Results 201 to 210 of about 42,051 (253)
Some of the next articles are maybe not open access.
Astigmatic keratotomy for post-keratoplasty astigmatism
Journal of Cataract and Refractive Surgery, 2006To assess astigmatic keratotomy as a means of managing post-keratoplasty astigmatism in the era of excimer laser refractive surgery.Moorfields Eye Hospital, London, England.Fifty paired arcuate keratotomies were performed with refractive and topographic guidance.
Tom R G, Poole, Linda A, Ficker
openaire +2 more sources
Science, 1978
Compared with children of school age, infants show ten times the incidence and considerably greater amounts of clinically significant astigmatism. The amount begins to decrease in the second semester of life, and the incidence declines during the third year. These unanticipated results bear on both the etiology and the neural sequelae of astigmatism.
I, Mohindra +3 more
openaire +2 more sources
Compared with children of school age, infants show ten times the incidence and considerably greater amounts of clinically significant astigmatism. The amount begins to decrease in the second semester of life, and the incidence declines during the third year. These unanticipated results bear on both the etiology and the neural sequelae of astigmatism.
I, Mohindra +3 more
openaire +2 more sources
Ophthalmic and Physiological Optics, 2000
Summary The 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 +2 more sources
Summary The 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 +2 more sources
Optometry and Vision Science, 1989
ABSTRACT 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.
N M, Sergienko, G D, Aliev
openaire +2 more sources
ABSTRACT 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.
N M, Sergienko, G D, Aliev
openaire +2 more sources
Journal of Statistical Physics, 2000
The main goal of this paper is to present some classes of chaotic high-dimensional billiards with all three types (focusing, dispersing and flat) components of the boundary. Moreover the author formulates the general approach to the construction of hyperbolic billiards in dimensions \(d\geq 3\) and to extend the notion of absolutely focusing mirrors to
openaire +1 more source
The main goal of this paper is to present some classes of chaotic high-dimensional billiards with all three types (focusing, dispersing and flat) components of the boundary. Moreover the author formulates the general approach to the construction of hyperbolic billiards in dimensions \(d\geq 3\) and to extend the notion of absolutely focusing mirrors to
openaire +1 more source
Optometry and Vision Science, 1978
ABSTRACT A large amount of evidence suggests that astigmatism is hereditary. Other evidence indicates that the prevalence of astigmatism varies widely between and within racial groups and that both the direction and the amount of astigmatism tend to vary as a function of age and in response to environmental influences.
openaire +2 more sources
ABSTRACT A large amount of evidence suggests that astigmatism is hereditary. Other evidence indicates that the prevalence of astigmatism varies widely between and within racial groups and that both the direction and the amount of astigmatism tend to vary as a function of age and in response to environmental influences.
openaire +2 more sources
Acta Ophthalmologica, 1982
The bundle of rays from the chamber angle will pass the posterior surface of the contact‐glass at a large angle. This will result in considerable astigmatism. Different methods to reduce or eliminate the astigmatism are discussed.
openaire +2 more sources
The bundle of rays from the chamber angle will pass the posterior surface of the contact‐glass at a large angle. This will result in considerable astigmatism. Different methods to reduce or eliminate the astigmatism are discussed.
openaire +2 more sources
Femtosecond laser astigmatic keratotomy for postkeratoplasty astigmatism
Canadian Journal of Ophthalmology, 2008Two eyes of 2 patients with high astigmatism following penetrating keratoplasty were treated with femtosecond laser-assisted paired arcuate keratotomies in the donor cornea. Outcome measures included best-corrected visual acuity, refraction, keratometry, and topographic findings.
Mona, Harissi-Dagher, Dimitri T, Azar
openaire +2 more sources
A Longitudinal Study of Corneal Astigmatism and Total Astigmatism
Optometry and Vision Science, 1981Abstract Cross‐sectional studies indicate that mean total astigmatism changes with age; varying from as much as 0.62 D with‐the‐rule during youth to as much as 0.37 D against‐the‐rule in samples of elderly patients. The present study involves the examination of adult patients who were seen regularly for a period of at least 40 years ...
W R, Baldwin, D, Mills
openaire +2 more sources
IntraLase-Enabled Astigmatic Keratotomy for Postkeratoplasty Astigmatism
American Journal of Ophthalmology, 2008To report on the outcomes of IntraLase-enabled astigmatic keratotomy (IEAK) and to compare it with manual astigmatic keratotomy (AK) for the management of postkeratoplasty astigmatism.Retrospective, comparative case series.Forty eyes of 39 patients treated at a cornea clinic at the Toronto Western Hospital were included. Twenty eyes underwent manual AK
Irit, Bahar +4 more
openaire +2 more sources