D. Lafaille - Academia.edu (original) (raw)

Papers by D. Lafaille

Full-field AO-assisted OCT for high-resolution tomographic imaging of the retina

Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 2006

Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving... more Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving the performances of the existing observing techniques, either in imaging or tomography, have been made. For long, Adaptive Optics have proven its ability to restore high lateral resolution with the SLO or flood imaging, or more recently to enhance the interferometric contrast and hence, the sensitivity, of

Ophthalmic applications of adaptive optics imaging in the human eye

It is now well known that applying Adaptive Optics to ophthalmology allows one to resolve some ty... more It is now well known that applying Adaptive Optics to ophthalmology allows one to resolve some types of cones located in the fovea. We demonstrate that the study of blood flow in micro vessels (less than 10 microns in diameter) of the retina is also possible using both Adaptive Optics and simple a posteriori image processing techniques.

Eye examination device by means of tomography with a sighting device

High resolution laterial and axial tomography

High spatial resolution imagery and tomography of in vivo human retinas

Blood Flow in Retinal Micro Vessels

In vivo retinal imaging at a micrometer scale using an adaptive optics system: preliminary results

Journal Français d Ophtalmologie

Subject index to volume 230

Optics Communications, 2004

In vivo imaging of the retina on humans by means of adaptive optics can lead to a significant gai... more In vivo imaging of the retina on humans by means of adaptive optics can lead to a significant gain in resolution. We demonstrate the realization and use of a system made of a Shack-Hartmann wavefront sensor carefully matched to a 13-actuator bimorph deformable mirror sensor, operating at a closed loop frequency of 70 Hz at k ¼ 835 nm. Even with this simple but optimized system with 12 degrees of freedom, correcting only aberrations of moderate orders, we routinely and systematically obtain retinal images containing spatial information up to half the diffraction limit frequency of a dilated (7 mm) iris at a k ¼ 550 nm wavelength (1.6 lm diffraction spot size). Signal-to-noise ratio on the images is limited by eye safety constraints, but is sufficient to reach the high-frequency information on single, shortexposure (7 ms) images, which clearly show individual cones and capillary details. Correction is highly depending on proper centering of the eye, achieved with an active target. Focusing through the retina is possible with a reduced depth of focus. Variability of moderate order aberrations among dilated subjects has been observed. Using an image fitting algorithm, individual images are used to build a wider field corrected image of the retina ð%3°), possibly useful for diagnosis and microcirculation analysis.

In vivo retinal imaging at a micrometer scale using an adaptive optics system: preliminary results

DEVICE AND METHOD FOR MEASURING THE CONTRAST OF THE FRINGES IN A MICHELSON INTERFEROMETER AND SYSTEM FOR EXAMINATION OF THE EYE COMPRISING SUCH A DEVICE

Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 2006

Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving... more Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving the performances of the existing observing techniques, either in imaging or tomography, have been made. For long, Adaptive Optics have proven its ability to restore high lateral resolution with the SLO or flood imaging, or more recently to enhance the interferometric contrast and hence, the sensitivity, of

Full-field AO-assisted OCT for high-resolution tomographic imaging of the retina

Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 2006

Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving... more Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving the performances of the existing observing techniques, either in imaging or tomography, have been made. For long, Adaptive Optics have proven its ability to restore high lateral resolution with the SLO or flood imaging, or more recently to enhance the interferometric contrast and hence, the sensitivity, of

Ophthalmic applications of adaptive optics imaging in the human eye

It is now well known that applying Adaptive Optics to ophthalmology allows one to resolve some ty... more It is now well known that applying Adaptive Optics to ophthalmology allows one to resolve some types of cones located in the fovea. We demonstrate that the study of blood flow in micro vessels (less than 10 microns in diameter) of the retina is also possible using both Adaptive Optics and simple a posteriori image processing techniques.

Eye examination device by means of tomography with a sighting device

High resolution laterial and axial tomography

High spatial resolution imagery and tomography of in vivo human retinas

Blood Flow in Retinal Micro Vessels

In vivo retinal imaging at a micrometer scale using an adaptive optics system: preliminary results

Journal Français d Ophtalmologie

Subject index to volume 230

Optics Communications, 2004

In vivo imaging of the retina on humans by means of adaptive optics can lead to a significant gai... more In vivo imaging of the retina on humans by means of adaptive optics can lead to a significant gain in resolution. We demonstrate the realization and use of a system made of a Shack-Hartmann wavefront sensor carefully matched to a 13-actuator bimorph deformable mirror sensor, operating at a closed loop frequency of 70 Hz at k ¼ 835 nm. Even with this simple but optimized system with 12 degrees of freedom, correcting only aberrations of moderate orders, we routinely and systematically obtain retinal images containing spatial information up to half the diffraction limit frequency of a dilated (7 mm) iris at a k ¼ 550 nm wavelength (1.6 lm diffraction spot size). Signal-to-noise ratio on the images is limited by eye safety constraints, but is sufficient to reach the high-frequency information on single, shortexposure (7 ms) images, which clearly show individual cones and capillary details. Correction is highly depending on proper centering of the eye, achieved with an active target. Focusing through the retina is possible with a reduced depth of focus. Variability of moderate order aberrations among dilated subjects has been observed. Using an image fitting algorithm, individual images are used to build a wider field corrected image of the retina ð%3°), possibly useful for diagnosis and microcirculation analysis.

In vivo retinal imaging at a micrometer scale using an adaptive optics system: preliminary results

DEVICE AND METHOD FOR MEASURING THE CONTRAST OF THE FRINGES IN A MICHELSON INTERFEROMETER AND SYSTEM FOR EXAMINATION OF THE EYE COMPRISING SUCH A DEVICE

Coherence Domain Optical Methods and Optical Coherence Tomography in Biomedicine X, 2006

Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving... more Since the advent of Adaptive Optics in ophthalmic instrumentation, several attempts for improving the performances of the existing observing techniques, either in imaging or tomography, have been made. For long, Adaptive Optics have proven its ability to restore high lateral resolution with the SLO or flood imaging, or more recently to enhance the interferometric contrast and hence, the sensitivity, of