background : phacoemulsification is one of the best surgical treatments for the cataract. secondary to the technicaladvances in estimating the intraocular lens (iol) power, the refractive errors, one of the most important surgical complications after surgery, is now reduced. currently, two methods of biometry are used to calculate the iol power, ultrasound biometry and optical biometry. both me...

Introduction: There is insufficient information about the correlation between hearing and visual impairments. Its importance arises when trainers should care about medical issues of their clients. Refractive errors of the eye are one of the main causes of visual loss in the society. The purpose of this study was to evaluate the relationship between refractive errors in the eye (by the type of r...

We report on the optical behaviour of a nanostructured diamond surface glass substrate. The numerical model reveals that simple geometrical pattern sustains Fano-like resonances with Q-factor as high 3.5 · 10 5 can be excited by plane waves impinging normally surface. show parameters nanopillars affect both resonant frequency and line shape. straightforwardly used refractive index sensor sensit...

purpose : to evaluate the correlation of central corneal thickness (cct) with refractive error and keratometry in a group of patients eligible for laser keratorefractive surgery, which may serve as a bias in studies on intraocular pressure (iop) measurement methods : in a cross sectional observational study, the right eyes of 340 patients who underwent laser keratorefractive surgery during the ...

We describe an exciting opportunity for Metal-Enhanced Fluorescence (MEF)-based surface assays using an angular-ratiometric approach to the observed enhanced emission from fluorophores in close proximity to silver colloids deposited on glass substrates. This approach utilizes the radiationless energy transfer (coupling) between the excited states of the fluorophore and the induced surface plasm...

PURPOSE Accommodation is a dioptric change in power of the crystalline lens resulting from ciliary muscle contraction that leads to an increase in lens surface curvatures and thickness and changes in the position of lens surfaces. Previous studies have used A-scan ultrasound to measure changes in the position of lens surfaces with voluntary accommodation, but have not simultaneously measured th...