ratio. Four techniques have been applied in this scheme: Selection of first Vector, Hamming Distance Based Reordering, Columnwise Bit Stuffing and Difference Vector. Instead of directly applying any known run length code like Golomb, Frequency Directed Run Length (FDR), Extended FDR (EFDR), Modified FDR (MDFR) or Shifted Alternate FDR (SAFDR) to given test set, if we apply the proposed scheme to test set prior to applying the run length base code, the compression obtained is improved drastically. The experimental results on ISCAS89 Benchmark circuits shows that the test data compression ratio improves significantly for each case. It is also noteworthy that in most of the case, this scheme does not involve any extra silicon area over-head compared to the base code with which it used. For few cases, it requires an extra XOR gate and feedback path only. The proposed scheme can be easily integrated into the existing industrial flow.
Alicia Aleson - One of the best experts on this subject based on the ideXlab platform.
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Vector analysis of astigmatic changes after cataract surgery with toric intraocular lens implantation
Journal of Cataract and Refractive Surgery, 2011Co-Authors: Jorge L. Alió, David P Pinero, Javier Tomas, Alicia AlesonAbstract:Purpose To analyze the astigmatic changes after cataract surgery with toric intraocular lens (IOL) implantation and determine the relationship between these changes and the final visual outcomes. Setting Vissum-Instituto de Oftalmologico de Alicante, Alicante, Spain. Design Prospective case series. Methods This study comprised eyes with visually significant cataract that had surgery with Acrysof toric IOL implantation. Refractive, corneal topography, internal astigmatism, and contrast sensitivity outcomes were evaluated over 6 months. The Alpins Vectorial method was used to analyze the target (TIA) and surgically (SIA) induced astigmatism, Difference Vector, magnitude of error, flattening effect, and torque. Results The study enrolled 27 eyes (21 patients). Postoperatively, there was a significant reduction in refractive cylinder (P 0.19). The mean magnitude of torque Vector was 0.59 ± 0.42 D at 6 months. There was a significant negative correlation between refractive cylinder and the magnitude of torque (r ≤−0.54, P Conclusion The toric IOL restored distance visual function in eyes with cataract and significant corneal astigmatism, although there was a small trend toward undercorrection related to misalignment of treatment. Financial Disclosure No author has a financial or proprietary interest in any material or method mentioned.