Article
Ophthalmology
David A. Atchison, Marwan Suheimat, Stanislovas Zacharovas, Charles E. Campbell
Summary: Through simulations, it was found that Grand-Seiko autorefractors with annular targets are likely to provide valid peripheral refractions. The results were closer to Zernike refractions and spherical aberration had up to 0.5D impact on refraction, while peripheral coma had limited influence.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Charles E. Campbell, Marwan Suheimat, Stanislovas Zacharovas, David A. Atchison
Summary: The study focused on the optical principles and properties of autorefractors that use the image-size principle. It was found that when light is diverging, hyperopia produces greater retinal image sizes than myopia; conversely, when light is converging, the opposite is true.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Durgasri Jaisankar, Marwan Suheimat, Robert Rosen, David A. Atchison
Summary: This study aimed to investigate whether human peripheral vision can detect local depressions (notches) in CSF, and found that notches were identified in defocused monochromatic CSFs in peripheral vision when all other monochromatic ocular aberrations were corrected, especially with adequate spatial frequency sampling.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
David A. Atchison
Summary: This study uses simulations to investigate the effect of lateral misalignment of the Grand-Seiko WR-5100K autorefractor on peripheral refraction. The results show that misalignment causes significant errors in peripheral refraction, with greater effects when misalignment and visual field are in opposite directions.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
David A. Atchison, Thien Nguyen, Katrina L. Schmid, Archayeeta Rakshit, Alex S. Baldwin, Robert F. Hess
Summary: The purpose of this study was to simulate lens-induced and screen-induced aniseikonia and evaluate their effects on stereopsis. The results showed that the screen-based method was not always successful in simulating the effects of lens-induced aniseikonia on stereopsis. However, the computer-based method was reasonably successful in neutralizing refractive aniseikonia, especially for overall and x180 meridional aniseikonia.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Joanne M. Wood, David A. Atchison, Alex A. Black, Gregoire S. Larue
Summary: This study investigated the effects of lens blur on incorrect colour perception of red signals. The results showed that low levels of blur resulted in a significant misperception of red signals as orange-yellow, particularly for dim signals. The findings have important implications for vision testing and refractive correction of train drivers to prevent color misperception of red train signals.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Dinesh Kaphle, Saulius R. Varnas, Katrina L. Schmid, Marwan Suheimat, Alexander Leube, David A. Atchison
Summary: This study aimed to compare the accommodative errors between emmetropes and myopes and investigate the effect of using different instruments and metrics. It was found that emmetropes had smaller lags of accommodation compared to myopes. There were significant differences between methods and instruments.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Engineering, Electrical & Electronic
Thomas Coppin, Douglas W. Palmer, Krishan Rana, Donald G. Dansereau, Michael J. Collins, David A. Atchison, Jonathan Roberts, Ross Crawford, Anjali Jaiprakash
Summary: Light field cameras have potential for retinal imaging, with benefits of refocusing images and reducing glare. This work designed a light field fundus camera meeting ISO standards, achieving higher spatial resolution.
SIGNAL PROCESSING-IMAGE COMMUNICATION
(2022)
Article
Ophthalmology
David A. Atchison, Jos J. Rozema
Summary: This study provides an overview of the misconceptions and potential artefacts associated with measuring peripheral refractive error and eye length, and discusses their implications for determining retinal shape and myopia development. Several issues were identified, such as the relationship between peripheral refractive error and myopia development, and the accuracy of measuring peripheral eye length using an optical biometer. Some of these issues can be addressed, while others require further investigation.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
Article
Ophthalmology
Dinesh Kaphle, Katrina L. Schmid, Marwan Suheimat, Scott A. Read, David A. Atchison
Summary: The purpose of this study was to investigate the relationship between peripheral choroid thickness and eye length changes during accommodation. The results showed that eye length increased with accommodation, while the choroid thinned. The thinning of the choroid accounted for approximately 60% of the eye length increase.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
Review
Biochemical Research Methods
Susana Marcos, Pablo Artal, David A. Atchison, Karen Hampson, Richard Legras, Linda Lundstrom, Geunyoung Yoon
Summary: This paper discusses the pioneering work in measuring and correcting eye's optical aberrations using adaptive optics (AO), as well as the development and applications of AO visual simulators. These applications have not only facilitated psychophysics research, but also provided non-invasive optical corrections. With the introduction of new technologies and widespread acceptance in the clinical community, AO simulation shows promising prospects for future applications.
BIOMEDICAL OPTICS EXPRESS
(2022)
Article
Biochemical Research Methods
Durgasri Jaisankar, Marwan Suheimat, Robert Rosen, David A. Atchison
Summary: This study compared on-axis and peripheral detection acuities measured with interference fringes and Gabor gratings. The results showed that the peripheral detection acuity was always higher for interference fringes than for Gabor gratings. Additionally, Gabor gratings with sharper edges had higher acuities.
BIOMEDICAL OPTICS EXPRESS
(2022)
Article
Ophthalmology
Annabelle Seddon, Hanna M. Chaki, Hang-My J. D. Phan, Jessica G. Spink, Matthew L. P. Ha, Surini Wijesuriya, David A. Atchison, Andrew Carkeet
Summary: This study investigated how unequal image sizes between the eyes affect visual acuity. The results showed that induced aniseikonia slightly reduced binocular visual acuity, but the change was small and cannot be used as a diagnostic marker in clinical settings.
CLINICAL AND EXPERIMENTAL OPTOMETRY
(2023)
Article
Ophthalmology
Martin de Tomas, Abel Szeps, Gabriel Martin, Juan Manuel Suarez, David A. Atchison, Jos J. Rozema, Rafael Iribarren
Summary: This study analyzed OCT images of retinal shadows caused by defocus and diffusion optics spectacles. The results showed obvious retinal shadows in the periphery of the images, while the central area remained clear. The discrepancy between the actual size of the shadows and their appearance in the OCT images was attributed to the scanning OCT beam not being parallel to the optical axis. With device-specific correction, retinal OCT images can help visualize the regions affected by defocus or lowered contrast induced by myopia control spectacles.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
Article
Ophthalmology
David A. Atchison, David L. Cooke
Summary: A thin lens technique was developed to determine how the effective powers of toric monofocal intraocular lenses (IOLs) are influenced by tilt and refractive errors. The correction required at the front of the eye and the power of an IOL that would compensate for the tilt were determined through a series of steps.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
