Browsing by Subject "adaptive optics"
Now showing items 1-13 of 13
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Analysis of cone mosaic reflectance properties in healthy eyes and in eyes with nonproliferative diabetic retinopathy over time
(Association for Research in Vision and Ophthalmology (ARVO), 2017-08-18)PURPOSE. We investigate the reflectance properties of the cone mosaic in adaptive optics (AO) images of healthy subjects and subjects with nonproliferative diabetic retinopathy (NPDR) over time. METHODS. We acquired images ... -
Detection of faint companions through stochastic speckle discrimination
(IOP Publishing, 2008-09-10)We propose a new postprocessing technique for the detection of faint companions from a sequence of adaptive optics corrected short exposures. The algorithm exploits the difference in shape between the on-axis and off-axis ... -
Experimental validation of a bayesian model of visual acuity
(Association for Research in Vision and Ophthalmology (ARVO), 2009-07-01)Based on standard procedures used in optometry clinics, we compare measurements of visual acuity for 10 subjects (11 eyes tested) in the presence of natural ocular aberrations and different degrees of induced defocus, with ... -
Experimentally observe the effect of spherical aberration on diffractive intraocular lens using adaptive optics
(SPIE-Intl Soc Optical Eng, 2015-03-12)We first investigated the similarity in optical quality of a batch of diffractive intraocular lenses (DIOLs), providing experimental evidence for one DIOL as representative of a batch. Using adaptive optics, we then evaluated ... -
High speed optical wavefront sensing with low cost fpgas
(Walter de Gruyter GmbH, 2008-01-01)This paper outlines a study into deployment of a parallel processing scheme on an FPGA to meet the needs of high bandwidth processing in adaptive optics wavefront sensing. By exploiting a multi-stage pipeline approach we ... -
Inverse optical design of the human eye using likelihood methods and wavefront sensing
(The Optical Society, 2008-01-01) -
Investigation of the isoplanatic patch and wavefront aberration along the pupillary axis compared to the line of sight in the eye
(The Optical Society, 2012-01-03) -
Measuring the absolute height and profile of the mesospheric sodium layer using a continuous wave laser
(EDP Sciences, 2003-05-01)We have developed and tested a novel method, based on LIDAR, of measuring the height and profile of the mesospheric sodium layer using a continuous wave laser. It is more efficient than classical LIDAR as the laser is on ... -
Performance analysis of cone detection algorithms
(The Optical Society, 2015-03-04) -
Phasing segmented mirrors using defocused images at visible wavelengths
(Oxford University Press (OUP), 2006-02-21)Plans for future optical telescopes of diameter more than 10 m are based on segmented mirrors, made up of hundreds or even thousands of segments. A challenge for these telescopes is the alignment in piston (cophasing) where ... -
Reliability and agreement between metrics of cone spacing in adaptive optics images of the human retinal photoreceptor mosaic
(Association for Research in Vision and Ophthalmology (ARVO), 2017-06-20)PURPOSE. To assess reliability and agreement among three metrics used to evaluate the distribution of cell distances in adaptive optics (AO) images of the cone mosaic. METHODS. Using an AO flood illumination retinal camera, ... -
Shack-Hartmann Wavefront Sensing of Optical Vortices in a Turbulent Field
(2011-07-18)An optical vortex is a point on an optical wavefront where there is a null of intensity and the phase is undefined. When the phase is defined over the range 2 pi radians, as is commonly done, the phase surrounding the ... -
Using spatial light modulators to investigate the limitations of adaptive optics performance for the European Extremely Large Telescope
(NUI Galway, 2024-02-02)The European Extremely Large Telescope (E-ELT) will be the world’s largest ground based optical / near-infrared telescope ever built. Its primary mirror, M1, will be 39 m in diameter and consist of 798 individual hexagonal ...