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Evaluating keratometry and corneal astigmatism data from biometers and anterior segment tomographers and mapping to reconstructed corneal astigmatism [PDF]
Clinical and Experimental OphthalmologyBackground: To compare results from different corneal astigmatism measurement instruments; to reconstruct corneal astigmatism from the postimplantation spectacle refraction and toric intraocular lens (IOL) power; and to derive models for mapping measured
Leonardo Taroni +2 more
exaly +3 more sources
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Corneal Topographic Astigmatism (CorT) to Quantify Total Corneal Astigmatism
Journal of Refractive Surgery, 2015PURPOSE: To evaluate the performance of corneal topographic astigmatism (CorT) based on total corneal power measurements. METHODS: Anterior, posterior, and total corneal power measurements of 526 virgin eyes obtained using the CSO Sirius tomographer (Costuzione Strumenti Oftalmici ...
Noel, Alpins +2 more
openaire +2 more sources
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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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
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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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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 IN AMERIND CHILDREN
Optometry and Vision Science, 1972ABSTRACT Keratometer measurements were made on 230 unselected Indian children in Northern Saskatchewan and 323 unselected Caucasian children in Kitchener, Ontario. It was found that the Indian children had significantly higher mean corneal astigmatism than the Caucasian children.
W M, Lyle, T, Grosvenor, K C, Dean
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CHANGES IN CORNEAL ASTIGMATISM WITH AGE
Optometry and Vision Science, 1971ABSTRACT An analysis of the changes in corneal astigmatism over a mean period of 24.14 years was performed on data obtained by repeated keratometric measurements of the corneas of clinical patients.
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The Topography of Corneal Astigmatism
European journal of Implant and Refractive Surgery, 1994This article discusses the role of computerized videokeratoscopic topography in analysing corneal astigmatism. It describes and explains the normal topographical astigmatic patterns, an understanding of which is essential for the interpretation of corneal topographic maps.
David P.S. O'Brart +3 more
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Corneal Topography and Irregular Astigmatism
Optometry and Vision Science, 1995ABSTRACT Background. The 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
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