Review
Ophthalmology
Joaquin Fernandez, Manuel Rodriguez-Vallejo, Noemi Burguera, Carlos Rocha-de-Lossada, David P. Pinero
Summary: This article summarizes various technologies and methods for extending depth of focus, including corneal laser refractive surgery and intraocular lens implantation. It also discusses why inducing spherical aberration as a way to extend depth of focus doesn't have a universal solution.
JOURNAL OF CATARACT AND REFRACTIVE SURGERY
(2021)
Article
Chemistry, Analytical
Kunhua Zhou, Zhizheng Wu, Tianyu Zhang, Feng Li, Azhar Iqbal, Suresh Sivanandam
Summary: A laser scanning confocal microscope (LSCM) is widely used in the field of biological detection to study sub-micron structures. However, the optical aberrations introduced by living biological tissue limit the illumination depth of LSCMs and affect the image resolution. In this study, an image-based adaptive optics technology with an optimized stochastic parallel gradient descent (SPGD) algorithm and adaptive coefficient is proposed to minimize the effect of optical aberrations. Experimental results show that this adaptive optics system effectively reduces aberration interference during depth imaging.
Article
Multidisciplinary Sciences
Einat Shneor, David P. Pinero, Ravid Doron
Summary: This study found that despite good visual acuity, patients with mild keratoconus showed decreased contrast sensitivity and increased higher-order aberrations compared to controls. Most higher-order aberrations were negatively correlated with contrast sensitivity.
SCIENTIFIC REPORTS
(2021)
Review
Engineering, Biomedical
Cara T. Motz, Victoria Kabat, Tarun Saxena, Ravi Bellamkonda, Cheng Zhu
Summary: The brain processes information through highly connected networks of neurons, utilizing specific cellular structures and molecules. Recent studies have indicated the importance of mechanical cues in regulating neuronal development and function. Mechanical signals play a key role in the development, maintenance, and interneuronal communication of neural structures.
ADVANCED HEALTHCARE MATERIALS
(2021)
Article
Biology
Antoine Barbot, Woon Ju Park, Cherlyn J. Ng, Ru-Yuan Zhang, Krystel R. Huxlin, Duje Tadin, Geunyoung Yoon
Summary: The study reveals evidence of functional reallocation of sensory processing resources following long-term exposure to poor optical quality. Patients with keratoconus showed altered contrast sensitivity under fully-corrected optical conditions, with impaired sensitivity for fine spatial details and better-than-typical sensitivity for coarse spatial details, which were more pronounced in patients experiencing poorer optical quality in their daily life and mediated by changes in signal enhancement mechanisms. This suggests that adult neural processing adapts to better match the changes in sensory inputs caused by long-term exposure to altered optics.
Article
Medicine, General & Internal
Natsuki Kusada, Norihiko Yokoi, Chie Sotozono
Summary: This study used a videokeratographer to continuously measure higher-order aberrations (HOAs) in dry eye disease (DED) patients and investigated the factors that determine HOAs. The results show that HOAs at 1 or 2 seconds after eye opening can reflect tear film instability and corneal epithelial damage in DED patients. This finding may be helpful for the rapid and non-invasive detection and evaluation of visual function decline in DED patients with various clinical features.
Article
Optics
Mike Chih-Wei Yeh, John Ching-Jen Hsiao, Dorcas Tsang, Frank Spors, Ching-Ying Cheng
Summary: The purpose of this study was to compare the effects of different types of soft contact lenses on peripheral refraction, higher-order aberrations, horizontal coma, and visual quality in young myopic adults. The results showed that the SoftOK and MiSight lenses performed better in terms of relative peripheral refraction, myopic defocus, and horizontal coma. The MiSight lens slightly reduced accommodative amplitude, and the SoftOK lens had significantly higher spherical aberration compared to the other lenses. However, the differences in horizontal coma were not statistically significant.
Article
Medicine, General & Internal
Luis Salva, Scott Garcia, Salvador Garcia-Delpech, Anabel Martinez-Espert, Vicente Ferrando
Summary: The aim of this study was to evaluate the impact of different spherical aberration values on the optical performance of the FEMTIS Comfort intraocular lens. The results showed that increasingly negative spherical aberration values made the lens more bifocal, moderating its extended-depth-of-focus characteristic. Conversely, higher positive spherical aberration values shifted the through-focus modulation transfer function curve towards positive vergences, leading to worsened distance vision in the +1.00 to +2.00 D range, but improved vision in the +0.50 D to +1.00 D range. Therefore, assessing spherical aberration in patients before implanting asymmetric intraocular lenses is necessary for predicting outcomes and making informed decisions based on patients' visual requirements.
JOURNAL OF CLINICAL MEDICINE
(2023)
Article
Multidisciplinary Sciences
Yuanlong Zhang, Xiaofei Song, Jiachen Xie, Jing Hu, Jiawei Chen, Xiang Li, Haiyu Zhang, Qiqun Zhou, Lekang Yuan, Chui Kong, Yibing Shen, Jiamin Wu, Lu Fang, Qionghai Dai
Summary: The researchers have developed an integrated microscope that is 0.15 cm(3) in volume and weighs 0.5 g, which outperforms a commercial microscope and can be seamlessly integrated with a smartphone.
NATURE COMMUNICATIONS
(2023)
Article
Ophthalmology
John S. M. Chang, Sylvia C. T. Liu, Nadine T. C. Ma, Jack C. M. Ng
Summary: This study aims to report the visual outcomes and quality of vision and life after bilateral implantation of a single-piece trifocal intraocular lens (IOL) in Chinese patients. The results showed that implantation of the trifocal IOL provided satisfactory visual outcomes and quality of vision and life, resulting in a high rate of spectacle independence.
JOURNAL OF CATARACT AND REFRACTIVE SURGERY
(2023)
Article
Optics
Lihui Wang, Satoshi Tabata, Hongjin Xu, Yunpu Hu, Yoshihiro Watanabe, Masatoshi Ishikawa
Summary: Dynamic projection mapping is an interactive display technology that enables augmented reality with naked eyes. However, the fixed and shallow depth-of-field of projectors limits its applications. This work presents a high-speed projection mapping method with dynamic focal tracking based on a variable focus lens. The system includes a high-speed variable focus lens, a high-speed camera, and a high-speed projector, allowing the detection of depth and rotation information for real-time correction and updating of projection information. As a result, well-focused projection is achieved even on 3D dynamic moving objects. The high-speed prototype has a response speed of around 5 ms, and the dynamic projection range covers from 0.5 to 2.0 m.
Article
Optics
Tae Moon Jeong, Sergei Bulanov, Petr Valenta, Georg Korn, Timur Zh Esirkepov, James K. Koga, Alexander S. Pirozhkov, Masaki Kando, Stepan S. Bulanov
Summary: The article focuses on the intensification of electromagnetic fields towards values typical for strong field quantum electrodynamics, proposing schemes based on relativistic-flying mirrors. It describes how relativistic-flying parabolic mirrors reflect electromagnetic radiation, leading to high frequency focused waves, and investigates electron-positron pair production under enhanced electromagnetic fields. Theoretical analyses are provided for ideal flying mirrors, and it is shown that electron-positron pairs can be created by colliding counterpropagating relativistic-flying laser focuses in vacuum.
Article
Ophthalmology
Cherlyn J. Ng, Ramkumar Sabesan, Antoine Barbot, Martin S. Banks, Geunyoung Yoon
Summary: The study found that both emmetropic eyes and keratoconus patients showed contrast constancy when viewing with their native optics. However, when optical correction was applied, keratoconus patients exhibited underconstancy, possibly due to a lack of experience with fine spatial detail.
INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE
(2022)
Article
Ophthalmology
Vaishal P. Kenia, Raj V. Kenia, Laxmi Mudaliya, Onkar H. Pirdankar
Summary: This retrospective case series studied the visual outcomes and higher order aberrations in eyes implanted with Hybrid EDOF IOL, specifically in Indian eyes. The study found that the LUCIDIS IOL provided excellent vision at all distances, which could be attributed to its design as a spherical aberration neutral lens.
TAIWAN JOURNAL OF OPHTHALMOLOGY
(2023)
Article
Ophthalmology
Jiakai Lyu, Seung Pil Bang, Geunyoung Yoon
Summary: This study aimed to develop a refractive extended depth-of-focus (EDoF) ophthalmic lens based on a periodic power profile. The proposed design method effectively distributed light energy and provided a continuous depth of focus. However, it showed a slightly higher dependence on changes in pupil size and lens decentration compared to the diffractive trifocal design.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
Article
Ophthalmology
Karolinne Maia Rocha, Laurent Vabre, Nicolas Chateau, Ronald R. Krueger
JOURNAL OF REFRACTIVE SURGERY
(2010)
Article
Ophthalmology
Karolinne Maia Rocha, Laurent Vabre, Fabrice Harms, Nicolas Chateau, Ronald R. Krueger
JOURNAL OF REFRACTIVE SURGERY
(2007)
Article
Ophthalmology
R Legras, N Chateau, WN Charman
OPTOMETRY AND VISION SCIENCE
(2004)
Article
Ophthalmology
R Legras, N Chateau, WN Charman
OPTOMETRY AND VISION SCIENCE
(2004)
Review
Ophthalmology
WN Charman, N Chateau
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2003)
Article
Ophthalmology
J De Brabander, N Chateau, G Marin, N Lopez-Gil, E Van der Worp, A Benito
OPTOMETRY AND VISION SCIENCE
(2003)
Article
Ophthalmology
N López-Gil, JF Castejón-Mochón, A Benito, JM Marín, G Lo-A-Foe, G Marin, B Fermigier, D Renard, D Joyeux, N Château, P Artal
JOURNAL OF REFRACTIVE SURGERY
(2002)
Article
Ophthalmology
R Legras, V Hornain, A Monot, N Chateau
OPTOMETRY AND VISION SCIENCE
(2001)