Search results for "multifocal"

Co-Localización de Neuroimágenes del Electro-Retinograma Multifocal y Tomografía de Coherencia Óptica en las Distrofias Retinianas

2017

PROPÓSITO.- Las enfermedades de la retina constituyen una de las causas más importantes de pérdida de la visión y de la calidad de vida relacionada con la visión, en todo el mundo. Tanto la tomografía de coherencia óptica (OCT) como el electrorretinograma multifocal (ERGmf) son muy útiles para detectar las distrofias retinianas en estadios precoces cuando los cambios funduscópicos son sutiles y no se puede alcanzar un diagnóstico. Nos planteamos este proyecto de Tesis Doctoral para realizar un análisis multimodal de las imágenes y los datos obtenidos del examen mediante OCT y ERGmf con la exploración del fondo de ojo y la agudeza visual mejor corregida con el fin de optimizar el diagnóstico…

Ophthalmic: Laboratorio virtual para el diseño de nuevas lentes oftálmicas

2013

This work presents a new virtual laboratory, OPHTALMIC, developed with MATLAB GUI for using in Optics and Optometry courses as a computer tool for studying the focusing properties of multifocal diffractive both on unconventional structures both periodic and aperiodic. This virtual laboratory enables students to quickly and easily analyze the influence of the different parameters of construction and find the best solution for a user.

Studio clinico randomizzato e controllato sull'efficacia clinica dell'uso di lenti multifocali refrattive versus diffrattive nella chirurgia della ca…

2006

Le incisioni rilassanti limbari per la correzione dell'astigmatismo nei soggetti con impianto di IOL multifocali

2004

Visual and optical performance with hybrid multifocal intraocular lenses

2010

During the past years, the wish to become independent of spectacles has been growing among cataract and presbyopic patients due to many factors, such as the increase in near visual demands, the aesthetic need for a spectacle-free image and ageing of refractive surgery patients, among others. This review assesses recently published studies that analyse visual and optical performance through different metrics of eyes implanted with multifocal intraocular lenses (IOLs), particularly hybrid IOL designs. The published evidence suggests that hybrid multifocal IOLs provide very good outcomes in a number of visual and optical performance parameters. Patients implanted with this type of IOL obtain a…

Femtosecond laser for residual refractive error correction after refractive lens exchange with multifocal intraocular lens implantation.

2008

Purpose To assess visual and refractive outcomes of femtosecond laser for residual refractive error correction after refractive lens exchange (RLE) with multifocal intraocular lens (IOL) implantation. Design Prospective, nonrandomized, masked observational case series (self-controlled). Methods Fifty-three eyes of 31 consecutive patients were submitted to femtosecond laser surgery after RLE with multifocal IOL implantation. Patients showed an average manifest refractive error (D) of M , 0.200 ± 0.490; J 0 , −0.051 ± 0.532; and J 45 , −0.007 ± 0.371. Visual acuity (VA) was measured at distance and near vision before and six months after the surgery. Results At six months after surgery, mean …

MULTIFOCAL ATHEROSCLEROSIS INFLUENCING THE OUTCOME OF PATIENTS WITH ACUTE AND CHRONIC CORONARY HEART DISEASE

2007

MULTIFOCAL ATHEROSCLEROSIS INFLUENCING THE OUTCOME OF PATIENTS WITH ACUTE AND CHRONIC CORONARY HEART DISEASE

DIAGNOSTIC APPROACH TO THE PATIENTS WITH SUSPICION OF MULTIFOCAL DISEASE

2005

Influence of trifocal intraocular lenses on standard autorefraction and aberrometer-based autorefraction.

2019

To study the agreement between manifest refraction and objective refraction measured with two autorefractor models and an aberrometer in eyes implanted with a trifocal diffractive intraocular lens (IOL).IOA Madrid Innova Ocular, Madrid, Spain.Prospective comparative cohort study.An autorefractor keratometer (KR-8800), based on a Scheiner double pinhole, and a 3-dimension wavefront topography aberrometer system (OPD-Scan III), based on the scanning-slit retinoscopy principle, were used to obtain objective refraction readings. In addition, lower-order Zernike coefficients (Z) were used to calculate objective refraction. A set of 7 different results was obtained in power vector notation (spher…

Variable impact on mortality of AIDS-defining events diagnosed during combination antiretroviral therapy : not all AIDS-defining conditions are creat…

2009

Contains fulltext : 80963.pdf (Publisher’s version ) (Open Access) BACKGROUND: The extent to which mortality differs following individual acquired immunodeficiency syndrome (AIDS)-defining events (ADEs) has not been assessed among patients initiating combination antiretroviral therapy. METHODS: We analyzed data from 31,620 patients with no prior ADEs who started combination antiretroviral therapy. Cox proportional hazards models were used to estimate mortality hazard ratios for each ADE that occurred in >50 patients, after stratification by cohort and adjustment for sex, HIV transmission group, number of antiretroviral drugs initiated, regimen, age, date of starting combination antiretrovir…