Results 61 to 70 of about 6,238 (208)

Corneal transplantation: Restoring sight to the blind

Acta Ophthalmologica, EarlyView.
Abstract Corneal blindness is one of the leading causes of vision loss worldwide. Transplantation of the cornea can restore vision and make blind patients see again. Corneal transplant surgery has undergone major evolution in recent decades with the advent of minimally invasive lamellar surgical approaches such as DMEK and DALK.
Claus Cursiefen
wiley   +1 more source

Corneal Aberrations in Keratoconus: A Pentacam Scheimpflug Imaging Study

Journal of Contemporary Medicine, 2021
Objective To investigate high-order corneal aberration alterations at different KC stages using a Pentacam Scheimpflug camera (OCULUS, Wetzlar, Germany), and to compare data with healthy eyes Materials and Methods This retrospective comparative study ...
Özgür Eroğul, Murat Kaşıkcı, Leyla Eryiğit Eroğul, Hamıdu Hamısı Gobeka   +3 more
doaj   +1 more source

Systematic investigation of methods for multiple freeform optimization in multi-lens imaging systems

, 2018
With the development in freeform technology, it has now become more and more feasible to use freeform surfaces in real system designs. While the freeform surfaces helping optical designers achieve more and more challenging system features, the methods ...
Gross, Herbert, Liu, Chang
core   +1 more source

Variation in measuring and ophthalmic factors correlating with central corneal thickness in the Northern Finland birth cohort eye study

Acta Ophthalmologica, EarlyView.
Abstract Purpose To assess the correlation between optical coherence tomography (OCT) and ultrasound pachymetry (USP) as methods for analysing central corneal thickness (CCT) and to evaluate ophthalmic factors affecting CCT. Methods The eyes of 3070 subjects of the Northern Finland Birth Cohort (NFBC) were examined at the age of 45–49 years.
Tuomas Qvist, Oona Ahokas, Johanna Liinamaa, Ville Saarela   +3 more
wiley   +1 more source

Enhancing ectasia screening using advanced AS-OCT: a case series of challenging refractive candidates

Frontiers in Ophthalmology
PurposeEctasia screening in candidates for laser refractive surgery is mandatory during preoperative evaluation. Despite the availability of modern imaging techniques, refractive surgeons often face borderline decisions when patients present with ...
Niklas Mohr, Stefan Kassumeh, Nikolaus Luft, Nikolaus Luft, Martin Dirisamer, Martin Dirisamer, Siegfried G. Priglinger, Wolfgang J. Mayer   +7 more
doaj   +1 more source

Reduced order modelling of air‐puff test for corneal material characterisation

Journal of Microscopy, EarlyView.
Abstract Models of the fluid–structure interaction (FSI) model for the air‐puff test were analysed. Using Abaqus, the air‐puff test is applied to eyes with varying biomechanical parameters, such as material properties, corneal thickness, and radius.
Osama M. Maklad, Muting Hao
wiley   +1 more source

Surgical approach affects intraocular lens decentration

Journal of the Formosan Medical Association, 2017
This study aims to quantify and identify risk factors for intraocular lens (IOL) tilt and decentration early after surgery using Scheimpflug imaging. Methods: We prospectively included 268 eyes of 253 patients who underwent uneventful cataract surgery ...
Pei-Yao Chang, Chi-Yang Lian, Jia-Kang Wang, Pei-Yuan Su, Jiun-Yi Wang, Shu-Wen Chang   +5 more
doaj   +1 more source

Defocusing digital particle image velocimetry and the three-dimensional characterization of two-phase flows [PDF]

, 2002
Defocusing digital particle image velocimetry (DDPIV) is the natural extension of planar PIV techniques to the third spatial dimension. In this paper we give details of the defocusing optical concept by which scalar and vector information can be ...
Gharib, Morteza, Pereira, Francisco
core   +1 more source

Reconstruction of deep and perforating corneal defects in dogs—A review (Part II/III): Biomaterials and keratoprosthesis

Veterinary Ophthalmology, Volume 28, Issue 2, Page 532-542, March 2025.
Abstract The surgical reconstruction of severe corneal ulcers is a common and crucial component of the clinical practice of veterinary ophthalmology. Numerous surgical techniques are used in dogs for corneal reconstruction, and these techniques may be categorized by the material used to repair the corneal lesion.
Eric C. Ledbetter, Rick F. Sanchez, Marta Leiva Repiso   +2 more
wiley   +1 more source

Complex descemet′s membrane tears and detachment during phacoemulsification

Journal of Ophthalmic & Vision Research, 2015
Purpose: To report a case of complex Descemet′s membrane detachment (DMD) and tears during phacoemulsification cataract surgery. Case Report: A 64-year-old woman underwent phacoemulsification surgery in her right eye and developed tears and partial loss
Faik Orucoglu, Ali Aksu
doaj   +1 more source