Results 91 to 100 of about 88,327 (313)
Effect of astigmatism and spherical equivalent correction on contrast sensitivity [PDF]
International Journal of OphthalmologyAIM: To investigate the effect of astigmatism and spherical equivalent (SE) correction on contrast sensitivity (CS). METHODS: In this cross-sectional study, 103 visually normal subjects aged 18 to 36y with bilateral regular astigmatism in range of 1.00 ...
Maryam Saffarizadeh +3 more
doaj +1 more source
Ritchey-Chretien Telescope [PDF]
, 1973 A Ritchey-Chretien telescope is described which was designed to respond to images located off the optical axis by using two transparent flat plates positioned in the ray path of the image.
Amon, M., Rosin, S.
core +1 more source
Some Observation on Astigmatism [PDF]
Southern Medical Journal, 1919 Remarks on the terminology of astigmatism especially direct and inverse, and on the frequency of the latter, with discussion of practical points in dealing with astigmatism. With three charts. Read before the American Academy of Ophthalmology and Oto-Laryngology, August 6th, 1918.
Green, John, Hardy, William F.
openaire +5 more sources
Severe Nerve Enlargement in SOS2‐Related Noonan Syndrome
American Journal of Medical Genetics Part A, EarlyView.ABSTRACT Noonan syndrome is a genetic multisystem congenital disorder, caused by pathogenic variants in genes that encode components of the RAS/MAPK signaling pathway. Pathogenic variants in SOS2 represent less than 2% of cases with NS. The phenotype includes a particularly high prevalence (65%) of lymphatic disease. Recently, severe nerve enlargements
Erika Leenders +11 more
wiley +1 more source
Asynchronous Phase Shifts are Effective for Interferometric Single‐Molecule Localization Microscopy
Laser &Photonics Reviews, EarlyView.While interferometric Single‐Molecule Localization Microscopy (iSMLM) is well established to provide ultra‐high 3D precision, highly complex optical instrumentations are conventionally required for simultaneous multi‐phase interferometry. Here it is demonstrated that simultaneous multi‐phase interferometry is not essential for achieving ultra‐high ...
Zengxin Huang +4 more
wiley +1 more source
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 +5 more
semanticscholar +1 more source
Journal of Synchrotron Radiation, EarlyView.Theoretical background, optical design, experimental test results, and numerical simulations of the high‐luminosity meV‐resolution single‐shot hard X‐ray spectrograph for spectral diagnostics of cavity‐based X‐ray free‐electron lasers are presented.Cavity‐based X‐ray free‐electron lasers (CBXFELs) represent a possible realization of fully coherent hard
Keshab Kauchha +3 more
wiley +1 more source
Clinical Ophthalmology, 2017 Manoj Motwani Motwani LASIK Institute, San Diego, CA, USA Purpose: To show how an incorrect manifest astigmatism axis can cause an abnormal induced astigmatism on a new axis. Patients and methods: Four eyes of three patients were treated primarily with
Motwani M
doaj
Astigmatism and vision: should all astigmatism always be corrected? [PDF]
British Journal of Ophthalmology, 2013 As technology and medical devices improve, there is much interest in when and how astigmatism should be corrected with refractive surgery. Astigmatism can be corrected by most forms of refractive surgery, such as using excimer lasers algorithms to ablate the cornea to compensate for the magnitude of refractive error in different meridians.
James S. Wolffsohn +2 more
openaire +3 more sources
Clinical Ophthalmology, 2019 Purpose To assess the efficacy of five calculators for toric intraocular lenses (IOL). Methods Retrospective comparative case series in cataract patients undergoing implantation of trifocal toric IOLs (PhysIOL FineVision POD FT).
F. Ribeiro +4 more
semanticscholar +1 more source