Results 21 to 30 of about 88,327 (313)
Effect of the posterior corneal surface on total corneal astigmatism in patients with age-related cataract [PDF]
International Journal of Ophthalmology, 2018 AIM: To explore the effect of the posterior astigmatism on total corneal astigmatism and evaluate the error caused by substituting the corneal astigmatism of the simulated keratometriy (simulated K) for the total corneal astigmatism in age-related ...
Ying-Ying Jin +4 more
doaj +1 more source
A Reciprocal Transformation for the Constant Astigmatism Equation [PDF]
, 2014 We introduce a nonlocal transformation to generate exact solutions of the constant astigmatism equation $z_{yy} + (1/z)_{xx} + 2 = 0$. The transformation is related to the special case of the famous B\"acklund transformation of the sine-Gordon equation ...
Hlaváč, Adam, Marvan, Michal
core +1 more source
Distribution of posterior corneal astigmatism according to axis orientation of anterior corneal astigmatism. [PDF]
PLoS ONE, 2015 To investigate the distribution of posterior corneal astigmatism in eyes with with-the-rule (WTR) and against-the-rule (ATR) anterior corneal astigmatism.We retrospectively examined six hundred eight eyes of 608 healthy subjects (275 men and 333 women ...
Toshiyuki Miyake +2 more
doaj +1 more source
Femtosecond Laser-Assisted In Situ Keratomileusis Treatment of Residual Refractive Error following Femtosecond Laser-Enabled Keratoplasty. [PDF]
, 2019 Purpose:To evaluate the safety and effectiveness of femtosecond laser-assisted in situ keratomileusis (LASIK) in the treatment of residual myopia and astigmatism following femtosecond laser-enabled keratoplasty (FLEK).
Farid, Marjan +4 more
core +1 more source
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 +4 more
semanticscholar +1 more source
BMC Ophthalmology, 2020 Background To elucidate whether eyelid squinting improves near and distance vision in against-the-rule (ATR) and with-the-rule (WTR) simple myopic astigmatism in pseudophakic eyes. Methods A refraction-model eye was mounted on a wavefront analyzer.
Jay Won Rhim +5 more
doaj +1 more source
Clinical Ophthalmology, 2020 Purpose This study aimed to assess the effects of thermal pulsation system (TPS) treatment on astigmatism management in meibomian gland dysfunction (MGD) patients undergoing cataract surgery.
C. Matossian
semanticscholar +1 more source
Holographic aberration correction: optimising the stiffness of an optical trap deep in the sample [PDF]
, 2011 We investigate the effects of 1st order spherical aberration and defocus upon the stiffness of an optical trap tens of μm into the sample. We control both these aberrations with a spatial light modulator. The key to maintain optimum trap stiffness over a
Bowman +22 more
core +1 more source
International Journal of Environmental Research and Public Health, 2020 Screen media usage has become increasingly prevalent in daily life with children being exposed to screens at an early age. This is a growing public health concern with evidence linking screen exposure to detrimental health outcomes, whereas relationship ...
Lihua Huang +7 more
semanticscholar +1 more source