Optical Aberrations
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Optimized microlens-array geometry for Hartmann-Shack wavefront sensor: design, fabrication and test
The Hartmann-Shack (H-S) wavefront sensor is now deployed in many different fields, from astronomy to industrial inspection, where the quality of optical media or components can be measured by the distortions (wavefront aberrations) they impart on a wavefront transmitted or reflected by them. In ophthalmology, this sensor is a core component of major aberrom
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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2. Different schematic eyes and their accuracy to the in vivo eye: a quantitative comparison study
Current ophthalmic technology allows the manipulation of eye components, such as anterior cornea and lens, of the human eye with a considerable precision and customization. This technology opens up the possibility of exploiting some characteristics of the eye in order to improve the methods of correcting optical aberrations. Moreover, product development and
Brazilian Journal of Physics. Publicado em: 2007-06
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3. Aberrações de alta ordem : associação com a idade e erros de refração / Relationship between order aberrations and age and refraction errors
Purpose: to evaluate the relationship between high order aberrations and refraction errors, and between high order aberrations and age. Methods: an analytic retrospective study of patients that underwent aberrometry exam was done. All the subjects examined at LADARWAVE® aberrometer at Hospital de Olhos do Paraná from April 2004 to April 2005 were included
Publicado em: 2006
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4. Estudo dos erros sistemáticos inerentes a um sensor de estrelas de cabeça fixa, quando à localização relativa de estrelas / Study of systematic errors inherent to fixed-head star trackers with respect to the relative position of stars
Star trackers are attitude sensors used in spacecrafts capable of providing accurate attitude in arc-seconds range. The attitude information is provided when the star coordinates, measured by the sensor in its frame, are compared with known star directions obtained from a star catalog. Nevertheless, as in all measurement instruments, the measures are likely
Publicado em: 2005
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5. Preliminary results of an instrument for measuring the optical aberrations of the human eye
The human eye, as our biological vision instrument, contains intrinsic optical defects, referred to as optical aberrations or ametropia. The immediate consequence of such aberrations is poor quality of images formed at the retina. With the advent of more precise pulsed lasers for eye surgery, the development of instrumentation to determine precisely the high
Brazilian Journal of Physics. Publicado em: 2003-03
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6. Measuring higher order optical aberrations of the human eye: techniques and applications
In the present paper we discuss the development of "wave-front", an instrument for determining the lower and higher optical aberrations of the human eye. We also discuss the advantages that such instrumentation and techniques might bring to the ophthalmology professional of the 21st century. By shining a small light spot on the retina of subjects and observi
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-11
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7. Geometrical methods for evaluation of opticals centered systems. / Métodos geométricos para a avaliação de sistemas ópticos centrados
Three methods of ray tracing are development for use on IBM PC/XT personal computer. The first method is a paraxial ray tracing derived from the invariant Abbe; the second is a meridional ray tracing proposed by Rudolf Kingslake; and the third is a skew ray tracing proposed by Heinz Haferkorn and Volker Tautz . Based on these three methods some optical aberr
Publicado em: 1991
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8. Adaptive aberration correction in a confocal microscope
The main advantage of confocal microscopes over their conventional counterparts is their ability to optically “section” thick specimens; the thin image slices thus obtained can be used to reconstruct three-dimensional images, a capability which is particularly useful in biological applications. However, it is well known that the resolution and optical se
The National Academy of Sciences.
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9. Ultrahigh-resolution multicolor colocalization of single fluorescent probes
An optical ruler based on ultrahigh-resolution colocalization of single fluorescent probes is described in this paper. It relies on the use of two unique families of fluorophores, namely energy-transfer fluorescent beads (TransFluoSpheres) and semiconductor nanocrystal quantum dots, that can be excited by a single laser wavelength but emit at different wavel
The National Academy of Sciences.
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10. Membrane specific mapping and colocalization of malarial and host skeletal proteins in the Plasmodium falciparum infected erythrocyte by dual-color near-field scanning optical microscopy
Accurate localization of proteins within the substructure of cells and cellular organelles enables better understanding of structure–function relationships, including elucidation of protein–protein interactions. We describe the use of a near-field scanning optical microscope (NSOM) to simultaneously map and detect colocalized proteins within a cell, with
National Academy of Sciences.