A fluorene based copolymer was synthesized for electroluminescent application. To the main chain of polymer the nitrogen heterocyclic, 1H-pyrazolo[3,4-b]quinoxaline, unit was introduced. The incorporation of this derivative tuned the emission from the blue to yellow-green one. A simple, single layered device was fabricated with the configuration ITO/PEDOT/co-poly-FLU-PQX/Ca/Mg.
{"title":"Single-layer electroluminescent devices based on fluorene-1H-pyrazolo[3,4-b]quinoxaline co-polymers","authors":"M. Pokladko-Kowar, A. Danel, Ł. Chacaga","doi":"10.1117/12.2027574","DOIUrl":"https://doi.org/10.1117/12.2027574","url":null,"abstract":"A fluorene based copolymer was synthesized for electroluminescent application. To the main chain of polymer the nitrogen heterocyclic, 1H-pyrazolo[3,4-b]quinoxaline, unit was introduced. The incorporation of this derivative tuned the emission from the blue to yellow-green one. A simple, single layered device was fabricated with the configuration ITO/PEDOT/co-poly-FLU-PQX/Ca/Mg.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124412267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. Silva, A. Cabral, M. Abreu, J. Rebordão, D. Castro Alves
Heterodyne laser interferometry has proved to be a valuable technique for high accuracy optical displacement metrology. In many applications in science and engineering, it is required a highly accurate measurement of multiple degrees of freedom of a critical device with regard to a mechanical system reference. An example is the primary calibration of standard accelerometers by interferometry. In this context, it is proposed a multi-channel system based on a heterodyne interferometer for simultaneous measurement of piston and wobble of the accelerometer top surface. The implemented system is based on a Michelson interferometer, with four parallel beams of equal intensity that enable simultaneous measurement of different points of the surface. The parallel approach reduces the complexity due the simultaneous use of common units (laser source, modulators and some optics), maintaining the high resolution associated with interferometric sources. In this paper we present a new metrology concept based on heterodyne interferometry that can allow the simultaneous measurement of a surface piston and wobble movement, detailing the physical model of the sensor, the prototype implementation and the performance characterized by the test result. The future steps towards an implementation in a primary standard accelerometer calibration setup are also described.
{"title":"High accuracy piston and wobble sensor based on heterodyne interferometry","authors":"C. Silva, A. Cabral, M. Abreu, J. Rebordão, D. Castro Alves","doi":"10.1117/12.2026252","DOIUrl":"https://doi.org/10.1117/12.2026252","url":null,"abstract":"Heterodyne laser interferometry has proved to be a valuable technique for high accuracy optical displacement metrology. In many applications in science and engineering, it is required a highly accurate measurement of multiple degrees of freedom of a critical device with regard to a mechanical system reference. An example is the primary calibration of standard accelerometers by interferometry. In this context, it is proposed a multi-channel system based on a heterodyne interferometer for simultaneous measurement of piston and wobble of the accelerometer top surface. The implemented system is based on a Michelson interferometer, with four parallel beams of equal intensity that enable simultaneous measurement of different points of the surface. The parallel approach reduces the complexity due the simultaneous use of common units (laser source, modulators and some optics), maintaining the high resolution associated with interferometric sources. In this paper we present a new metrology concept based on heterodyne interferometry that can allow the simultaneous measurement of a surface piston and wobble movement, detailing the physical model of the sensor, the prototype implementation and the performance characterized by the test result. The future steps towards an implementation in a primary standard accelerometer calibration setup are also described.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125796231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. R. da Silveira, J. Costa, M. T. Giraldi, Marcos A. R. Franco, P. Jorge
This work presents numerical results related to an in-line Mach-Zehnder interferometer used as a refractive index sensor. The in-line Mach-Zehnder is based on abrupt tapers in standard single mode optical fiber. Numerical simulations were carried out using commercial software based on Beam Propagation Method in order to analyze the sensitivity response in terms of wavelength shift when this sensor is bent at certain radii of curvature. We realized that application of bending in the In-line Mach-Zehnder interferometer enhanced considerably the sensitivity of this sensor to the external refractive index. The best result was achieved for a radius of curvature of 10 mm (~500 nm/RIU for the refractive index range of 1.33 to 1.41) improving the sensitivity about eight times in comparison with the case with no bent.
本文介绍了一种用于折射率传感器的直线马赫-曾德尔干涉仪的数值结果。直列Mach-Zehnder是基于标准单模光纤中的突变锥的。利用基于光束传播法的商业软件进行数值模拟，分析该传感器在一定曲率半径下弯曲时的灵敏度响应与波长位移的关系。我们意识到弯曲在直线马赫-曾德尔干涉仪中的应用大大提高了该传感器对外部折射率的灵敏度。当曲率半径为10 mm (~500 nm/RIU，折射率范围为1.33 ~ 1.41)时，灵敏度比无弯曲时提高了约8倍。
{"title":"Enhancement of refractive index sensitivity of the in-line Mach-Zehnder interferometer through bending","authors":"C. R. da Silveira, J. Costa, M. T. Giraldi, Marcos A. R. Franco, P. Jorge","doi":"10.1117/12.2028226","DOIUrl":"https://doi.org/10.1117/12.2028226","url":null,"abstract":"This work presents numerical results related to an in-line Mach-Zehnder interferometer used as a refractive index sensor. The in-line Mach-Zehnder is based on abrupt tapers in standard single mode optical fiber. Numerical simulations were carried out using commercial software based on Beam Propagation Method in order to analyze the sensitivity response in terms of wavelength shift when this sensor is bent at certain radii of curvature. We realized that application of bending in the In-line Mach-Zehnder interferometer enhanced considerably the sensitivity of this sensor to the external refractive index. The best result was achieved for a radius of curvature of 10 mm (~500 nm/RIU for the refractive index range of 1.33 to 1.41) improving the sensitivity about eight times in comparison with the case with no bent.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124808871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
L. M. Guerrero, A. Plata G., Giovanna Rincón C., Henry Gutiérrez A., A. Plata
In the last twenty years the growth of bacterial colonies has been studied experimentally using images with different growth patterns, but the resolution of those images is in areas of tenths of microns without range information. On the other hand, theoretical studies considering the bacteria as systems with collective behavior controlled by a reduced number of parameters have been developed. The present work aims to study morphological and dynamic growth of Bacillus polymyxa colonies by the technique of digital image analysis in wide-field microscopy, which provides high resolution, both in texture and topography. Getting a three-dimensional behavior of dynamic biological systems is useful to create structures and materials with different physical and biological properties for industrial applications.
{"title":"Morphological analysis of Bacillux polymyxa colonies: digital image analysis in wide-field microscopy","authors":"L. M. Guerrero, A. Plata G., Giovanna Rincón C., Henry Gutiérrez A., A. Plata","doi":"10.1117/12.2027612","DOIUrl":"https://doi.org/10.1117/12.2027612","url":null,"abstract":"In the last twenty years the growth of bacterial colonies has been studied experimentally using images with different growth patterns, but the resolution of those images is in areas of tenths of microns without range information. On the other hand, theoretical studies considering the bacteria as systems with collective behavior controlled by a reduced number of parameters have been developed. The present work aims to study morphological and dynamic growth of Bacillus polymyxa colonies by the technique of digital image analysis in wide-field microscopy, which provides high resolution, both in texture and topography. Getting a three-dimensional behavior of dynamic biological systems is useful to create structures and materials with different physical and biological properties for industrial applications.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"8785 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129474738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ramachandra Raghavendra, K. Raja, Bian Yang, C. Busch
The advancement in face recognition algorithm has a strong relationship with the availability of face databases that exhibit varying factors reflecting real life scenarios. The GUCLF face database is the first of its kind that can strongly influence the advancement in face recognition technology. In this paper, we introduce and describe our new face samples database collected using Lytro light field camera. The database consists of 200 reference samples and 303 probe samples collected from 25 subjects. The reference samples are collected in the controlled conditions using Canon EOS 550D DSLR camera. While probe samples are captured using both conventional digital camera (Sony DSC-S750) and Lytro light field camera. The probe samples are captured in three different scenarios: indoor, corridor and outdoor to include all possible real life conditions. In addition to the database description, this paper also elaborates on possible uses of the collected database and proposes a testing protocol. Further, we also present the quantitative results from the baseline experiments using the Kernel Discriminant Analysis (KDA).
{"title":"GUCLF: a new light field face database","authors":"Ramachandra Raghavendra, K. Raja, Bian Yang, C. Busch","doi":"10.1117/12.2026184","DOIUrl":"https://doi.org/10.1117/12.2026184","url":null,"abstract":"The advancement in face recognition algorithm has a strong relationship with the availability of face databases that exhibit varying factors reflecting real life scenarios. The GUCLF face database is the first of its kind that can strongly influence the advancement in face recognition technology. In this paper, we introduce and describe our new face samples database collected using Lytro light field camera. The database consists of 200 reference samples and 303 probe samples collected from 25 subjects. The reference samples are collected in the controlled conditions using Canon EOS 550D DSLR camera. While probe samples are captured using both conventional digital camera (Sony DSC-S750) and Lytro light field camera. The probe samples are captured in three different scenarios: indoor, corridor and outdoor to include all possible real life conditions. In addition to the database description, this paper also elaborates on possible uses of the collected database and proposes a testing protocol. Further, we also present the quantitative results from the baseline experiments using the Kernel Discriminant Analysis (KDA).","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"8785 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128653153","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this work, a technique for measuring high frequency micro-vibrations by using non holographic fiber specklegram sensor is experimentally demonstrated. In our setup, a laser source emitting at 632nm is coupled to a structure of Singlemode-Multimode-Singlemode fibers which produce a filtering effect that is used as optical transducer. Mechanical perturbations of controlled amplitude and frequency are applied to the Multimode fiber, which is fastened at the ends to induce vibrations. Perturbations higher than 3 KHz and below one micron are perfectly recovered by the system, which additionally, exhibits a linear response. Due to the low cost and the simplicity of the technique, it becomes an interesting method for the implementation of fiber sensors in a wide range of engineering applications.
{"title":"Fiber specklegram sensors (FSS) for measuring high frequency mechanical perturbations","authors":"Alejandro Hoyos, N. D. Gómez, J. A. Gómez","doi":"10.1117/12.2026075","DOIUrl":"https://doi.org/10.1117/12.2026075","url":null,"abstract":"In this work, a technique for measuring high frequency micro-vibrations by using non holographic fiber specklegram sensor is experimentally demonstrated. In our setup, a laser source emitting at 632nm is coupled to a structure of Singlemode-Multimode-Singlemode fibers which produce a filtering effect that is used as optical transducer. Mechanical perturbations of controlled amplitude and frequency are applied to the Multimode fiber, which is fastened at the ends to induce vibrations. Perturbations higher than 3 KHz and below one micron are perfectly recovered by the system, which additionally, exhibits a linear response. Due to the low cost and the simplicity of the technique, it becomes an interesting method for the implementation of fiber sensors in a wide range of engineering applications.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128655102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
C. García-Resúa, Hugo Pena-Verdeal, M. Lira, M. Oliveira, M. .. Giraldez, E. Yebra-Pimentel
To measure different parameters of lower tear meniscus height (TMH) by using photography with open software of measurement. TMH was addressed from lower eyelid to the top of the meniscus (absolute TMH) and to the brightest meniscus reflex (reflex TMH). 121 young healthy subjects were included in the study. The lower tear meniscus was videotaped by a digital camera attached to a slit lamp. Three videos were recorded in central meniscus portion on three different methods: slit lamp without fluorescein instillation, slit lamp with fluorescein instillation and TearscopeTM without fluorescein instillation. Then, a masked observed obtained an image from each video and measured TMH by using open source software of measurement based on Java (NIH ImageJ). Absolute central (TMH-CA), absolute with fluorescein (TMH-F) and absolute using the Tearscope (TMH-Tc) were compared each other as well as reflex central (TMH-CR) and reflex Tearscope (TMH-TcR). Mean ± S.D. values of TMH-CA, TMH-CR, TMH-F, TMH-Tc and TMH-TcR of 0.209 ± 0.049, 0.139 ± 0.031, 0.222 ± 0.058, 0.175 ± 0.045 and 0.109 ± 0.029 mm, respectively were found. Paired t-test was performed for the relationship between TMH-CA – TMH-CR, TMH-CA – TMH-F, TMH-CA – TMH-Tc, TMH-F – TMH-Tc, TMH-Tc – TMH-TcR and TMH-CR – TMH-TcR. In all cases, it was found a significant difference between both variables (all p < 0.008). This study showed a useful tool to objectively measure TMH by photography. Eye care professionals should maintain the same TMH parameter in the follow-up visits, due to the difference between them.
{"title":"Comparison between three methods to value lower tear meniscus measured by image software","authors":"C. García-Resúa, Hugo Pena-Verdeal, M. Lira, M. Oliveira, M. .. Giraldez, E. Yebra-Pimentel","doi":"10.1117/12.2030433","DOIUrl":"https://doi.org/10.1117/12.2030433","url":null,"abstract":"To measure different parameters of lower tear meniscus height (TMH) by using photography with open software of measurement. TMH was addressed from lower eyelid to the top of the meniscus (absolute TMH) and to the brightest meniscus reflex (reflex TMH). 121 young healthy subjects were included in the study. The lower tear meniscus was videotaped by a digital camera attached to a slit lamp. Three videos were recorded in central meniscus portion on three different methods: slit lamp without fluorescein instillation, slit lamp with fluorescein instillation and TearscopeTM without fluorescein instillation. Then, a masked observed obtained an image from each video and measured TMH by using open source software of measurement based on Java (NIH ImageJ). Absolute central (TMH-CA), absolute with fluorescein (TMH-F) and absolute using the Tearscope (TMH-Tc) were compared each other as well as reflex central (TMH-CR) and reflex Tearscope (TMH-TcR). Mean ± S.D. values of TMH-CA, TMH-CR, TMH-F, TMH-Tc and TMH-TcR of 0.209 ± 0.049, 0.139 ± 0.031, 0.222 ± 0.058, 0.175 ± 0.045 and 0.109 ± 0.029 mm, respectively were found. Paired t-test was performed for the relationship between TMH-CA – TMH-CR, TMH-CA – TMH-F, TMH-CA – TMH-Tc, TMH-F – TMH-Tc, TMH-Tc – TMH-TcR and TMH-CR – TMH-TcR. In all cases, it was found a significant difference between both variables (all p < 0.008). This study showed a useful tool to objectively measure TMH by photography. Eye care professionals should maintain the same TMH parameter in the follow-up visits, due to the difference between them.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129968550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Among many applications quantum weak measurements have been shown to be important in exploring fundamental physics issues, such as the experimental violation of the Heisenberg uncertainty relation and the Hardy paradox, and have also technological implications in quantum optics, quantum metrology and quantum communications, where the precision of the measurement is as important as the precision of quantum state preparation. The theory of weak measurement can be formulated using the pre-and post-selected quantum systems, as well as using the weak measurement operator formalism. In this work, we study the quantum discord (QD) of quasi-Werner mixed states based on bipartite entangled coherent states using the weak measurements operator, instead of the projective measurement operators. We then compare the quantum discord for both kinds of measurement operators, in terms of the entanglement quality, the latter being measured using the concept of concurrence. It’s found greater quantum correlations using the weak measurement operators.
{"title":"Quantum discord with weak measurement operators of quasi-Werner states based on bipartite entangled coherent states","authors":"E. Castro, R. Gómez, C. Ladera, A. Zambrano","doi":"10.1117/12.2021625","DOIUrl":"https://doi.org/10.1117/12.2021625","url":null,"abstract":"Among many applications quantum weak measurements have been shown to be important in exploring fundamental physics issues, such as the experimental violation of the Heisenberg uncertainty relation and the Hardy paradox, and have also technological implications in quantum optics, quantum metrology and quantum communications, where the precision of the measurement is as important as the precision of quantum state preparation. The theory of weak measurement can be formulated using the pre-and post-selected quantum systems, as well as using the weak measurement operator formalism. In this work, we study the quantum discord (QD) of quasi-Werner mixed states based on bipartite entangled coherent states using the weak measurements operator, instead of the projective measurement operators. We then compare the quantum discord for both kinds of measurement operators, in terms of the entanglement quality, the latter being measured using the concept of concurrence. It’s found greater quantum correlations using the weak measurement operators.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"326 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131034828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Kelly Bravo, N. Falcón, Freddy J. Narea, Rafael A. Muñoz, Aaron A. Muñoz
The determination of the optical parameters are important for remote sensing and aircraft, in this case allow the difference between a cloud composed solely of water and water plus ash. Therefore, this research is intended to determine the optical properties of the ash four active volcanoes, by studying the spectral resolution reflectance interpreting the results in the approximation of Kubelka - Munk equation through the transfer equation radiative. The results allow classifying these ashes depending on their place of origin.
{"title":"Optical characterization of volcanic ash using diffuse reflection spectroscopy","authors":"D. Kelly Bravo, N. Falcón, Freddy J. Narea, Rafael A. Muñoz, Aaron A. Muñoz","doi":"10.1117/12.2026365","DOIUrl":"https://doi.org/10.1117/12.2026365","url":null,"abstract":"The determination of the optical parameters are important for remote sensing and aircraft, in this case allow the difference between a cloud composed solely of water and water plus ash. Therefore, this research is intended to determine the optical properties of the ash four active volcanoes, by studying the spectral resolution reflectance interpreting the results in the approximation of Kubelka - Munk equation through the transfer equation radiative. The results allow classifying these ashes depending on their place of origin.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126630128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The main goal of this study was to investigate the effect of accommodation on eye's optical quality. Wavefront aberrations data of 35 young emmetropic eyes were measured with the L80 Wave+: (1) ocular aberrations were measured with the wavefront sensor, while the subjects fixated at far and near (40 cm), (2) corneal wavefront aberrations were computed from the Placido disk system's data for distance vision conditions and (3) the internal wavefront component of the eye were determined as the difference between ocular and corneal wavefront aberrations. Ocular wavefront aberrations pattern changed with accommodation, particularly due to changes in the primary spherical aberrations towards negative values. Furthermore, the optical quality of the eye and the retinal image quality changes during near vision.
{"title":"Assessing the optical properties of the healthy and emmetropic eye with accommodation","authors":"C. Oliveira, S. Franco","doi":"10.1117/12.2028240","DOIUrl":"https://doi.org/10.1117/12.2028240","url":null,"abstract":"The main goal of this study was to investigate the effect of accommodation on eye's optical quality. Wavefront aberrations data of 35 young emmetropic eyes were measured with the L80 Wave+: (1) ocular aberrations were measured with the wavefront sensor, while the subjects fixated at far and near (40 cm), (2) corneal wavefront aberrations were computed from the Placido disk system's data for distance vision conditions and (3) the internal wavefront component of the eye were determined as the difference between ocular and corneal wavefront aberrations. Ocular wavefront aberrations pattern changed with accommodation, particularly due to changes in the primary spherical aberrations towards negative values. Furthermore, the optical quality of the eye and the retinal image quality changes during near vision.","PeriodicalId":135913,"journal":{"name":"Iberoamerican Meeting of Optics and the Latin American Meeting of Optics, Lasers and Their Applications","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126891443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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