Results 51 to 60 of about 400,914 (301)

Repeatability of anterior segment measurements by optical coherence tomography combined with Placido disk corneal topography in eyes with keratoconus

Scientific Reports, 2020
Corneal tomography is an important tool to identify and follow up eyes with keratoconus. Our study evaluate the repeatability of the automatic measurements provided in keratoconic eyes by a new anterior-segment optical coherence tomographer (AS-OCT ...
Domenico Schiano-Lomoriello, V. Bono, I. Abicca, G. Savini   +3 more
semanticscholar   +1 more source

Curvature sensor for the measurement of the static corneal topography and the dynamic tear film topography in the human eye [PDF]

, 2005
A system to measure the topography of the first optical surface of the human eye noninvasively by using a curvature sensor is described. The static corneal topography and the dynamic topography of the tear film can both be measured, and the topographies ...
Gruppetta, S., Koechlin, L., Lacombe, F., Puget, P.   +3 more
core   +3 more sources

Reproducibility, and repeatability of corneal topography measured by Revo NX, Galilei G6 and Casia 2 in normal eyes

PLoS ONE, 2020
Purpose To test the repeatability and reproducibility of the topography module in posterior segment spectral domain optical coherence tomography with Revo NX (new device) and to compare keratometry values obtained by a Scheimpflug tomography (Galilei G6)
A. Wylęgała, R. Mazur, Bartłomiej Bolek, E. Wylęgała   +3 more
semanticscholar   +1 more source

Forward ray tracing for image projection prediction and surface reconstruction in the evaluation of corneal topography systems [PDF]

, 2010
A forward ray tracing (FRT) model is presented to determine the exact image projection in a general corneal topography system. Consequently, the skew ray error in Placido-based topography is demonstrated.
Amanatides, Applegate, Bauer, Boy Braaf, Braaf, Carvalho, Carvalho, Doss, Erik A. Hermans, Halstead, Joris J. Snellenburg, Klein, Klein, Klein, Lu, Marcos, Massig, Mattioli, Mejía, Muftuoglu, Rand, Rob G. L. van der Heijde, Salmon, Sicam, Sicam, Sicam, Sokurenko, Swartz, Thibos, Tripoli, Turuwhenua, Turuwhenua, Victor Arni D. P. Sicam, Vos, Wang   +34 more
core   +2 more sources

Comparison of Corneal Parameters of Children with Diabetes Mellitus and Healthy Children

Journal of Ophthalmology, 2019
Purpose. To compare differences in central corneal thickness (CCT), corneal curvature, and other corneal measurements of children with diabetes mellitus (DM) and healthy children, and to investigate related factors. Methods. This was a case-control study.
Shanshan Wang, Yan Jia, Tao Li, Anken Wang, Lu Gao, Chenhao Yang, Haidong Zou   +6 more
doaj   +1 more source

Hydroxyapatite promotes superior adhesion and proliferation of telomerase transformed keratocytes in comparison with inert plastic skirt materials used in leading contemporary keratoprostheses [PDF]

, 2005
Aim: Published clinical series suggest the osteoodontokeratoprosthesis (OOKP) may have a lower extrusion rate than current synthetic keratoprostheses. The OOKP is anchored in the eye wall by autologous tooth.
Allen, B.D.S., Faragher, R.G.A.F., Futter, C., Hing, K.A., Mehta, J., Sandeman, S.R., Tanner, K.E.   +6 more
core   +2 more sources

Influence of overnight orthokeratology lens fitting decentration on corneal topography reshaping

Eye and Vision, 2018
BackgroundThis retrospective study was designed to investigate the sole influence of orthokeratology (OK) lens fitting decentration on the Zernike coefficients of the reshaped anterior corneal surface.MethodsThis study comprised a review of 106 right ...
Jiaojie Chen, Wei Huang, Rong Zhu, Jun Jiang, Yiyu Li   +4 more
semanticscholar   +1 more source

A Fractal Approach to Nonlinear Topographical Features of Healthy and Keratoconus Corneas Pre- and Post-Operation of Intracorneal Implants

Fractal and Fractional, 2022
Fractal dimension (FD) together with advances in imaging technologies has provided an increasing application of digital images to interpret biological phenomena.
Shima Bahramizadeh-Sajadi, Hamid Reza Katoozian, Mahtab Mehrabbeik, Alireza Baradaran-Rafii, Khosrow Jadidi, Sajad Jafari   +5 more
doaj   +1 more source

Placido-based indices of corneal irregularity [PDF]

, 2011
Purpose: To construct a set of metrics computed from the raw keratoscopic data collected by any Placido corneal topographer. These indices that measure the irregularity of the anterior corneal surface are computed directly from the image of the mires ...
Ramos López, Darío
core   +1 more source

Corneal Pachymetric Topography

Ophthalmology, 1994
The authors developed a system for producing topographic pachymetric maps of the corneal epithelium and anterior scar tissue.The system uses high-frequency ultrasound scanning enhanced by digital signal processing. Ultrasonic echo data from consecutive parallel B-scans of the cornea spaced at 250-microns intervals are digitized and stored.
Stephen L. Trokel, Ronald H. Silverman, D. Jackson Coleman, Dan Z. Reinstein   +3 more
openaire   +3 more sources