1. Articles from R. Lewis

    1-6 of 6
    1. New Non-invasive Techniques to Quantify Skin Surface Strain and Sub-surface Layer Deformation of Finger-pad during Sliding

      New Non-invasive Techniques to Quantify Skin Surface Strain and Sub-surface Layer Deformation of Finger-pad during Sliding

      tudies on the variation of skin properties with gender, age and anatomical region, with regards to interaction with different materials have resulted in significant research output. Investigations on skin surface strain and sub-surface layer deformation during sliding, however, have not received as much attention. This novel study uses two non-invasive techniques, optical coherence tomography (OCT) and digital image correlation (DIC), to measure properties of the index finger of a 25 year old female when under normal and shear loading. Measurements were taken during static, and for the first time, dynamic phases. It was observed that the number of ridges in ...

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    2. Measuring contact area in a sliding human finger-pad contact

      Measuring contact area in a sliding human finger-pad contact

      Background/Purpose The work outlined in this paper was aimed at achieving further understanding of skin frictional behaviour by investigating the contact area between human finger-pads and flat surfaces. Methods Both the static and the dynamic contact areas (in macro- and micro-scales) were measured using various techniques, including ink printing, optical coherence tomography (OCT) and Digital Image Correlation (DIC). Results In the studies of the static measurements using ink printing, the experimental results showed that the apparent and the real contact area increased with load following a piecewise linear correlation function for a finger-pad in contact with paper sheets. Comparisons ...

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    3. Investigation into surface interaction between the contact lens, the upper eyelid and cornea using optical coherence tomography

      Investigation into surface interaction between the contact lens, the upper eyelid and cornea using optical coherence tomography

      Background and Aim: Over 50% of the total 125 million contact lens users complain of discomforts due to contact lenses. The aim of the project is to understand the effect of contact lenses on the morphological parameters of cornea and eyelid surfaces. Methods and results: Five volunteers were recruited for this study (3 soft contact lens users and 2 non-users). The volunteers were imaged using a slit lamp and Optical Coherence Tomography (OCT) before and after a period of 6-7 hours. There was a significant increase in epidermal thickness of the eyelid for contact lens users compared to non-users. In ...

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    4. Characterizing the microcirculation of atopic dermatitis using angiographic optical coherence tomography

      Characterizing the microcirculation of atopic dermatitis using angiographic optical coherence tomography

      Background and Aim: With inflammatory skin conditions such as atopic dermatitis (AD), epidermal thickness is mediated by both pathological hyperplasia and atrophy such as that resulting from corticosteroid treatment. Such changes are likely to influence the depth and shape of the underlying microcirculation. Optical coherence tomography (OCT) provides a non-invasive view into the tissue, however structural measures of epidermal thickness are made challenging due to the lack of a delineated dermal-epidermal junction in AD patients. Instead, angiographic extensions to OCT may allow for direct measurement of vascular depth, potentially presenting a more robust method of estimating the degree of epidermal ...

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    5. Skin surface and sub-surface strain and deformation imaging using optical coherence tomography and digital image correlation

      Skin surface and sub-surface strain and deformation imaging using optical coherence tomography and digital image correlation

      Bio-mechanical properties of the human skin deformed by external forces at difference skin/material interfaces attract much attention in medical research. For instance, such properties are important design factors when one designs a healthcare device, i.e., the device might be applied directly at skin/device interfaces. In this paper, we investigated the bio-mechanical properties, i.e., surface strain, morphological changes of the skin layers, etc., of the human finger-pad and forearm skin as a function of applied pressure by utilizing two non-invasive techniques, i.e., optical coherence tomography (OCT) and digital image correlation (DIC). Skin deformation results of the ...

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    6. Feasibility of using Optical Coherence Tomography to Study the Influence of Skin Structure on Finger Friction

      Feasibility of using Optical Coherence Tomography to Study the Influence of Skin Structure on Finger Friction

      This paper presents work using an in-vivo technique, Optical Coherence Tomography (OCT), to investigate the structure of human finger pad skin and the influences of some related parameters on skin friction, such as contact area, deformation and hydration. The experimental results show that there was no significant relationship between the thickness of the stratum corneum (SC) and the friction coefficient, as well as the number of sweat ducts (SD). The real contact length was found to increase with increasing the applied normal force following the power law of A∝aW. The study of hydration found an increasing linear relationship between ...

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    1-6 of 6
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    Feasibility of using Optical Coherence Tomography to Study the Influence of Skin Structure on Finger Friction Skin surface and sub-surface strain and deformation imaging using optical coherence tomography and digital image correlation Characterizing the microcirculation of atopic dermatitis using angiographic optical coherence tomography Investigation into surface interaction between the contact lens, the upper eyelid and cornea using optical coherence tomography Measuring contact area in a sliding human finger-pad contact New Non-invasive Techniques to Quantify Skin Surface Strain and Sub-surface Layer Deformation of Finger-pad during Sliding ORCA study: real-world versus reading centre assessment of disease activity of neovascular age-related macular degeneration (nAMD) Role of visual evoked potentials and optical coherence tomography in the screening for optic pathway gliomas in patients with neurofibromatosis type I An assessment of the quality of optical coherence tomography image acquisition Optical coherence tomography evaluation of vertebrobasilar artery stenosis: case series and literature review Dispersion correction for optical coherence tomography by the stepped detection algorithm in the fractional Fourier domain Macular Optical Coherence Tomography Angiography in Nephropathic Patients with Diabetic Retinopathy in Iran: A Prospective Case–Control Study