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Livro de resumos CIOCV'2014

Wavefront optics and retinal image quality

With the increasing importance of optical aberrations in both vision research and clinical practice, it becomes necessary for vision scientists to have a thorough understanding of the concepts behind wavefront optics. Therefore, in this review, we provide some basic wave optics concepts useful to understand wavefront analysis, and describe the application of Zernike polynomials in the decomposition of aberratio...

Optics and children

Light and Optics are subjects that “naturally” attracts the interest and sympathy of children even from very early ages. In this communication, we present a serie of experiments and support material designed in this hands-on perspective, to be used to introduce the study of light and optics to kindergarten and early basic school students. Our hands-on investigative approach leads the students, aged 4 to 10 year...

Surface charaterization of soft contact lenses by atomic force microscopy

The aim of this study is to analyze surface properties of different hydrogel and silicone-hydrogel contact lenses (CL) using Atomic Force Microscopy (AFM) Several commercial CL prepared by the same method of manufacture (cast-moulding), with different monomers composition, water content and surface treatment were used in this study. Surface roughness analysis was performed using AFM on Tapping® Mode using st...

Tear film stability and immunoglobulin a variation during the day

Tear film stability and immunoglobulin A variation during the day A. Puinhas1, M. Lira1, S Franco1 and M P Sampaio2 1.Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. 2. Centre of Molecular and environmental Biology (CBMA), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. . Currently, there are more than 100 million contact lenses (CL) wearers worldwi...

Relationship between ergonomic parameters and ocular symptoms among computer users

Photorefraction images analysis through neural networks

The importance of an early evaluation of infants’ visual system condition is long time recognized. Non-corrected visual disorders may lead to major vision and developmental non-reversible limitations in the future. Among the objective methods of refraction, photorefractive techniques are specifically designed for screening young children. Over the years a number of photorefraction systems with different grades ...

Corneal imaging with slit-scanning and scheimpflug imaging techniques

Modern anterior segment imaging techniques, such as slit-scanning and Scheimpflug imaging, greatly improved the field of corneal imaging. Devices such as the Orbscan (Bausch & Lomb Surgical, Inc) and, more recently, the Pentacam (Oculus, Inc) and the Galilei (Ziemer Ophthalmic Systems AG) have brought a whole new range of clinical possibilities and sparked interest in the academic community. These new tomograph...

Crystalline lens imaging with a slit-scanning system

Determinação óptica da estrutura tridimensional da córnea

Tese de doutoramento em Ciências. ; O conhecimento da topografia da córnea assim como da sua espessura tem inúmeras aplicações tais como a cirurgia ocular, o diagnóstico e tratamento de várias condições patológicas da córnea, a adaptação de lentes de contacto, a elaboração de modelos teóricos do olho, etc.. Tendo em conta a importância da determinação destes parâmetros, este trabalho teve como objectivo o dese...