Results 171 to 180 of about 13,094 (205)
Some of the next articles are maybe not open access.
Current Eye Research, 2012
To compare keratometry measurements obtained using an automated keratometer (AK, IOLMaster) and a Scheimpflug keratometer (Pentacam) in predicting residual astigmatism after cataract surgery.Preoperative corneal astigmatism was calculated using preoperative refraction, an AK and a Scheimpflug keratometer (anterior corneal power [ACP] and true net power
Choul, Yong Park +2 more
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To compare keratometry measurements obtained using an automated keratometer (AK, IOLMaster) and a Scheimpflug keratometer (Pentacam) in predicting residual astigmatism after cataract surgery.Preoperative corneal astigmatism was calculated using preoperative refraction, an AK and a Scheimpflug keratometer (anterior corneal power [ACP] and true net power
Choul, Yong Park +2 more
openaire +2 more sources
American Journal of Ophthalmology, 2023
To compare the utility of keratometry vs total keratometry (TK) for intraocular lens power calculations in eyes with keratoconus (KCN) using KCN and non-KCN formulae.Retrospective cohort study.This study was conducted at 2 academic centers and included 87 eyes in 67 patients who underwent cataract surgery between 2019 and 2021.
Michael T. Heath +8 more
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To compare the utility of keratometry vs total keratometry (TK) for intraocular lens power calculations in eyes with keratoconus (KCN) using KCN and non-KCN formulae.Retrospective cohort study.This study was conducted at 2 academic centers and included 87 eyes in 67 patients who underwent cataract surgery between 2019 and 2021.
Michael T. Heath +8 more
openaire +2 more sources
Comparison of three keratometry instruments
Journal of Cataract and Refractive Surgery, 1995We compared the reliability of measurements of three keratometers and keratometry readings from a corneal topography system to determine if they were as accurate as the "gold standard" Javal-Schiotz keratometer. Same-day measurement of the steepest and flattest powers of the central 3 mm of the corneas of 200 eyes (100 patients) revealed no ...
D G, Tennen, R H, Keates, C, Montoya
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Comparison of portable automated keratometry and manual keratometry for IOL calculation
Journal of Cataract and Refractive Surgery, 1997To compare the accuracy of portable automated keratometry (PAK) with that of manual keratometry (MK) in measuring corneal power for intraocular lens calculations.Wilford Hall Medical Center, San Antonio, Texas, USA.In Part 1 of the study, five ophthalmic technicians performed keratometric analysis in 20 eyes in 10 volunteers using both manual and ...
C A, Manning, P M, Kloess
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Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists), 1996
During conventional keratometry, the two principal meridia are identified and measurements of the anterior corneal curvature determined along these orientations. However, in cases of corneal irregularity, the principal meridia may be difficult to identify. Accordingly, the present study sought to evaluate two alternative procedures which do not require
M, Rosenfield, J K, Portello
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During conventional keratometry, the two principal meridia are identified and measurements of the anterior corneal curvature determined along these orientations. However, in cases of corneal irregularity, the principal meridia may be difficult to identify. Accordingly, the present study sought to evaluate two alternative procedures which do not require
M, Rosenfield, J K, Portello
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Keratometry in Epikeratophakia
Journal of Refractive Surgery, 1986ABSTRACT: In keratomileusis and radial keratotomy, keratometry does not accurately reflect the change in refraction produced by the surgery. The authors report that this also occurs in patients undergoing epikeratophakia. The keratometer underestimates the clinically observed changes in refractive error, and changes in keratometry ...
Robert C Arffa +2 more
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Applied Optical Principles: Keratometry
Ophthalmology, 1979The optical correction of the aphakic eye requires the addition of a significant amount of vergence power to the corneal interface by one of three modalities: spectacle, contact lens, or intraocular lens. No matter which modality is chosen, based upon Gullstrand's parameters, the corneal interface provides approximately 74% of the effective vergence ...
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Automated keratometry at low cost
IEEE Engineering in Medicine and Biology Magazine, 2000Describes an automatic optical system that is attached to a slit lamp in order to provide automatic keratometry at low cost. The system consists of projecting a light ring as a target onto the patient's cornea as well as analysis of the deformation of the target in order to obtain the radius of curvature and the axis of the associated astigmatism.
L, Ventura +3 more
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Journal of Refractive Surgery, 2018
PURPOSE: To compare “total keratometry” measurements with Goggin nomogram adjusted anterior keratometry (GNAK) for toric intraocular lens calculation. METHODS: Routine biometry provided measured total keratometry values from which astigmatism was derived.
LaHood, Benjamin R. +4 more
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PURPOSE: To compare “total keratometry” measurements with Goggin nomogram adjusted anterior keratometry (GNAK) for toric intraocular lens calculation. METHODS: Routine biometry provided measured total keratometry values from which astigmatism was derived.
LaHood, Benjamin R. +4 more
openaire +4 more sources
Graefe's Archive for Clinical and Experimental Ophthalmology
To investigate the effect of posterior keratometry (PK) on the accuracy of 10 intraocular lens (IOL) power calculation formulas using standard keratometry (K) and total keratometry (TK).This is a retrospective consecutive case-series study. The IOL power was calculated using K and TK measured by IOLMaster 700 in 6 new-generation formulas (Barrett ...
Aixia, Jin +9 more
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To investigate the effect of posterior keratometry (PK) on the accuracy of 10 intraocular lens (IOL) power calculation formulas using standard keratometry (K) and total keratometry (TK).This is a retrospective consecutive case-series study. The IOL power was calculated using K and TK measured by IOLMaster 700 in 6 new-generation formulas (Barrett ...
Aixia, Jin +9 more
openaire +2 more sources