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Livro de resumos CIOCV'2014

Evaluation of optical properties of different types of contact lenses

The main objective of this work was to attain a deeper knowledge of contact lenses (CL) optical properties and to understand the influence of CL power on other properties which can affect the optical performance and compromise the ocular physiology.

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

Relationship between the stability and surface tension of the tear film

White light interferometry to characterize the hydrogel contact lens surface

Uncorrected proof ; Purpose: The aim of this study was to characterize, qualitatively and quantitatively, the surface morphology of four unworn conventional hydrogel contact lenses (Omafilcon, Hioxifilcon-based, Nefilcon A and Ocufilcon B) by White Light Optical Profiling (WLOP). WLOP is an ideal technique for sampling larger areas as well as for higher measurement speed compared with other topography techniqu...

The potential use of biosurfactants as contact lenses coating agents

The influence of lens material and lens wear on the removal and viability of st...

Purpose: The aim of this study was to evaluate the influence of lens material and lens wear on the removal capability of Staphylococcus epidermidis. Assessment of viability of remaining adhered bacteria was another goal of this work. Four silicone hydrogel materials (galyfilcon A, balafilcon A, lotrafilcon A, lotrafilcon B) and one conventional hydrogel material (etafilcon A) were assayed. Methods: Detachment s...