Dr. Per G. Söderberg Profile

Dr. Per G. Söderberg

Professor of Opthalmology at Uppsala Univ.

SPIE Involvement:

Conference Program Committee | Author | Editor

Publications (47)

Proceedings Article | 4 March 2022 Poster + Presentation + Paper

Estimation of the cross-sectional surface area of the waist of the nerve fiber layer at the optic nerve head

Konstancija Kisonaite, Zhaohua Yu, Faisal Raeme, Simone Bendazzoli, Chunliang Wang, Per Söderberg

Proceedings Volume 11941, 119410F (2022) https://doi.org/10.1117/12.2608073

KEYWORDS: Nerve, Optic nerve, Head, Evolutionary algorithms, Retina, Optical coherence tomography, Axons, Artificial intelligence, Visualization, Image segmentation

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Proceedings Article | 5 March 2021 Presentation + Paper

Fully automatic estimation of the waist of the nerve fiber layer at the optic nerve head angularly resolved

Irene Brusini, Gabriel Carizzo, Simone Bendazzoli, Chunliang Wang, Zhaohua Yu, Camilla Sandberg Melin, Konstancija Kisonaite, Faisal Raeme, Per Söderberg

Proceedings Volume 11623, 116231D (2021) https://doi.org/10.1117/12.2583562

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The present project aims at developing a fully automatic software for estimation of the waist of the nerve fiber layer in the Optic Nerve Head (ONH) angularly resolved in the frontal plane as a tool for morphometric monitoring of glaucoma. The waist of the nerve fiber layer is here defined as Pigment epithelium central limit –Inner limit of the retina – Minimal Distance, (PIMD). 3D representations of the ONH were collected with high resolution OCT in young not glaucomatous eyes and glaucomatous eyes. An improved tool for manual annotation was developed in Python. This tool was found user friendly and to provide sufficiently precise manual annotation. PIMD was automatically estimated with a software consisting of one AI model for detection of the inner limit of the retina and another AI model for localization of the Optic nerve head Pigment epithelium Central limit (OPCL). In the current project, the AI model for OPCL localization was retrained with new data manually annotated with the improved tool for manual annotation both in not glaucomatous eyes and in glaucomatous eyes. Finally, automatic annotations were compared to 3 annotations made by 3 independent annotators in an independent subset of both the not glaucomatous and the glaucomatous eyes. It was found that the fully automatic estimation of PIMD-angle overlapped the 3 manual annotators with small variation among the manual annotators. Considering interobserver variation, the improved tool for manual annotation provided less variation than our original annotation tool in not glaucomatous eyes suggesting that variation in glaucomatous eyes is due to variable pathological anatomy, difficult to annotate without error. The small relative variation in relation to the substantial overall loss of PIMD in the glaucomatous eyes compared to the not glaucomatous eyes suggests that our software for fully automatic estimation of PIMD-angle can now be implemented clinically for monitoring of glaucoma progression.

Proceedings Article | 19 February 2020 Paper

Fully automatic estimation of the angular distribution of the waist of the nerve fiber layer in the optic nerve head

Gabriel Carrizo, Zhaohua Yu, Chunliang Wang, Camilla Sandberg Melin, Per Söderberg, Konstancia Kisonaite

Proceedings Volume 11218, 112180I (2020) https://doi.org/10.1117/12.2554445

KEYWORDS: Convolutional neural networks, Artificial neural networks, Machine learning, Ophthalmology, Image segmentation, Optical coherence tomography, Optic nerve, Retina, Neural networks, Eye

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Proceedings Article | 28 February 2019 Presentation + Paper

Optic nerve head morphometry for glaucoma diagnosis, optimization of clinical measurement strategy

Per Söderberg, Zhaohua Yu, Camilla Sandberg Melin

Proceedings Volume 10858, 108581C (2019) https://doi.org/10.1117/12.2516319

KEYWORDS: Tolerancing, Databases, Nerve, Optic nerve, Head, Visualization, Calibration, Axons

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Proceedings Article | 8 March 2018 Presentation + Paper

Angular distribution of Pigment epithelium central limit-Inner limit of the retina Minimal Distance (PIMD), in the young not pathological optic nerve head imaged by OCT

Per Söderberg, Camilla Sandberg-Melin

Proceedings Volume 10474, 1047413 (2018) https://doi.org/10.1117/12.2299723

KEYWORDS: Eye, Optical coherence tomography, Head, Retina, Optic nerve, Nerve, Raster graphics, Calibration, Algorithm development, Image segmentation

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Proceedings Article | 10 February 2017 Presentation + Paper

Further analysis of clinical feasibility of OCT-based glaucoma diagnosis with Pigment epithelium central limit- Inner limit of the retina Minimal Distance (PIMD)

Per Söderberg, Filip Malmberg, Camilla Sandberg-Melin

Proceedings Volume 10045, 100450R (2017) https://doi.org/10.1117/12.2260139

KEYWORDS: Optical coherence tomography, Retina, Visualization, Image segmentation, Nerve, Clocks, Raster graphics, Eye, Calibration, Distance measurement

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The present study aimed to elucidate if comparison of angular segments of Pigment epithelium central limit- Inner limit of the retina Minimal Distance, measured over 2π radians in the frontal plane (PIMD-2π) between visits of a patient, renders sufficient precision for detection of loss of nerve fibers in the optic nerve head. An optic nerve head raster scanned cube was captured with a TOPCON 3D OCT 2000 (Topcon, Japan) device in one early to moderate stage glaucoma eye of each of 13 patients. All eyes were recorded at two visits less than 1 month apart. At each visit, 3 volumes were captured. Each volume was extracted from the OCT device for analysis. Then, angular PIMD was segmented three times over 2π radians in the frontal plane, resolved with a semi-automatic algorithm in 500 equally separated steps, PIMD-2π. It was found that individual segmentations within volumes, within visits, within subjects can be phase adjusted to each other in the frontal plane using cross-correlation. Cross correlation was also used to phase adjust volumes within visits within subjects and visits to each other within subjects. Then, PIMD-2π for each subject was split into 250 bundles of 2 adjacent PIMDs. Finally, the sources of variation for estimates of segments of PIMD-2π were derived with analysis of variance assuming a mixed model. The variation among adjacent PIMDS was found very small in relation to the variation among segmentations. The variation among visits was found insignificant in relation to the variation among volumes and the variance for segmentations was found to be on the order of 20 % of that for volumes. The estimated variances imply that, if 3 segmentations are averaged within a volume and at least 10 volumes are averaged within a visit, it is possible to estimate around a 10 % reduction of a PIMD-2π segment from baseline to a subsequent visit as significant. Considering a loss rate for a PIMD-2π segment of 23 μm/yr., 4 visits per year, and averaging 3 segmentations per volume and 3 volumes per visit, a significant reduction from baseline can be detected with a power of 80 % in about 18 months. At higher loss rate for a PIMD-2π segment, a significant difference from baseline can be detected earlier. Averaging over more volumes per visit considerably decreases the time for detection of a significant reduction of a segment of PIMD-2π. Increasing the number of segmentations averaged per visit only slightly reduces the time for detection of a significant reduction. It is concluded that phase adjustment in the frontal plane with cross correlation allows high precision estimates of a segment of PIMD-2π that imply substantially shorter followup time for detection of a significant change than mean deviation (MD) in a visual field estimated with the Humphrey perimeter or neural rim area (NRA) estimated with the Heidelberg retinal tomograph.

SPIE Journal Paper | 31 January 2017 Open Access

Measuring temperature in the lens during experimental heat load indirectly as light scattering increase rate

Zhaohua Yu, Nooshin Talebizadeh, Martin Kronschläger, Per Söderberg

JBO, Vol. 22, Issue 01, 015005, (January 2017) https://doi.org/10.1117/12.10.1117/1.JBO.22.1.015005

KEYWORDS: Light scattering, Temperature metrology, Statistical analysis, In vivo imaging, Proteins, Optical testing, Scatter measurement, Calibration, Infrared radiation, Photodiodes

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Proceedings Article | 4 March 2016 Presentation + Paper

Analysis of the variation in OCT measurements of a structural bottle neck for eye-brain transfer of visual information from 3D-volumes of the optic nerve head, PIMD-Average [0;2]

Per Söderberg, Filip Malmberg, Camilla Sandberg-Melin

Proceedings Volume 9693, 96930O (2016) https://doi.org/10.1117/12.2218208

KEYWORDS: Optical coherence tomography, Optic nerve, Head, 3D modeling, Information visualization, 3D metrology, Neck, Visual analytics, Visualization, Precision measurement, Eye, Retina, Nerve, Optical fibers

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The present study aimed to analyze the clinical usefulness of the thinnest cross section of the nerve fibers in the optic nerve head averaged over the circumference of the optic nerve head. 3D volumes of the optic nerve head of the same eye was captured at two different visits spaced in time by 1-4 weeks, in 13 subjects diagnosed with early to moderate glaucoma. At each visit 3 volumes containing the optic nerve head were captured independently with a Topcon OCT- 2000 system. In each volume, the average shortest distance between the inner surface of the retina and the central limit of the pigment epithelium around the optic nerve head circumference, PIMD-Average [0;2π], was determined semiautomatically. The measurements were analyzed with an analysis of variance for estimation of the variance components for subjects, visits, volumes and semi-automatic measurements of PIMD-Average [0;2π]. It was found that the variance for subjects was on the order of five times the variance for visits, and the variance for visits was on the order of 5 times higher than the variance for volumes. The variance for semi-automatic measurements of PIMD-Average [0;2π] was 3 orders of magnitude lower than the variance for volumes. A 95 % confidence interval for mean PIMD-Average [0;2π] was estimated to 1.00 ±0.13 mm (D.f. = 12). The variance estimates indicate that PIMD-Average [0;2π] is not suitable for comparison between a onetime estimate in a subject and a population reference interval. Cross-sectional independent group comparisons of PIMD-Average [0;2π] averaged over subjects will require inconveniently large sample sizes. However, cross-sectional independent group comparison of averages of within subject difference between baseline and follow-up can be made with reasonable sample sizes. Assuming a loss rate of 0.1 PIMD-Average [0;2π] per year and 4 visits per year it was found that approximately 18 months follow up is required before a significant change of PIMDAverage [0;2π] can be observed with a power of 0.8. This is shorter than what has been observed both for HRT measurements and automated perimetry measurements with a similar observation rate. It is concluded that PIMDAverage [0;2π] has the potential to detect deterioration of glaucoma quicker than currently available primary diagnostic instruments. To increase the efficiency of PIMD-Average [0;2π] further, the variation among visits within subject has to be reduced.

Proceedings Article | 4 March 2016 Presentation + Paper

Estimating a structural bottle neck for eye-brain transfer of visual information from 3D-volumes of the optic nerve head from a commercial OCT device

Filip Malmberg, Camilla Sandberg-Melin, Per Söderberg

Proceedings Volume 9693, 96930N (2016) https://doi.org/10.1117/12.2218337

KEYWORDS: Optical coherence tomography, Optic nerve, Head, Retina, 3D image processing, Image filtering, Information visualization, MATLAB, Neck, Visualization, Distance measurement, Electroluminescent displays, Nerve

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Proceedings Article | 20 March 2015 Paper

Near infrared radiation damage mechanism in the lens

Per Söderberg, Nooshin Talebizadeh, Konstantin Galichanin, Martin Kronschläger, Karl Schulmeister, Zhaohua Yu

Proceedings Volume 9307, 930717 (2015) https://doi.org/10.1117/12.2086661

KEYWORDS: Light scattering, In vivo imaging, Eye, Near infrared, Temperature metrology, Absorption, Iris, Fiber lasers, Collimation, Tissues

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SPIE Journal Paper | 20 January 2015 Open Access

Temperature-controlled in vivo ocular exposure to 1090-nm radiation suggests that near-infrared radiation cataract is thermally induced

Zhaohua Yu, Karl Schulmeister, Nooshin Talebizadeh, Martin Kronschläger, Per Söderberg

JBO, Vol. 20, Issue 01, 015003, (January 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.1.015003

KEYWORDS: Eye, Temperature metrology, In vivo imaging, Light scattering, Cornea, Lenses, Scatter measurement, Eye models, Infrared radiation, Data modeling

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SPIE Journal Paper | 16 October 2014 Open Access

Ocular temperature elevation induced by threshold in vivo exposure to 1090-nm infrared radiation and associated heat diffusion

Zhaohua Yu, Karl Schulmeister, Nooshin Talebizadeh, Martin Kronschläger, Per Söderberg

JBO, Vol. 19, Issue 10, 105008, (October 2014) https://doi.org/10.1117/12.10.1117/1.JBO.19.10.105008

KEYWORDS: Temperature metrology, Eye, Sclera, Optic nerve, In vivo imaging, Light scattering, Retina, Infrared radiation, Cornea, Sensors

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Proceedings Article | 28 February 2014 Paper

The Uppsala Contrast Sensitivity Test (UCST): A fast strategy for clinical assessment of contrast sensitivity

Lars Malmqvist, Per Söderberg

Proceedings Volume 8930, 89300H (2014) https://doi.org/10.1117/12.2054403

KEYWORDS: Contrast sensitivity, Spatial frequencies, Calibration, Eye, Visualization, Statistical analysis, Manufacturing, Optical transfer functions, Visual system, Glasses

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Proceedings Article | 15 October 2013 Paper

Laser dazzling impacts on car driver performance

Ove Steinvall, Stig Sandberg, Ulf Hörberg, Rolf Persson, Folke Berglund, Kjell Karslsson, Johan Öhgren, Zhaohua Yu, Per Söderberg

Proceedings Volume 8898, 88980H (2013) https://doi.org/10.1117/12.2028505

KEYWORDS: Visualization, Cones, Sensors, Eye, Roads, Headlamps, Laser countermeasures, Visual system, Laser development, Defense and security

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Proceedings Article | 10 March 2011 Paper

VR-simulation cataract surgery in non-experienced trainees: evolution of surgical skill

Per Söderberg, Markus Erngrund, Eva Skarman, Leif Nordh, Carl-Gustaf Laurell

Proceedings Volume 7885, 78850L (2011) https://doi.org/10.1117/12.881527

KEYWORDS: Surgery, Computer simulations, Virtual reality, Human-machine interfaces, Ophthalmology, Eye, Device simulation, Ultrasonography, Computing systems, Lead

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Proceedings Article | 3 March 2010 Paper

Fully automated corneal endothelial morphometry of images captured by clinical specular microscopy

Curry Bucht, Per Söderberg, Göran Manneberg

Proceedings Volume 7550, 75501E (2010) https://doi.org/10.1117/12.849255

KEYWORDS: Cornea, Microscopy, Fourier transforms, Error analysis, Image enhancement, Statistical analysis, Microscopes, Software development, MATLAB, Image analysis

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The corneal endothelium serves as the posterior barrier of the cornea. Factors such as clarity and refractive properties of the cornea are in direct relationship to the quality of the endothelium. The endothelial cell density is considered the most important morphological factor of the corneal endothelium. Pathological conditions and physical trauma may threaten the endothelial cell density to such an extent that the optical property of the cornea and thus clear eyesight is threatened. Diagnosis of the corneal endothelium through morphometry is an important part of several clinical applications. Morphometry of the corneal endothelium is presently carried out by semi automated analysis of pictures captured by a Clinical Specular Microscope (CSM). Because of the occasional need of operator involvement, this process can be tedious, having a negative impact on sampling size. This study was dedicated to the development and use of fully automated analysis of a very large range of images of the corneal endothelium, captured by CSM, using Fourier analysis. Software was developed in the mathematical programming language Matlab. Pictures of the corneal endothelium, captured by CSM, were read into the analysis software. The software automatically performed digital enhancement of the images, normalizing lights and contrasts. The digitally enhanced images of the corneal endothelium were Fourier transformed, using the fast Fourier transform (FFT) and stored as new images. Tools were developed and applied for identification and analysis of relevant characteristics of the Fourier transformed images. The data obtained from each Fourier transformed image was used to calculate the mean cell density of its corresponding corneal endothelium. The calculation was based on well known diffraction theory. Results in form of estimated cell density of the corneal endothelium were obtained, using fully automated analysis software on 292 images captured by CSM. The cell density obtained by the fully automated analysis was compared to the cell density obtained from classical, semi-automated analysis and a relatively large correlation was found.

Proceedings Article | 23 February 2009 Paper

Photochemical effects in the lens from near infrared radiation?

Per Söderberg, Riyadh Al-Saqry, Karl Schulmeister, Konstantin Gallichanin, Martin Kronschläger, Zhaohua Yu

Proceedings Volume 7163, 716311 (2009) https://doi.org/10.1117/12.816848

KEYWORDS: Light scattering, In vivo imaging, Near infrared, Eye, Crystals, Cornea, Thermal effects, Retina, Optical testing, Continuous wave operation

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Proceedings Article | 18 February 2009 Paper

Fully automated corneal endothelial morphometry of images captured by clinical specular microscopy

Curry Bucht, Per Söderberg, Göran Manneberg

Proceedings Volume 7163, 716315 (2009) https://doi.org/10.1117/12.816850

KEYWORDS: Fourier transforms, Cornea, Image analysis, Image filtering, Binary data, Microscopy, Image enhancement, Error analysis, Bandpass filters, Algorithm development

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Proceedings Article | 25 February 2008 Paper

Measuring performance in virtual reality phacoemulsification surgery

Per Söderberg, Carl-Gustaf Laurell, Wamidh Simawi, Eva Skarman, Leif Nordh, Per Nordqvist

Proceedings Volume 6844, 684412 (2008) https://doi.org/10.1117/12.779572

KEYWORDS: Surgery, Virtual reality, Microscopes, Computer simulations, Computing systems, Iris, Ultrasonography, Human-machine interfaces, Eye, Laparoscopy

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Proceedings Article | 25 February 2008 Paper

The impact of horizontal offset of the cornea during corneal specular microscopy

Curry Bucht, Per Söderberg, Göran Manneberg

Proceedings Volume 6844, 684413 (2008) https://doi.org/10.1117/12.779573

KEYWORDS: Cornea, Polymethylmethacrylate, Image analysis, Error analysis, Refractive index, Microscopy, Fourier transforms, Microscopes, In vivo imaging, Eye

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Proceedings Article | 26 March 2007 Paper

Performance index for virtual reality phacoemulsification surgery

Per Söderberg, Carl-Gustaf Laurell, Wamidh Simawi, Eva Skarman, Per Nordqvist, Leif Nordh

Proceedings Volume 6426, 64261B (2007) https://doi.org/10.1117/12.717477

KEYWORDS: Surgery, Virtual reality, Computer simulations, Eye, Computing systems, Human-machine interfaces, Video, Visualization, Ultrasonography, Microscopes

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Proceedings Article | 5 March 2007 Paper

Recording the diffraction pattern reflected from corneal endothelium

Curry Bucht, Per Söderberg, Göran Manneberg

Proceedings Volume 6426, 642610 (2007) https://doi.org/10.1117/12.717478

KEYWORDS: Diffraction, Cornea, Diffraction gratings, Reflection, Far-field diffraction, Collimation, Lenses, Beam splitters, Helium neon lasers, Interfaces

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Proceedings Article | 7 March 2006 Paper

A model for corneal endothelial morphometry by diffraction

Curry Bucht, Per Söderberg, Göran Manneberg

Proceedings Volume 6138, 61380O (2006) https://doi.org/10.1117/12.660023

KEYWORDS: Diffraction, Modulation, Mathematical modeling, Fourier transforms, Cornea, Computer programming languages, Computer programming, MATLAB, Computer simulations, Eye

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Proceedings Article | 7 March 2006 Paper

Evaluation of response variables in computer-simulated virtual cataract surgery

Per Söderberg, Carl-Gustaf Laurell, Wamidh Simawi, Per Nordqvist, Eva Skarman, Leif Nordh

Proceedings Volume 6138, 61381B (2006) https://doi.org/10.1117/12.663541

KEYWORDS: Surgery, Statistical analysis, Virtual reality, Computer simulations, Phase measurement, Computing systems, Human-machine interfaces, Statistical inference, Eye, Physiology

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Proceedings Article | 18 April 2005 Paper

Virtual reality phacoemulsification: a comparison between skilled surgeons and students naive to cataract surgery

Per Söderberg, Carl-Gustaf Laurell, W. Simawi, P. Nordqvist, Eva Skarman, Leif Nordh

Proceedings Volume 5688, (2005) https://doi.org/10.1117/12.598055

KEYWORDS: Surgery, Virtual reality, Computer simulations, Eye, Computing systems, Video, Iris, Cornea, Crystals, Liquid crystals

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Proceedings Article | 13 July 2004 Paper

Macular protection with IOLs

Per Soderberg, Stefan Lofgren, Marcelo Ayala, Xiuqin Dong, Manoj Kakar, Vino Mody, Linda Meyer, Carl-Gustaf Laurell

Proceedings Volume 5314, (2004) https://doi.org/10.1117/12.540882

KEYWORDS: Eye, Color vision, Lenses, Retina, Visualization, Transmittance, Visible radiation, Eyeglasses, Biomedical engineering, Sun

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Proceedings Article | 14 July 2003 Paper

Corneal ablation rate at 266 nm

Per Soderberg, Fabrice Manns, Stephen Sulhorn, Nelson Salas, Peggy Lamar, Jean-Marie Parel

Proceedings Volume 4951, (2003) https://doi.org/10.1117/12.482465

KEYWORDS: Cornea, Laser ablation, Scanning electron microscopy, Eye, Microscopes, Solid state lasers, Tissues, Vitreous, Clocks, Calibration

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Proceedings Article | 14 July 2003 Paper

Virtual cataract surgery: clinical evaluation

Per Soderberg, Carl-Gustaf Laurell, Per Nordqvist, Eva Skarman, Leif Nordh

Proceedings Volume 4951, (2003) https://doi.org/10.1117/12.482464

KEYWORDS: Surgery, Human-machine interfaces, Computer simulations, Microscopes, Eye, Computing systems, Visualization, Crystals, Liquid crystals, Virtual reality

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Proceedings Article | 13 June 2002 Paper

Thermoelectrically controlled device for studies of temperature-induced corneal shrinkage

David Borja, Fabrice Manns, Viviana Fernandez, Peggy Lamar, Per Soederberg, Jean-Marie Parel

Proceedings Volume 4611, (2002) https://doi.org/10.1117/12.470583

KEYWORDS: Tissues, Cornea, Sensors, Temperature metrology, Calibration, Thermoelectric materials, Copper, Eye, Computing systems, Data acquisition

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Proceedings Article | 13 June 2002 Paper

Computer-simulated phacoemulsification improvements

Per Soederberg, Carl-Gustaf Laurell, D. Artzen, Leif Nordh, Eva Skarman, P. Nordqvist, Mats Andersson

Proceedings Volume 4611, (2002) https://doi.org/10.1117/12.470578

KEYWORDS: Surgery, Computer simulations, Visualization, Algorithm development, Human-machine interfaces, Microscopes, Liquid crystals, 3D modeling, Zoom lenses, Transducers

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Proceedings Article | 7 June 2001 Paper

Maximum tolerable dose (MTD): a new index for ultraviolet radiation toxicity in the lens

Per Soderberg, Stefan Lofgren, Marcelo Ayala, M. Kakar

Proceedings Volume 4245, (2001) https://doi.org/10.1117/12.429275

KEYWORDS: Light scattering, Toxicity, Ultraviolet radiation, Binary data, Eye, Optical testing, Scatter measurement, Statistical analysis, Mercury, Safety

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Proceedings Article | 7 June 2000 Paper

Angular dependence of the intensity of backscattered light from human lenses with nuclear cataract: implications for measurement

Per Soederberg, Wen Qian, Enping Chen

Proceedings Volume 3908, (2000) https://doi.org/10.1117/12.387508

KEYWORDS: Light scattering, Scattering, Eye, Lenses, Scatter measurement, Digital recording, Lamps, Microscopy, Cameras, Image analysis

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Proceedings Article | 18 June 1999 Paper

The optimum sunglass filter?

Per Soederberg, Ralph Michael, Marcelo Ayala, Jiangmei Wu, Stefan Loefgren, John Merriam, Enping Chen

Proceedings Volume 3591, (1999) https://doi.org/10.1117/12.350616

KEYWORDS: Sun, Eye, Transmittance, Optical filters, Ultraviolet radiation, Standards development, Glasses, Electronic filtering, Lenses, Light

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Proceedings Article | 1 June 1998 Paper

New method for measurement of in-vivo penetration of UVR into the crystalline lens

Per Soederberg, Stefan Loefgren, Ralph Michael, Xochitl Gonzales-Cirre

Proceedings Volume 3246, (1998) https://doi.org/10.1117/12.309434

KEYWORDS: In vivo imaging, Transmittance, Crystals, Eye, Tissues, Ultraviolet radiation, Cornea, Absorption, Absorbance, Chromophores

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Proceedings Article | 26 May 1997 Paper

External standard for measurements with the Scheimpflug slitlamp microscope

Per Soederberg, Wen Qian, Enping Chen, Mats Johansson

Proceedings Volume 2971, (1997) https://doi.org/10.1117/12.275103

KEYWORDS: Eye, Calibration, Microscopes, Scattering, Photography, Standards development, Particles, Light scattering, Latex, Microscopy

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Proceedings Article | 17 May 1996 Paper

Transmittance of the lens capsule

Per Soederberg, Pascal Rol, David Denham, Jean-Marie Parel

Proceedings Volume 2673, (1996) https://doi.org/10.1117/12.240075

KEYWORDS: Transmittance, Cornea, Light scattering, Rayleigh scattering, Scattering, Eye, In vitro testing, Ultraviolet radiation, Absorption, Absorption filters

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Proceedings Article | 17 May 1996 Paper

Temperature-induced corneal shrinkage

Justin Chang, Per Soederberg, David Denham, Izuru Nose, William Lee, Jean-Marie Parel

Proceedings Volume 2673, (1996) https://doi.org/10.1117/12.240050

KEYWORDS: Cornea, Temperature metrology, Collagen, Calibration, Eye, Electronics, Scanning electron microscopy, Tissues, Data acquisition, Sensors

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Proceedings Article | 17 May 1996 Paper

Evaluation of the smoothness and accuracy of scanning photorefractive keratectomy on PMMA by optical profilometry

Fabrice Manns, Pascal Rol, Jean-Marie Parel, Armin Schmid, Jin-Hui Shen, Takaaki Matsui, Per Soederberg

Proceedings Volume 2673, (1996) https://doi.org/10.1117/12.240048

KEYWORDS: Laser ablation, Polymethylmethacrylate, Cornea, Prototyping, Profilometers, Pulsed laser operation, Nd:YAG lasers, Optical testing, Ophthalmology, Laser vision correction

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Proceedings Article | 22 May 1995 Paper

Calculation of laser pulse distribution maps for corneal reshaping with a scanning beam

Fabrice Manns, Jin-Hui Shen, Per Soederberg, Takaaki Matsui, Jean-Marie Parel

Proceedings Volume 2393, (1995) https://doi.org/10.1117/12.209849

KEYWORDS: Monochromatic aberrations, Cornea, Laser vision correction, Pulsed laser operation, Laser ablation, Surgery, Optical simulations, Systems modeling, Laser therapeutics, Tissues

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Proceedings Article | 22 May 1995 Paper

Three month follow-up of changes in the rabbit cornea after photoablation with a pulsed scanning beam at 213 nm

Per Soederberg, Takaaki Matsui, Fabrice Manns, Jin-Hui Shen, Jean-Marie Parel, Jean-Marc Legeais, Michele Savoldelli, Isabelle Drubaix, Maurice Menashe, Gilles Renard, Yves Pouliquen

Proceedings Volume 2393, (1995) https://doi.org/10.1117/12.209869

KEYWORDS: Cornea, Eye, Laser ablation, Lamps, Clinical trials, In vivo imaging, Computing systems, Camera shutters, Ophthalmology, Excimer lasers

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Proceedings Article | 22 May 1995 Paper

Corneal wound healing after photoablation with a 213-nm scanning solid state laser: histological and ultrastructural study

Jean-Marc Legeais, Jean-Marie Parel, Michele Savoldelli, Isabelle Drubaix, Per Soederberg, Fabrice Manns, Gilles Renard, Yves Pouliquen

Proceedings Volume 2393, (1995) https://doi.org/10.1117/12.209857

KEYWORDS: Laser ablation, Wound healing, Cornea, Tissues, Nd:YAG lasers, Natural surfaces, Solid state lasers, Excimer lasers, Nitrogen, Control systems

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Proceedings Article | 12 January 1995 Paper

Corneal photoablation with a scanning beam of 213 nm radiation for alteration of refraction: a three-month follow up study of the rabbit

Per Soederberg, Takaaki Matsui, Fabrice Manns, Jin-Hui Shen, Jean-Marie Parel, Jean-Marc Legeais, Michele Savoldelli, Isabelle Drubaix

Proceedings Volume 2330, (1995) https://doi.org/10.1117/12.199262

KEYWORDS: Cornea, Laser ablation, Eye, Refraction, Pulsed laser operation, Lamps, Laser vision correction, Air contamination, Ophthalmology, Nd:YAG lasers

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Proceedings Article | 12 January 1995 Paper

Model for photorefractive keratectomy with a scanning beam

Fabrice Manns, Jin-Hui Shen, Per Soederberg, Takaaki Matsui, Jean-Marie Parel

Proceedings Volume 2330, (1995) https://doi.org/10.1117/12.199254

KEYWORDS: Surgery, Laser ablation, Cornea, Tissues, Laser vision correction, Laser therapeutics, Ophthalmology, Computer simulations, Optical simulations, Laser tissue interaction

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Proceedings Article | 12 January 1995 Paper

Ablation rate of the human cornea and PMMA with fifth harmonic generation of Nd:YAG laser (213 nm)

Jin-Hui Shen, Fabrice Manns, Karen Joos, William Lee, David Denham, Per Soederberg, Jean-Marie Parel

Proceedings Volume 2330, (1995) https://doi.org/10.1117/12.199263

KEYWORDS: Laser ablation, Cornea, Polymethylmethacrylate, Nd:YAG lasers, Harmonic generation, Eye, Tissues, Laser optics, Ophthalmology, Refraction

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Proceedings Article | 21 July 1994 Paper

Ultraviolet radiation cataract: dose dependence

Per Soederberg, Stefan Loefgren

Proceedings Volume 2134, (1994) https://doi.org/10.1117/12.180821

KEYWORDS: Light scattering, Ultraviolet radiation, Data modeling, Safety, In vivo imaging, Eye, Lenses

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Proceedings Article | 23 June 1994 Paper

Fiber optic point-source for in-vivo measurement of light transmission and scattering in the eye

Per Soederberg, Per-Arne Torstensson, Claes Beckman, Jianming Ren, Peep Algvere, Bjorn Tengroth

Proceedings Volume 2126, (1994) https://doi.org/10.1117/12.178568

KEYWORDS: Eye, Light scattering, Fiber optics, Scattering, Optical testing, Integrating spheres, Fiber optics tests, In vivo imaging, Optical fibers, Prisms

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Proceedings Article | 1 March 1992 Paper

Basic considerations on laser radiation/eye interaction

Per Soederberg

Proceedings Volume 1524, (1992) https://doi.org/10.1117/12.57716

Showing 5 of 47 publications

Proceedings Volume Editor (20)

SPIE Conference Volume | 9 March 2020

Ophthalmic Technologies XXX

SPIE Conference Volume | 7 June 2019

Ophthalmic Technologies XXIX

SPIE Conference Volume | 11 April 2018

Ophthalmic Technologies XXVIII

SPIE Conference Volume | 21 March 2017

Ophthalmic Technologies XXVII

SPIE Conference Volume | 2 May 2016

Ophthalmic Technologies XXVI

Showing 5 of 20 publications

Conference Committee Involvement (26)

Ophthalmic Technologies XXXV

25 January 2025 | San Francisco, California, United States

Ophthalmic Technologies XXXIV

27 January 2024 | San Francisco, California, United States

Ophthalmic Technologies XXXIII

28 January 2023 | San Francisco, California, United States

Ophthalmic Technologies XXXII

22 January 2022 | San Francisco, California, United States

Ophthalmic Technologies XXXI

6 March 2021 | Online Only, California, United States

Ophthalmic Technologies XXX

1 February 2020 | San Francisco, California, United States

Ophthalmic Technologies XXIX

2 February 2019 | San Francisco, California, United States

Ophthalmic Technologies XXVIII

27 January 2018 | San Francisco, California, United States

Ophthalmic Technologies XXVII

28 January 2017 | San Francisco, California, United States

Ophthalmic Technologies XXVI

13 February 2016 | San Francisco, California, United States

Ophthalmic Technologies XXV

7 February 2015 | San Francisco, California, United States

Ophthalmic Technologies XXIV

1 February 2014 | San Francisco, California, United States

Ophthalmic Technologies XXIII

2 February 2013 | San Francisco, California, United States

Ophthalmic Technologies XXII

21 January 2012 | San Francisco, California, United States

Ophthalmic Technologies XXI

22 January 2011 | San Francisco, California, United States

Ophthalmic Technologies XX

23 January 2010 | San Francisco, California, United States

Ophthalmic Technologies XIX

24 January 2009 | San Jose, California, United States

Ophthalmic Technologies XVIII

19 January 2008 | San Jose, California, United States

Ophthalmic Technologies XVII

20 January 2007 | San Jose, California, United States

Ophthalmic Technologies XVI

21 January 2006 | San Jose, California, United States

Medical Imaging

1 September 2005 | Warsaw, Poland

Ophthalmic Technologies XV

22 January 2005 | San Jose, CA, United States

Ophthalmic Technologies XIV

24 January 2004 | San Jose, CA, United States

Ophthalmic Technologies XIII

25 January 2003 | San Jose, CA, United States

Ophthalmic Technologies XII

19 January 2002 | San Jose, CA, United States

Ophthalmic Technologies XI

20 January 2001 | San Jose, CA, United States

Showing 5 of 26 Conference Committees

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