Results 261 to 270 of about 93,210 (330)
Adaptive metalenses with simultaneous electrical control of focal length, astigmatism, and shift
Science Advances, 2018 Artificial muscle corrects metalens aberrations on the fly. Focal adjustment and zooming are universal features of cameras and advanced optical systems.
Alan She, Shuyan Zhang, Samuel Shian
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Astigmatism analysis and reporting of surgically induced astigmatism and prediction error
Journal of cataract and refractive surgery, 2022Purpose: To provide a method for determining the vector that, when added to the preoperative astigmatism, results in no prediction error (PE) and to specify statistical methods for evaluating astigmatism and determining the 95% confidence convex polygon.
J. Holladay, R. Wilcox, D. Koch, Li Wang
semanticscholar +1 more source
European Journal of Ophthalmology, 2022
Purpose To evaluate the refractive outcomes of small-incision lenticule extraction (SMILE) surgery in moderate to high myopic astigmatism Study Design Prospective interventional case series Methods This study evaluated 111 eyes of 68 patients treated ...
M. Jabbarvand +7 more
semanticscholar +1 more source
Purpose To evaluate the refractive outcomes of small-incision lenticule extraction (SMILE) surgery in moderate to high myopic astigmatism Study Design Prospective interventional case series Methods This study evaluated 111 eyes of 68 patients treated ...
M. Jabbarvand +7 more
semanticscholar +1 more source
Journal of refractive surgery, 2021
PURPOSE To compare refractive outcomes, higher order aberrations (HOAs), and the changes in contrast sensitivity after wavefront-guided femtosecond laser-assisted in situ keratomileusis (WFG LASIK) and optimized small incision lenticule extraction (SMILE)
Xinheng Zhao +6 more
semanticscholar +1 more source
PURPOSE To compare refractive outcomes, higher order aberrations (HOAs), and the changes in contrast sensitivity after wavefront-guided femtosecond laser-assisted in situ keratomileusis (WFG LASIK) and optimized small incision lenticule extraction (SMILE)
Xinheng Zhao +6 more
semanticscholar +1 more source
Astigmatism correction with toric implantable collamer lens in low and high astigmatism groups
European Journal of Ophthalmology, 2021Purpose: To analyze the target induced astigmatism (TIA), surgically induced astigmatism (SIA), difference vector (DV), and correction index (CI) in the correction of astigmatism with phakic lenses, and its influence on visual acuity, and to analyze the ...
A. Cano-Ortiz +6 more
semanticscholar +1 more source
Journal of cataract and refractive surgery, 2020
In pseudophakic patients, even low amounts of residual astigmatism can increase the odds of not achieving 20/20 or 20/16 uncorrected distance visual acuity.
S. Schallhorn +6 more
semanticscholar +1 more source
In pseudophakic patients, even low amounts of residual astigmatism can increase the odds of not achieving 20/20 or 20/16 uncorrected distance visual acuity.
S. Schallhorn +6 more
semanticscholar +1 more source
Optometry and Vision Science, 1989
Measurement of refraction in the principal meridians and off-axis meridians in both directions from the visual axis was undertaken. The extent of disagreement between the sine-squared law and the actual astigmatism of living astigmatic eyes was calculated. The corrected visual acuity correlates with the residual ametropia.
N M, Sergienko, G D, Aliev
openaire +2 more sources
Measurement of refraction in the principal meridians and off-axis meridians in both directions from the visual axis was undertaken. The extent of disagreement between the sine-squared law and the actual astigmatism of living astigmatic eyes was calculated. The corrected visual acuity correlates with the residual ametropia.
N M, Sergienko, G D, Aliev
openaire +2 more sources
Ophthalmic and Physiological Optics, 2000
SummaryThe quantitative representation and analysis of astigmatism present difficulties for the researcher. The case is made that the difficulties arise because of the way astigmatism is conceived and defined. In most cases astigmatism is regarded as cylinder.
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SummaryThe quantitative representation and analysis of astigmatism present difficulties for the researcher. The case is made that the difficulties arise because of the way astigmatism is conceived and defined. In most cases astigmatism is regarded as cylinder.
openaire +3 more sources