Dr. Sandra M. Franco Profile

Dr. Sandra M. Franco

at Univ of Minho

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Author

Publications (10)

Proceedings Article | 7 December 2021 Paper

Crystalline lens curvature and thickness obtained with a slit-scanning system: preliminary results

Jessica Gomes, Sandra Franco

Proceedings Volume 11919, 119191I (2021) https://doi.org/10.1117/12.2614868

KEYWORDS: Crystals, Eye, Physics, Image processing, Image acquisition, Edge detection, Cornea, 3D image processing

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Proceedings Article | 3 October 2019 Paper

Compensation effect between corneal and internal ocular aberrations during a computer task

Jessica Gomes, Andreia Gonçalves, Sandra Franco

Proceedings Volume 11207, 112071M (2019) https://doi.org/10.1117/12.2527409

KEYWORDS: Monochromatic aberrations, Eye, Cornea, Image quality, Wavefront aberrations

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Proceedings Article | 3 October 2019 Paper

The influence of coloured lighting on ocular amplitude of accommodation

Sandra Franco, Raquel Moreira, João Linhares

Proceedings Volume 11207, 112071L (2019) https://doi.org/10.1117/12.2527402

KEYWORDS: Light sources and illumination, Light emitting diodes, Visualization, Eye, Light sources, LED lighting, Lamps, Ultraviolet radiation, Modulation transfer functions, Tungsten

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Proceedings Article | 22 August 2017 Paper

Assessing the wavefront aberrations of the emmetropic eye after a reading task

Sandra Franco, Cristina Oliveira

Proceedings Volume 10453, 104532D (2017) https://doi.org/10.1117/12.2276055

KEYWORDS: Wavefront aberrations, Eye, Image quality, Wavefront sensors, Wavefronts, Cornea

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Proceedings Article | 18 November 2013 Paper

Assessing the optical properties of the healthy and emmetropic eye with accommodation

C. Oliveira, Sandra Franco

Proceedings Volume 8785, 8785ER (2013) https://doi.org/10.1117/12.2028240

KEYWORDS: Eye, Wavefront aberrations, Image quality, Monochromatic aberrations, Wavefronts, Crystals, Optical properties, Spherical lenses, Modulation transfer functions, Statistical analysis

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Proceedings Article | 26 July 2011 Paper

Accommodative and convergence response to computer screen and printed text

Andreia Ferreira, Madalena Lira, Sandra Franco

Proceedings Volume 8001, 800139 (2011) https://doi.org/10.1117/12.892067

KEYWORDS: LCDs, CRTs, Visualization, Machine vision, Computer vision technology, Eye, Neodymium, Spherical lenses, Contact lenses, Visual system

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The aim of this work was to find out if differences exist in accommodative and convergence response for different computer monitors' and a printed text. It was also tried to relate the horizontal heterophoria value and accommodative response with the symptoms associated with computer use. Two independents experiments were carried out in this study. The first experiment was measuring the accommodative response on 89 subjects using the Grand Seiko WAM-5500 (Grand Seiko Co., Ltd., Japan). The accommodative response was measured using three computer monitors: a 17-inch cathode ray tube (CRT), two liquid crystal displays LCDs, one 17-inch (LCD17) and one 15 inches (LCD15) and a printed text. The text displayed was always the same for all the subjects and tests. A second experiment aimed to measure the value of habitual horizontal heterophoria on 80 subjects using the Von Graefe technique. The measurements were obtained using the same target presented on two different computer monitors, one 19-inch cathode ray tube (CRT) and other 19 inches liquid crystal displays (LCD) and printed on paper. A small survey about the incidence and prevalence of symptoms was performed similarly in both experiments. In the first experiment, the accommodation response was higher in the CRT and LCD's than for paper. There were not found significantly different response for both LCD monitors'. The second experiment showed that, the heterophoria values were similar for all the stimuli. On average, participants presented a small exophoria. In both experiments, asthenopia was the symptom that presented higher incidence. There are different accommodative responses when reading on paper or on computer monitors. This difference is more significant for CRT monitors. On the other hand, there was no difference in the values of convergence for the computer monitors' and paper. The symptoms associated with the use of computers are not related with the increase in accommodation and with the horizontal heterophoria values.

Proceedings Article | 26 July 2011 Paper

Imaging of aphakic intraocular lens with a slit-scanning tomography system

Cristina M. Oliveira, J. Almeida, S. Franco

Proceedings Volume 8001, 800135 (2011) https://doi.org/10.1117/12.892082

KEYWORDS: Eye, Imaging systems, Image segmentation, Cornea, Crystals, Cameras, Visualization, Image processing, Tomography, Distortion

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Proceedings Article | 5 June 2009 Open Access

Kindergarten' optics

Manuel M. Costa, Júlia Campos, Madalena Lira, Sandra Franco

Proceedings Volume 9666, 966605 (2009) https://doi.org/10.1117/12.2207953

KEYWORDS: Eye, Light sources, Lamps, Eye models, Light, Mirrors, Retina, Active optics, Optical communications, Photonics

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Proceedings Article | 18 July 2007 Paper

A new optical system for 3-dimensional mapping of the cornea

Sandra Franco, José Almeida

Proceedings Volume 6631, 66311J (2007) https://doi.org/10.1117/12.727060

KEYWORDS: Cornea, Cameras, Eye, Fluctuations and noise, Image segmentation, Imaging systems, Optical spheres, Collimation, Tomography, Data acquisition

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Proceedings Article | 30 October 1997 Paper

Automation of contact lens' fitting evaluation by digital image processing

Manuel Costa, Rui Barros, Sandra Franco

Proceedings Volume 3164, (1997) https://doi.org/10.1117/12.279561

KEYWORDS: Image processing, Eye, Digital image processing, Refraction, Glasses, Cornea, Visualization, Luminescence, CCD cameras, Data communications

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Showing 5 of 10 publications

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