Research Topics
| A RoordaSummaryAffiliation: University of Houston Country: USA Publications
| Collaborators
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Detail Information
Publications
Optical fiber properties of individual human conesAustin Roorda
University of Houston College of Optometry, Houston, TX, USA
J Vis 2:404-12. 2002..The implication is that the optical fiber properties of an ensemble of cones mimic the tuning properties of a single cone...- Adaptive optics ophthalmoscopyA Roorda
University of Houston College of Optometry, TX, USA
J Refract Surg 16:S602-7. 2000..Application of adaptive optics technology for ophthalmoscopy promises continued progress toward understanding the basic properties of the living human retina and also for clinical applications... - Wave aberrations of the isolated crystalline lensAustin Roorda
College of Optometry, University of Houston, Houston, TX, USA
J Vis 4:250-61. 2004.... - Evaluating the lateral resolution of the adaptive optics scanning laser ophthalmoscopeYuhua Zhang
University of California, Berkeley, School of Optometry, Room 485, Minor Hall, Berkeley, California 94720 2020, USA
J Biomed Opt 11:014002. 2006..We also reveal the relationships among the lateral resolution and other three measures of the AOSLO imaging property including the Strehl ratio, the PSF, and the root mean square (rms) of wavefront aberration... - Wave aberrations in rhesus monkeys with vision-induced ametropiasRamkumar Ramamirtham
College of Optometry, University of Houston, 505 J Davis Armistead Building, Houston, TX 77204 2020, USA
Vision Res 47:2751-66. 2007..The results from our study suggest that the higher amounts of wave aberrations observed in ametropic humans are likely to be a consequence, rather than a cause, of abnormal refractive development... - The arrangement of the three cone classes in the living human eyeA Roorda
Center for Visual Science, University of Rochester, New York 14627, USA
Nature 397:520-2. 1999..This arrangement reduces the eye's ability to recover colour variations of high spatial frequency in the environment but may improve the recovery of luminance variations of high spatial frequency... - Packing arrangement of the three cone classes in primate retinaA Roorda
University of Houston College of Optometry, Houston, TX 77204 6052, USA
Vision Res 41:1291-306. 2001..In all eyes, the M and L cones are arranged randomly. This gives rise to patches containing cones of a single type. In human, but not in monkey, the arrangement of S-cones cannot be distinguished from random... - Optical slicing of human retinal tissue in vivo with the adaptive optics scanning laser ophthalmoscopeFernando Romero-Borja
College of Optometry, University of Houston, 4800 Calhoun Road, Houston, Texas 77204 2020, USA
Appl Opt 44:4032-40. 2005.... - Adaptive optics scanning laser ophthalmoscopy for in vivo imaging of lamina cribrosaAbhiram S Vilupuru
College of Optometry, University of Houston, TX 77204 2020, USA
J Opt Soc Am A Opt Image Sci Vis 24:1417-25. 2007..The AOSLO provides high-quality images of the lamina cribrosa and may have potential as a tool for early identification of glaucoma... - Effects of optically imposed astigmatism on emmetropization in infant monkeysChea su Kee
College of Optometry, University of Houston, Houston, Texas 77204 2020, USA
Invest Ophthalmol Vis Sci 45:1647-59. 2004..Although astigmatism is prevalent during early infancy, the influence of astigmatism on early refractive development is unclear. This study was undertaken to determine the effects of astigmatism on emmetropization in monkeys... - Spatially variant changes in lens power during ocular accommodation in a rhesus monkey eyeAbhiram S Vilupuru
College of Optometry, University of Houston, Houston, TX, USA
J Vis 4:299-309. 2004..The greater increase in optical power near the central region of the lens, combined with an accommodative pupillary miosis, would serve to maximize accommodative refractive change while maintaining acceptable image quality... - A population study on changes in wave aberrations with accommodationHan Cheng
College of Optometry, University of Houston, Houston, TX 77204 2020, USA
J Vis 4:272-80. 2004..Therefore, a typical eye will benefit over the entire accommodative range (0-6 D) if aberrations are corrected for distance viewing... - Theoretical modeling and evaluation of the axial resolution of the adaptive optics scanning laser ophthalmoscopeKrishnakumar Venkateswaran
College of Optometry, University of Houston, Houston, TX 77204 2020, USA
J Biomed Opt 9:132-8. 2004..However, when small pinholes are used to maximize resolution, alignment becomes critical... - Predicting and assessing visual performance with multizone bifocal contact lensesJoy A Martin
University of Houston College of Optometry, 505 J Davis Armistead Bldg, Houston, TX 77204 2020, USA
Optom Vis Sci 80:812-9. 2003..Also, to investigate the relationship between the patient's predicted and actual visual benefit with bifocal contact lenses... - Optimal pupil size in the human eye for axial resolutionWilliam J Donnelly
University of Houston College of Optometry, 505 J Davis Armistead Building, Houston, Texas 77204 2020, USA
J Opt Soc Am A Opt Image Sci Vis 20:2010-5. 2003..66 mm (sd)]. When small confocal pinholes are used, the maximum detected light is obtained with a pupil size of 4.90 mm +/- 1.04 mm sd. It is recommended to use larger pupil sizes in imaging applications where axial resolution is desired... - Monochromatic ocular wave aberrations in young monkeysRamkumar Ramamirtham
College of Optometry, University of Houston, Houston, TX 77204-2020, USA
Vision Res 46:3616-33. 2006.... - Photon signal detection and evaluation in the adaptive optics scanning laser ophthalmoscopeYuhua Zhang
School of Optometry, University of California, Berkeley 94720 2020, USA
J Opt Soc Am A Opt Image Sci Vis 24:1276-83. 2007..The study presents a practical strategy that can be used to test the photodetector for either initial evaluation or subsequent performance in in-line inspection... - MEMS-based adaptive optics scanning laser ophthalmoscopyYuhua Zhang
School of Optometry, University of California, California 94720 2020, USA
Opt Lett 31:1268-70. 2006..The significant increase in throughput allows for a confocal pinhole whose diameter is less than the Airy disc of the collection lens, thereby fully exploiting the axial resolution capabilities of the system... - Direct and noninvasive assessment of parafoveal capillary leukocyte velocityJoy A Martin
College of Optometry, University of Houston, Houston, Texas, USA
Ophthalmology 112:2219-24. 2005..77 to 2.10 mm/second. Leukocytes were not visible in all parafoveal capillaries. CONCLUSIONS: Parafoveal capillary leukocyte velocity can be directly and noninvasively measured without the use of contrast dyes using an AOSLO... - Visual performance in emmetropia and low myopia after correction of high-order aberrationsEthan A Rossi
School of Optometry, University of California, Berkeley, CA 94720, USA
J Vis 7:14. 2007..Optical aberrations do not limit VA in low myopia after AO correction. There is no difference in the high-order aberrations of emmetropes and low myopes. Retinal and/or cortical factors limit VA in low myopes after AO correction... - Dynamic visual stimulus presentation in an adaptive optics scanning laser ophthalmoscopeSiddharth Poonja
University of California, Berkeley School of Optometry, Berkeley, CA 94720-2020, USA
J Refract Surg 21:S575-80. 2005..89-mm pupil. CONCLUSIONS: Dynamic visual stimulus presentation in an AOSLO works effectively and expands the scope of AOSLO applications. S5.. - High-resolution imaging with adaptive optics in patients with inherited retinal degenerationJacque L Duncan
Department of Ophthalmology, University of California, San Francisco School of Medicine, San Francisco, California 94143 0730, USA
Invest Ophthalmol Vis Sci 48:3283-91. 2007..To investigate macular photoreceptor structure in patients with inherited retinal degeneration using high-resolution images and to correlate the findings with clinical phenotypes and genetic mutations... - Automated identification of cone photoreceptors in adaptive optics retinal imagesKaccie Y Li
School of Optometry, University of California, Berkeley, CA 94720, USA
J Opt Soc Am A Opt Image Sci Vis 24:1358-63. 2007..The consistency of our measurements demonstrates the reliability and practicality of having an automated solution to this problem... - Applying wavefront sensors and corneal topography to keratoconusJason Marsack
Biomedical Engineering Dept, University of Texas at Austin, Austin, TX 78712, USA
Biomed Sci Instrum 38:471-6. 2002..The lenses will be formed from thick, pre-fabricated soft contact lenses using laser ablation. Preliminary ablation of these lenses is demonstrated using a femptosecond Ti: Sapphire (Ti:Al2O3) laser system... - High-resolution retinal imaging of cone-rod dystrophyJessica I Wolfing
Center for Visual Science, University of Rochester, Rochester, New York 14627, USA
Ophthalmology 113:1019.e1. 2006..CONCLUSIONS: Adaptive optics ophthalmoscopy is a noninvasive technique to observe a patient's retinal pathology directly at a cellular level. It can provide a quantitative measurement of photoreceptor loss in retinal disease... - Deconvolution of adaptive optics retinal imagesJulian C Christou
Center for Adaptive Optics, University of California, Santa Cruz, California 95064, USA
J Opt Soc Am A Opt Image Sci Vis 21:1393-401. 2004..The results show that the error in classification between the L and M cones is reduced by a factor of 2, thereby reducing the number of images required by a factor of 4... - Monochromatic aberrations provide an odd-error cue to focus directionBrent J Wilson
College of Optometry, University of Houston, Texas 77204-2020, USA
J Opt Soc Am A Opt Image Sci Vis 19:833-9. 2002..It was found that the ability to discriminate PSFs for different directions of defocus varied among individuals but, in general, depended on the magnitude of monochromatic aberrations... - Pulsatility of parafoveal capillary leukocytesJoy A Martin
University of Houston, College of Optometry, Houston, TX 77004 2020, USA
Exp Eye Res 88:356-60. 2009..By controlling for the variation in leukocyte velocity caused by the cardiac cycle, we can better detect other changes in retinal leukocyte velocity induced by disease or pharmaceutical agents... - High-resolution in vivo imaging of the RPE mosaic in eyes with retinal diseaseAustin Roorda
UC Berkeley School of Optometry, University of California, Berkeley, Berkeley, California 94720 2020, USA
Invest Ophthalmol Vis Sci 48:2297-303. 2007..To use high-resolution and contrast imaging techniques to reveal microscopic retinal structures, including individual retinal pigment epithelial (RPE) cells, in human eyes with inherited retinal disease... - Intrinsic signals from human cone photoreceptorsKate Grieve
School of Optometry, University of California, Berkeley, CA 94720 2020, USA
Invest Ophthalmol Vis Sci 49:713-9. 2008..To develop noninvasive means to relate structure to function in human eyes, the authors investigated intrinsic retinal signals at high resolution using an adaptive optics scanning laser ophthalmoscope (AOSLO)...