Results 101 to 110 of about 93,210 (330)

Optical Tests of a 3.7-m diameter Liquid Mirror: Behavior under External Perturbations

, 2001
We have built and tested a 3.7-m diameter liquid mirror that rotates on a ball bearing. We have carried out extensive optical tests. We find that although the ball bearing has a poor quality, the quality of the mirror, with mercury layers 1-mm thick, is ...
Biesel, Borra, Borra, Borra, Borra, Cabanac, Content, Gibson, Girard, Hickson, Hickson, Hickson, Kobayashi, Ninane, Roddier, Shack, Sica, Sica, Thibault, Thibault, Wuerker   +20 more
core   +1 more source

Preschool Children Exhibit Evident Compensatory Role of Internal Astigmatism in Distribution of Astigmatism: The Nanjing Eye Study.

Investigative Ophthalmology and Visual Science, 2019
Purpose To determine the prevalence and associated risk factors for total, corneal, and residual astigmatism and to evaluate the relations between components of astigmatism in Chinese preschool children. Methods In the population-based, cross-sectional
Zijin Wang, Dan Huang, Xuejuan Chen, Hui Zhu, Qigang Sun, Yue Wang, xiaohan zhang, Yue Wang, Leili Zhai, Chenyang Wang, Hu Liu   +10 more
semanticscholar   +1 more source

Reproducibility in the identification of retinal positions on serial fundus photographs: Theory and limitations

Acta Ophthalmologica, EarlyView.
Abstract Background Imaging of the retina is accompanied by distortions so that positions in fundus photographs cannot be linearly translated to positions in the retinal fundus. The purpose of this study was to describe an algorithm and evaluate its reproducibility in identifying points on the retina from their representation on serial fundus ...
Toke Bek, Giovanni Ometto
wiley   +1 more source

Aberration-corrected STEM imaging of 2D materials: Artifacts and practical applications of threefold astigmatism [PDF]

, 2020
Sergei Lopatin, Areej Aljarb, Vladimir Roddatis, Tobias Meyer, Yi Wan, Jui‐Han Fu, Mohamed Nejib Hedhili, Yimo Han, Lain‐Jong Li, Vincent Tung   +9 more
openalex   +1 more source

Characterization of retinal pigment epithelium layer in healthy and diseased retinas with high‐resolution adaptive optics transscleral flood illumination imaging

Acta Ophthalmologica, EarlyView.
Abstract Purpose The retinal pigment epithelium (RPE) is critical in the pathophysiology of retinal diseases, such as age‐related macular degeneration. Adaptive optics transscleral flood illumination (AO‐TFI) offers rapid, detailed morphometric characterization of the RPE layer.
Leila Sara Eppenberger, Safa Mohanna, Sohrab Ferdowsi, Sonja Simon‐Zoula, Oliver Pfäffli, Christoph Amstutz, Lucas M. Bachmann, Michael A. Thiel, Martin K. Schmid   +8 more
wiley   +1 more source

Multivariate Regression Analysis to Predict Postoperative Refractive Astigmatism in Cataract Surgery

Journal of Ophthalmology, 2020
Purpose. To assess the correlation between postoperative refractive astigmatism and preoperative parameters in cataract surgery. Methods. Left eyes of 100 consecutive patients scheduled for cataract surgery with a 2.4 mm clear corneal incision were ...
Atsushi Kawahara, Tatsuhiko Sato, Ken Hayashi   +2 more
doaj   +1 more source

A comparative study of preoperative and postoperative changes in corneal astigmatism after pterygium excision by different techniques

Indian Journal of Ophthalmology, 2019
Purpose: To study the changes in corneal astigmatism before and after pterygium excision as well as with differences between various surgical techniques (bare sclera, conjunctival autograft, amniotic membrane graft).
Pragya Garg, A. Sahai, Mohd.Abid Shamshad, Lokendra Tyagi, Yamini Singhal, Shalini Gupta   +5 more
semanticscholar   +1 more source

Advances in the genetics of refractive errors: Contributions from the CREAM consortium

Acta Ophthalmologica, EarlyView.
Abstract The Consortium for Refractive Error and Myopia (CREAM) was established in 2011, bringing together an international team of researchers studying more than 30 cohorts. Since its establishment, CREAM has played a pivotal role in research investigating the genetics of myopia and other refractive errors, serving as a key driver of progress in the ...
Sze Wai Rosa Li, Xi He, Louise Terry, Virginie J. M. Verhoeven, Samantha Sze‐Yee Lee, Gareth Lingham, Jeremy A. Guggenheim, David A. Mackey, Seang‐Mei Saw, Caroline C. W. Klaver, Chi Pui Pang, CREAM Consortium   +11 more
wiley   +1 more source

Corneal power modelling with OCT data – Thin and thick lens paraxial models versus raytracing

Acta Ophthalmologica, EarlyView.
Abstract Background Evaluating keratometric power with Zeiss index (PKZ), paraxial thick cornea power (Gullstrand [PG]) and power referenced to the front (PFV) and back vertex plane (PBV) and raytracing power (PR), and modelling the deviation from PKZ with a multivariable linear prediction model.
Achim Langenbucher, Nóra Szentmáry, Alan Cayless, Peter Hoffmann, Jascha Wendelstein   +4 more
wiley   +1 more source

Concave grating spectrometer Patent [PDF]

, 1966
Concave grating spectrometer for use in near and vacuum ultraviolet ...
Murty, M. V. R. K.
core   +1 more source