OBJECTIVE To evaluate the first experience of phacoemulsification in Yemen from 2000-2007 regarding the visual results, and complications. METHODS Two hundred and fifty-eight eyes of 182 adult patients with significant cataract were included during the last 96 months. All eyes underwent phacoemulsification with implantation of intraocular lenses. The results were recorded and statistically an...

AIM To evaluate corneal topographic changes and surgically induced astigmatism (SIA) after combined phacoemulsification and 25-gauge transconjunctival sutureless vitrectomy (25-G TSV). METHODS A retrospective study on 96 eyes of 87 patients who underwent combined phacoemulsification and 25-G TSV. The different topographic parameters and SIA were analyzed pre- and postoperatively. RESULTS Th...

E yes with small pupils present a challenge to cataract surgeons. A pupil that fails to dilate can obscure visualization during all stages of phacoemulsification, making surgery more difficult and increasing the incidence of complications such as nucleus drop, vitreous prolapse, and iris tear. Inadequate pupil dilation is often seen in patients with a history of use of miotic agents, chronic uv...

In this paper, we describe waveguide properties of new optical waveguides made of noble metals and filled with glass and air. Such waveguides are coaxial cables and differ from a conventional coaxial in the shape of their central rods. Coaxial waveguide with annular and elliptic central rods are considered. Numerical simulations demonstrate that these waveguides, having nanosize cross-section, ...

Interactional aerodynamics has been studied for counter-rotating coaxial rotors in hover. The effects of torque balancing on the performance of coaxial-rotor systems have been investigated. The three-dimensional unsteady Navier-Stokes equations are solved on overset grids using high-order accurate schemes, dual-time stepping, and a hybrid turbulence model. Computational results for an experimen...

We theoretically investigate three-dimensional plasmonic waveguide-cavity structures, built by side-coupling stub resonators that consist of plasmonic coaxial waveguides of finite length, to a plasmonic coaxial waveguide. The resonators are terminated either in a short or an open circuit. We show that the properties of these waveguide-cavity systems can be accurately described using a single-mo...

background: complaining of tearing was found in some of our patients after phacoemulsification surgery for senile cataract. secondary acquired lacrimal drainage obstruction has been proposed to happen due to different causes. this study was performed at feiz hospital in isfahan, iran from september to december of 2004 to evaluate the effects of phacoemulsification surgery on tear drainage in ey...

A novel type of flexible [Fe3O4/PANI/PMMA]@{[Eu(BA)3phen + Tb(BA)3phen]/PMMA} (PMMA = polymethyl methacrylate, BA = benzoic acid, phen = phenanthroline, PANI = polyaniline) belt-shaped coaxial microcable possessing electrical conductivity, magnetism and color-tunable photoluminescence has been successfully fabricated by electrospinning technology using a specially designed coaxial spinneret. Ev...

Using a single interferometric lithography patterning step along with self-aligned pattern-definition techniques, uniform, large-area metallic coaxial arrays with ~ 100-nm toroidal gaps are fabricated. Enhanced (5x) mid-infrared (4 mum) transmission through these sub-wavelength coaxial arrays is observed as compared with that through the same fractional opening area hole arrays as a result of t...

Coaxial waveguides exhibit no dispersion and therefore can serve as an ideal channel for transmission of broadband THz pulses. Implementation of THz coaxial waveguide systems however requires THz beams with radially-polarized distribution. We demonstrate the launching of THz pulses into coaxial waveguides using the effect of THz pulse generation at semiconductor surfaces. We find that the radia...