Results 131 to 140 of about 17,272 (178)
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Astigmatism after corneal thermal injury
Journal of Cataract and Refractive Surgery, 2001A 42-year-old woman developed significant astigmatism after localized thermal injury to the cornea during a cosmetic eyelid procedure. The induced astigmatism regressed substantially over the ensuing months. One year after the injury, astigmatic keratotomy (AK) was performed, further reducing the astigmatism and improving the patient's subjective ...
B, Chou, B S, Boxer Wachler
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Acta Ophthalmologica Scandinavica, 1995
ABSTRACT The results of transverse or combined transverse and radial keratotomy in eyes with idiopathic corneal astigmatism (N = 11), astigmatism + myopia (N = 9) or early stages of keratoconus (N = 6) are presented. The corneal astigmatism was reduced in all our patients, the absolute reduction being significantly correlated to the degree of ...
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ABSTRACT The results of transverse or combined transverse and radial keratotomy in eyes with idiopathic corneal astigmatism (N = 11), astigmatism + myopia (N = 9) or early stages of keratoconus (N = 6) are presented. The corneal astigmatism was reduced in all our patients, the absolute reduction being significantly correlated to the degree of ...
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Corneal Astigmatism from Conjunctival Cysts
American Journal of Ophthalmology, 1982Two patients had decreasing visual acuity because of corneal astigmatism induced by a conjunctival cyst. In both cases, surgical removal of the cyst resulted in marked improvement because of a reduction in astigmatism. In one case, the cause of decreased visual acuity was unknown for two years; keratometry and a careful examination of the eyelids ...
H K, Soong, R T, Oyakawa, N T, Iliff
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Journal of Cataract and Refractive Surgery, 2014
To evaluate the influence of posterior corneal astigmatism on total corneal astigmatism in patients with 1.00 diopter (D) or more of corneal astigmatism.Private practice, Bologna, Italy.Prospective case series.Corneal astigmatism was measured using a Scheimpflug camera combined with a corneal topographer (Sirius).
Giacomo, Savini +4 more
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To evaluate the influence of posterior corneal astigmatism on total corneal astigmatism in patients with 1.00 diopter (D) or more of corneal astigmatism.Private practice, Bologna, Italy.Prospective case series.Corneal astigmatism was measured using a Scheimpflug camera combined with a corneal topographer (Sirius).
Giacomo, Savini +4 more
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Relations between refractive astigmatism and corneal astigmatism
Acta Ophthalmologica, 2010Abstract Purpose To investigate the relationship between refractive astigmatism and corneal (anterior and posterior) astigmatism in normal eyes. Methods We prospectively recorded refractive astigmatism and corneal astigmatism (Orbscan) of 500 healthy eyes (including ametropia) of 250 patients. Astigmatism data was analyzed using polar values (cylinder,
O TOUZEAU +5 more
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Posterior Corneal Surface Toricity and Total Corneal Astigmatism
Optometry and Vision Science, 1991The influence of posterior corneal surface toricity upon total corneal astigmatism was investigated in 60 young subjects (mean age 22.04 +/- 3.24 years). Both surfaces were found to be flatter horizontally than vertically. Astigmatism arising from the anterior corneal surface was therefore reduced by astigmatism of the opposite sign arising from the ...
M C, Dunne, J M, Royston, D A, Barnes
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Estimating Total Corneal Astigmatism From Anterior Corneal Data
Cornea, 2017Purpose: To determine keratometric astigmatism (KA), posterior corneal astigmatism (PCA), and total corneal astigmatism (TCA) in 951 normal eyes, to establish a model for estimating TCA from anterior corneal data, and to test this method in a new group of eyes with toric intraocular lenses (TIOLs).
Kristian, Næser +2 more
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A Longitudinal Study of Corneal Astigmatism and Total Astigmatism
Optometry and Vision Science, 1981Cross-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
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Corneal Topography and Irregular Astigmatism
Optometry and Vision Science, 1995The term irregular astigmatism has been used to refer to a variety of types of optical irregularity, although there are no widely recognized quantitative definitions of irregular astigmatism. This paper proposes a particular approach to defining and quantifying irregular astigmatism, and relates this model to blur disc formation.A model of irregular ...
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Influence of Posterior Corneal Astigmatism on Total Corneal Astigmatism in Eyes With Keratoconus
Cornea, 2016To measure posterior corneal astigmatism (PCA) and investigate its influence on total corneal astigmatism (TCA) in eyes with keratoconus.Keratometric astigmatism (KA), PCA, and TCA were investigated by means of a dual Scheimpflug analyzer in patients with keratoconus.
Giacomo, Savini +3 more
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