purpose : the aim of this study was to investigate the effect of misalignment (tilt & decentration) of iols in cataract surgery using liu-brennan optical eye model in a simulation. methods : a phantom with the real eye parameters –liu-brennan model– and tecnis z9000 iol were used for simulation. results : results showed that with 0.4 mm decentration and more the modulation transfer function (mt...

purpose: to evaluate the rate of optical coherence tomography (oct) grid decentration in a routine practice and its effect on thickness measurements methods: topcon spectral domain oct scans from various macular diseases including age related macular degeneration, diabetic macular edema, macular pucker and central serous chorioretinopathy (cscr) were studied in all patients visited during seven...

The composite insulator sheath plays an important role in protecting the core rod and insulation. thickness of must meet corresponding standard requirements. During manufacturing process, decentration leads to uneven sheath, which is easy cause risk insulators premature failure during operation. phased array detection technology can accurately detect so that defects such as (decentration rod) b...

Background This 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. Methods This study comprised a review of 106 right eyes and measurements of corneal topography both before OK and at 1-month follow-up visit. A routine was designed to calculate local corneal ...

Mengchan Sun Alberto de Castro Sergio Ortiz Pablo Perez-Merino Judith Birkenfeld Susana Marcos Instituto de Óptica “Daza de Valdés” Consejo Superior de Investigaciones Científicas Serrano 121 28006 Madrid, Spain E-mail: [email protected] Abstract. Measurement of intraocular lens (IOL) alignment implanted in patients in cataract surgery is important to understand their optical performance....

PURPOSE To evaluate intraocular lens (IOL) tilt and decentration by anterior segment optical coherence tomography (AS-OCT) using 3-dimensional (3D) reconstruction method. DESIGN Prospective observational case series. PARTICIPANTS Thirty-nine patients (39 eyes) were included. METHODS The IOL positions of all eyes were examined by AS-OCT. Images were obtained in 4 axes (0-180 degrees, 45-22...

The improved designs of intraocular lenses (IOLs) implanted during cataract surgery demand understanding of the possible effects of lens misalignment on optical performance. In this review, we describe the implementation, set-up and validation of two methods to measure in vivo tilt and decentration of IOLs, one based on Purkinje imaging and the other on Scheimpflug imaging. The Purkinje system ...

AIM To prospectively investigate changes in the area of the anterior capsule opening, and intraocular lens (IOL) decentration and tilt after implantation of a hydrogel IOL. METHODS 100 patients underwent implantation of a hydrogel IOL in one eye and an acrylic IOL implantation in the opposite eye. The area of the anterior capsule opening, and the degree of IOL decentration and tilt were measu...

We describe a patient with flap decentration after laser in situ keratomileusis (LASIK) and subsequent phakic toric intraocular lens (IOL) implantation. A 19-year-old man with mixed astigmatism had LASIK in the left eye complicated by flap decentration. Laser ablation was abandoned and implantation of a phakic toric IOL was done. Ten months after IOL implantation, the uncorrected visual acuity ...