Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"tear film"”.
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The tear film and contact lens wear
… Blotting to study the protein profiles of tear samples. By studying the tears of non-contact lens wearers, it was possible to analyse what could be considered normal, healthy, individuals. A clinical study was also undertaken which followed a population of individuals from the neophyte …
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Tear film structure of the contact lens wearer
… thesis which allow the visual examination of the tear film on the cornea and on different types of contact lenses. The techniques are as follows: 1. A high magnification technique of photography using the biamtcroscope and crossed polartsed light, allows the measurement of tear film layer …
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Tear Film VEGF in Dogs with Vascularizing Corneal Disease
… two studies: the collection of canine tears via a novel polyester<br />rod and the comparison of VEGF-A concentrations in tears from dogs with normal and<br />vascularized corneas. The first study used polyester rods for tear collection in dogs. Fluid volume and VEGF recovery …
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Biochemical studies of the tear film in humans and rabbits
Clinically, a decrease in tear film stability has been associated with both dry eye and contact lens discontinuation. Rabbits are known to have a significantly longer inter-blink time compared to humans, perhaps due to their very stable tear film. The reason for this, however, has never been …
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Laser induced fluorescence measurement of the tear film thickness under a contact lens
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Changes in tear film biochemistry in end of day ocular discomfort with and without contact lenses
… in the evening. This work examined changes in tear film proteins and lipids, especially those previously associated with non-contact lens dry-eye or inflammation, for their diurnal variation and their association with comfort during CL wear. Comfort decreased at the end of the day, and this was …
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Effects of systemic flunixin meglumine, topical oxytetracycline, and topical prednisolone acetate on tear film proteinases innormal horses
… matrix metalloproteinase-9 (MMP-9), in equine tear film. The study design consisted of twelve ophthalmically normal horses separated into three groups of four in a cross-over study design. Each group was treated for 5 days with flunixin meglumine (500mg IM bid), topical 1% prednisolone acetate …
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Characterization of Ocular Surface Pathology and Tear Film Dysfunction Due to Type 1 and Type 2 Diabetes Mellitus
… ocular surface and its various components like tear film, goblet cells and glycocalyx, has not yet been investigated. These pathological changes can potentially cause dry eye and corneal injury including epithelial erosion, impaired wound healing and keratopathy. As the mainstay treatment option …
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Tear and skin phospholipids:analysis and hydrogel analogues
… with the analysis of phospholipids in the tear film and with the synthesis of phospholipids analogous to hydrogels. The work consists of two areas. The first area is the study of the phospholipids in the tear film, their nature and fate. The use of liquid chromatography mass spectrometry …
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Biochemical markers and contact lens wear
… the interactions between the composition of the tear film and of the biofilm deposited on the contact lenses and contact lens performance. The investigations were limited to studying the lipid components of the tear film; the lipid layer, which plays a key role in preventing evaporation and …
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The mechanics of a hydrogel contact lens on the human eye with a lubricating tear layer
… on a rigid eye with a lubricating viscoelastic tear layer. The mechanics of fit are described in terms of the pressure distribution through the tear layer, the contact pressure at the lens/tear interface, the tear film thickness, and the bending and membrane stresses in the contact lens itself. …
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ΔΡΑΣΕΙΣ ΤΩΝ ΓΛΥΚΟΚΟΡΤΙΚΟΕΙΔΩΝ ΣΤΟΥΣ ΝΕΥΡΩΝΕΣ ΤΟΥ Κ.Ν.Σ. ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΜΟΡΙΑΚΩΝ ΜΗΧΑΝΙΣΜΩΝ ΠΟΥ ΕΝΕΧΟΝΤΑΙ ΣΤΗΝ ΑΠΑΝΤΗΣΗ ΤΟΥ ΟΡΓΑΝΙΣΜΟΥ ΣΤΟ STRESS
THE STUDY IS ABOUT THE PRECORNEAL TEARS FILM AND THE CONJUNCTIVAL EPITHELIUM. WE STUDY THE INFLUENCE OF THE AGE, SEX, ENVIRONMENTAL FACTORS AND GENERAL DISEASES (CONNECTIVE TISSUES DISEASES, S. SJOGREN) ON THE LACRIMAL FUNCTION AND THE CONJUNCTIVAL EPITHELIUM. WE EXAMINED FIVE GROUPS: 276 NORMAL …
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Μεταβολές της προκερατίου δακρυϊκής στιβάδος και μελέτη του επιθηλίου του επιπεφυκότα με την μέθοδο του αποτυπώματος σε φυσιολογικά και ξηρά μάτια
The study is about the precorneal tears film and the conjunctival epithelium. We study the influence of the age, sex, environmental factors and general diseases (connective tissues diseases, S. Sjogren) on the lacrimal function and the conjunctival epithelium. We examined five groups: 276 normal …
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Perfil de eletrólitos e padrões de cristalização da lágrima de aves, répteis e humanos
To describe the electrolytes presented in tears of some species of birds and reptiles, and associate these values to the tear film crystallization pattern. Ten animals of each species: Ara ararauna, Amazona aestiva, Tyto alba, Rupornis magnirostris, Chelonoidis carbonaria and Caiman latirostris; …
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Imaging of Meibomian Glands in Various Species
… (MG) secrete meibum, the lipid component of the tear film essential for tear stability which is disrupted during dry eye disease. Blink rate varies across species suggesting differences in tear film stability, MG anatomy, and meibum quality. Meibography is performed on humans, but little is known …
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Effect of Diabetes Mellitus on Ocular Surface Tight Junctions and Glycocalyx
… on the conjunctival tight junction proteins, tear secretion and corneal glycocalyx.</p> <p><strong>Methods</strong>: Cultured human conjunctival epithelial cells were exposed to high glucose (15 mM and 30mM) concentrations for 24 and 72 hours. Trans-epithelial electrical resistance and scratch …
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Molecular Dynamics Simulations In The Study Of Biological Lipid Membranes
… the dynamics of lipid monolayers involved in the tear film lipid layer (eyes), where a new class of lipid is under investigation, and in pulmonary sufactant (lungs), which has been hypothesized to be inhibited by the presence of organic compounds in the vapors of electronic cigarettes. A …
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Avaliação da superfície ocular em pacientes com doença ocular da tireoide
… disorder characterised by an imbalance in tear film homeostasis, resulting from deficient tear production and/or excessive tear evaporation. In TED, the enlargement of the palpebral fissure, combined with eyelid changes and proptosis, results in increased corneal exposure, tear film …
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Wettability and hydrophilicity of rigid and soft contact lens surfaces
… values would be; if a material to spread tear break up time occurs the dry patches will be advanced on PMMA, rather than Paraperm contact lens. Surface hydrophilicity, if defined in terms of the maximum adherent force, describes the ability of a lens surface to attract a liquid, whereas …
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Intense Pulsed Light for the Treatment of Evaporative Dry Eye
… expression of neuroinflammatory biomarkers, 5) tear film lipidomics, 6) in vivo confocal microscopy and 7) lid margin microflora assessments. Results A total of 30 participants (70% female, mean ± SD age of 55 ± 14) were randomised to the placebo arm of the study, and 56 participants were …
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