Results 61 to 70 of about 61,280 (177)

Polar Value Analysis of Low to Moderate Astigmatism with Wavefront-Guided Sub-Bowman Keratomileusis

Journal of Ophthalmology, 2017
Purpose. To evaluate the astigmatic outcomes of wavefront-guided sub-Bowman keratomileusis (WFG-SBK) for low to moderate myopic astigmatism. Methods. This study enrolled 100 right eyes from 100 patients who underwent WFG-SBK for the correction of myopia ...
Pisong Yan, Zhiyu Du, Yu Zhang
doaj   +1 more source

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

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

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

Collaborative development of diffraction-limited beamline optical systems at US DOE light sources [PDF]

, 2019
An ongoing collaboration among four US Department of Energy (DOE) National Laboratories has demonstrated key technology prototypes and software modeling tools required for new high-coherent flux beamline optical systems. New free electron laser (FEL) and
Assoufid, L, Bryant, D, Chao, W, Cocco, D, Goldberg, KA, Grizolli, W, Hardin, C, Huang, L, Idir, M, Kearney, SP, Lee, L, Morton, D, Ng, ML, Shi, X, Shu, D, Shvyd'Ko, Y, Wojcik, M, Wojdyla, A   +17 more
core  

Prevalence and profile of astigmatism in individuals availing ophthalmic services at Central Regional Referral Hospital, Gelephu, Bhutan: A cross-sectional, hospital-based study

Bhutan Health Journal
Introduction: Astigmatism has been defined as a type of refractive error when parallel rays of light entering the eye are not focused at one point of the retina when accommodation is at rest due to irregular curvature of the cornea or lens surface.
Sangay Choden, Tshering Jamtsho, Indra P Sharma   +2 more
doaj   +1 more source

Optimized laser turrets for minimum phase distortion [PDF]

, 1980
An analysis and computer program which optimizes laser turret geometry to obtain minimum phase distortion is described. Phase distortion due to compressible, inviscid flow over small perturbation laser turrets in subsonic or supersonic flow is calculated.
Blaisdell, G. A., Fuhs, A. E., Vanderplaats, G. N.   +2 more
core   +1 more source

Study of Objectives [PDF]

Focal length, chromatic and spherical aberration, and astigmatism testing for astronomical ...
Hartmann, J.
core   +1 more source

Comparison of astigmatism prediction error taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens implantation

BMC Ophthalmology, 2017
Background To evaluate and compare the astigmatism prediction errors taken with the Pentacam measurements, Baylor nomogram, and Barrett formula for toric intraocular lens (IOL) implantation.
Dae-Young Park, Dong Hui Lim, Sungsoon Hwang, Joo Hyun, Tae-Young Chung   +4 more
doaj   +1 more source

Low temperature optical testing of CFRP telescope panels [PDF]

Since 1984, low temperature optical tests were made of very lightweight mirror panels for use in balloon and space infrared and submillimeter telescopes. In order to accomplish this testing, an ambient pressure 0.5 meter test chamber operating from 20 to
Hoffmann, William F., Tysenn, Thomas, Woida, Patrick   +2 more
core   +1 more source