نتایج جستجو برای: astigmatic keratotomy

تعداد نتایج: 867  

Journal: :Journal of refractive surgery 1997
V Thompson

To the Editor: Radial keratotomy (RK) can be effective in reducing low to moderate amounts of myopia. Occasionally, a patient will “under-respond” to the RK procedure and be left with significant residual myopia. The refractive surgeon may then be presented with a situation where the patient desires more myopic reduction, but the surgeon does not want to perform another RK (for fear of inducing...

Journal: :Japanese journal of ophthalmology 1997
H Er B Mizrak

The aim of the present study was to compare conventional radial keratotomy (RK) with minimally invasive RK (mini-RK) in terms of achieved incisional depth as well as the histopathologic changes in the rabbit corneal structures. Four conventional RK incisions were performed on the right eye and four mini-RK incisions were performed on the left eye of 12 Island rabbits using a centripetal cutting...

2013
Tukezban Huseynova Tomomi Kanamori George O Waring Minoru Tomita

This paper describes the 3-month results of two patients who underwent KAMRA™ (AcuFocus, Inc, Irvine, CA, USA) inlay implantation surgery with a history of prior radial keratotomy. The refractive error just before KAMRA inlay implantation was corrected in one patient with a laser-assisted in situ keratomileusis (LASIK) procedure. The post-inlay implantation surgery results showed effective unco...

Journal: :THE JOURNAL OF JAPAN SOCIETY FOR LASER SURGERY AND MEDICINE 1991

Journal: :Journal of the Optical Society of America. A, Optics, image science, and vision 1998
R Kusel U Oechsner W Wesemann S Russlies E M Irmer B Rassow

We try to improve the accuracy of eccentric photorefraction by taking more information into account than just the size and tilt of the crescent. Based on Gaussian optics and the assumption of an isotropic scattering retina, a theoretical analysis of the light-intensity distribution in the pupils of astigmatic eyes is presented. The method is applied to different photorefractor setups (point lig...

2017
Helen H. L. Chan Yu Xiang G. Kong

Background The refractive outcomes of glaucoma surgeries, particularly their effect on astigmatism, are incompletely understood. Main body Trabeculectomy is associated with a considerable amount of with-the-rule astigmatic change in the immediate postoperative period. This is followed by a gradual against-the-rule shift. These changes are altered with the use of mitomycin C (MMC). Non-penetra...

Journal: :African Vision and Eye Health 2013

Journal: :Investigative ophthalmology & visual science 1991
H E Bedell D S Loshin

The authors assessed relationships between visual acuity and the amplitude, frequency, intensity, and duration of foveation periods in a retrospective study of 32 patients. Twenty-four patients had congenital idiopathic nystagmus, and eight patients had nystagmus and albinism. Visual acuity was determined for Landolt ring optotypes and, as the extrapolated high-frequency cutoff of the contrast ...

2006
Nam Ju Moon Hyeon Il Lee Jae Chan Kim

To determine if the involuntary contractions of eyelids may have any effects on the development of corneal astigmatism, we performed this prospective study which includes 19 patients with either essential blepharospasm or hemifacial spasm. In hemifacial spasm, the degree of corneal astigmatism was evaluated between two eyes. Then the topographic changes were checked using vector analysis techni...

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