Agreement between Placido Disc, Scheimpflug, and Optical Coherence Tomography-Based Measurements of Corneal Topography in Healthy Myopic Individuals [PDF]
Journal of Current OphthalmologyPurpose: To evaluate the agreement between topographical and tomographic measurements of the cornea with three methods of Placido-disc, Scheimpflug, and optical coherence tomography in normal eyes with myopic refractive error candidate for keratorefractive surgery. Methods: Subjects
Siamak Zarei-Ghanavati +5 more
openaire +3 more sources
Keratoconus: imaging modalities and management. [PDF]
Med Hypothesis Discov Innov OphthalmolBackground: Keratoconus (KCN) is characterized by gradual thinning and steepening of the cornea, which can lead to significant vision problems owing to high astigmatism, corneal scarring, or even corneal perforation.
Alqudah N.
europepmc +3 more sources
Comparison of the reliability of corneal curvature and eccentricity measurements in myopic eyes using four different devices. [PDF]
Front Med (Lausanne)Myopia is a global public issue which is increasing worldwidely. Instruments are essential for measurement in the diagnosis and evaluation of myopia. Comparing the agreement of corneal curvature and eccentricity measurements obtained using four different
Qu D, Yu J, Zhou Y.
europepmc +3 more sources
Journal of the Korean Ophthalmological Society, 2023 Purpose: We compared corneal higher-order aberration (HOA) measurements between the Pentacam<sup>®</sup> HR (PC), which uses the Scheimpflug principle, and the iTrace<sup>TM</sup> aberrometer (IT), which evaluates Placido disc topography.Methods: We retrospectively analyzed 109 eyes of 87 patients without a history of ocular ...
Yeon Ju Lim +3 more
openaire +1 more source
Redes neurais e análise estatística para classificação de mapas topográficos da córnea baseados em coeficientes de Zernike: uma comparação quantitativa [PDF]
, 2008 PURPOSE: The main goal of this study was to develop and compare two different techniques for classification of specific types of corneal shapes when Zernike coefficients are used as inputs.
BARBOSA, Marconi Soares +1 more
core +3 more sources
Permutabilidade entre o disco de Plácido e o sistema Scheimpflug: análise quantitativa e qualitativa [PDF]
, 2010 PURPOSE: Many systems try to replace Placido disc-based topographers, such as those based in Scheimpflug principles. The purpose of this study is to check if they are interchangeable. METHODS: Quantitative analysis evaluated data obtained from EyeSys and
Mallmann, Felipe +3 more
core +3 more sources
Orbscan Evaluation of Corneal Power after Myopic PRK: Placido Disc-Based vs Scanning Slit Topography
Journal of Optometry, 2009 AbstractPurposeTo compare Placido disc-based and scanning slit topography in the evaluation of corneal power changes after PRK.MethodsThe changes in corneal power, evaluated with an Orbscan II utilizing both Placido disc-based and Scanning Slit topography, before and 1, 3 and 6 months after PRK were compared with refractive changes in 109 individuals ...
NICOLA ROSA +5 more
openaire +2 more sources
Biometry and Intraocular Lens Power Calculation by Combined Scheimpflug-Placido Disc versus Optical Interferometry Devices [PDF]
, 2022 Purpose: To compare the results of the current gold standard, laser interferometry, and keratometry by the IOL-Master, with a newly developed Galilei G6 using raytracing software Okulix for intraocular lens (IOL) power calculations.
Anne-Isabel, Lehman +5 more
core +2 more sources
Improving precision for detecting change in the shape of the cornea in patients with keratoconus [PDF]
, 2018 To investigate a method for precision analysis to discriminate true corneal change from measurement imprecision in keratoconus (KC). Thirty patients with KC and 30 healthy controls were included. Coefficients of repeatability and limits of agreement (LOA)
A Rio-Cristobal +25 more
core +3 more sources
Comparative analysis of some modeal reconstruction methods of the cornea from corneal elevation data [PDF]
, 2009 Purpose. A comparative study of the ability of some modal schemes to reproduce corneal shapes of varying complexity is performed, using both standard radial polynomials and the radial basis functions (RBF).
Alió, Jorge L. +4 more
core +2 more sources