نتایج جستجو برای: astigmatic keratotomy

تعداد نتایج: 867  

2015
Hyun Ju Park Hun Lee Young Jae Woo Eung Kweon Kim Kyoung Yul Seo Ha Yan Kim Tae-im Kim

PURPOSE To compare the astigmatic power of toric intraocular lenses (IOLs) obtained from the AcrySof, TECNIS, and iTrace toric calculator in patients with preoperative with-the-rule (WTR) or against-the-rule (ATR) corneal astigmatism. MATERIALS AND METHODS Fifty eyes with cataract and corneal astigmatism greater than 0.75 diopters were enrolled in each group (WTR and ATR). Keratometric values...

Journal: :The British journal of ophthalmology 1983
R Goel J Crewdson A H Chignell

Eighty-three patients on whom successful retinal detachment had been performed were studied to note astigmatic changes following surgery. In the majority of cases the errors following such surgery are of no great clinical importance. However, in some situations a high degree of astigmatism may be produced. This study showed that these sequelae are particularly likely after radial buckling proce...

Journal: :Journal of refractive surgery 2001
J Toczolowski P Oles Z Zagórski K U Szymona L Baltaziak B Rymgayllo-Jankowska

PURPOSE The study focuses on the problem of self-concept change in patients after radial keratotomy. METHODS Twenty-five patients (17 female, 8 male) were studied from 6 to 18 months after radial keratotomy using the Adjective Check List by Gough and Heilbrun with the application of double instruction. It concerned self-concept change over a period of observation after surgery, as compared to...

Journal: :Proceedings of the Physical Society of London 1902

Journal: :Survey of ophthalmology 1994
C G Tiemeier R L Abbott J H Ellis

In this article, reprinted from Ophthalmic Risk Management Digest, the bases for radial keratotomy-related claims and guidelines for avoiding such claims are discussed. In most lawsuits, it is not the procedure itself that is on trial, but the use of unusual technique, improper execution, or inadequacy of informed consent.

Journal: :Investigative ophthalmology & visual science 1989
R P Hemenger A Tomlinson P J Caroline

A technique is described to determine the change in image contrast as a result of the spherical aberration induced by the radial keratotomy procedure. The hypothesis that the loss in contrast sensitivity of the RK eye is due to the change in spherical aberration postsurgically, is found to be acceptable for some patients. However, this is not a sufficient explanation in all cases. This conclusi...

Journal: :Vision Research 1995
J.Ø. Hjortdal T. Bek

Purpose. To develop a mathematical tool for decomposition of comeal topographic data into comprehensive optical components. Methods. The polar data values arising from each mire of the TM>1 cornea1 topographer were separated into spherical (average power), regdar astigmatic (2’ harmonic), and non-regular astigmatic components (l’, 3’, and higher harmonics) by Fourier series analysis. Averages o...

Journal: :Applied optics 2013
Robert D Niederriter Juliet T Gopinath Mark E Siemens

We demonstrate motion-free beam quality M² measurements of stigmatic, simple astigmatic, and general astigmatic (twisted) beams using only a focus-tunable liquid lens and a CCD camera. We extend the variable-focus technique to the characterization of general astigmatic beams by measuring the 10 second-order moments of the power density distribution for the twisted beam produced by passage throu...

Journal: :Vision Research 1995
E. Leite A. Pedruco B. Oliveiros C. Gonçalves C. Lobo J. Mira

Purpose. To develop a mathematical tool for decomposition of comeal topographic data into comprehensive optical components. Methods. The polar data values arising from each mire of the TM>1 cornea1 topographer were separated into spherical (average power), regdar astigmatic (2’ harmonic), and non-regular astigmatic components (l’, 3’, and higher harmonics) by Fourier series analysis. Averages o...

Journal: :Vision Research 1995
C. Tavares E. Leite H. Azevedo A. Baltar L. Ribeiro J. M. Pereira

Purpose. To develop a mathematical tool for decomposition of comeal topographic data into comprehensive optical components. Methods. The polar data values arising from each mire of the TM>1 cornea1 topographer were separated into spherical (average power), regdar astigmatic (2’ harmonic), and non-regular astigmatic components (l’, 3’, and higher harmonics) by Fourier series analysis. Averages o...

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