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 23 for “"sclera"”.
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The hydrodynamic permeability of sclera
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Ultrastructural studies of cornea and sclera
… relationship. Intermolecular spacing in cornea, sclera and rat-tail tendon was shown to increase rapidly over the hydration range H=O to H≈1, then tan off (physiological hydration is at H=3.2). Intermolecular and interfibrillar spacings rise in unison over the hydration range H=O to H≈1, after …
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Continuous Monitoring of Intraocular Pressure from the Sclera
… a noninvasive strain gauge sensor, placed on the sclera, to detect changes in IOP. The specific aims are to provide proof-of-principle for a novel, scleral mounted device for measuring IOP by: (1) establishing whether IOP can be recorded from the conjunctival and scleral surface using enucleated …
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Ocular Iontophoresis of Nanocarriers for Sustained Drug Delivery to the Eye
<p>Transscleral iontophoresis has been shown as a viable modality to deliver therapeutic drugs for the treatment of eye diseases. Although several studies have been conducted to examine the utility of iontophoresis for both charged and neutral molecules, the understanding of the mechanisms …
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Part I: Effect of Nanomicelle Size on Trans-scleral Permeability of Dexamethasone and Part II: Strategies to Minimize Octreotide Acylation during Sustained Release from Biodegradable Polymers
… size on dexamethasone (DEX) transport across the sclera. Nanomicelles of various sizes were developed and characterized. Low molecular weight diblock co-polymers, mPEG₇₅₀-PCL₇₀₀ (DB1), mPEG₂₀₀₀-PCL₁₅₀₀ (DB2) and mPEG₅₀₀₀-PCL₄₀₀₀ (DB3) were synthesized by ring opening polymerization. Polymers were …
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Rheological Studies of Injectable Thermoresponsive Biodegradable Hydrogels and Porcine Ocular Tissues
… the shear properties of porcine cornea, sclera and vitreous under strain and frequency sweep. All three tissue types at different stages have shown linear viscoelastic region under strain sweep. The G´ of cornea and vitreous weakly varied between neonatal and preterm, however, the adult …
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Design of a Precision Needle for Injection of Fluid into the Suprachoroidal Space of the Eye for the Treatment of Retinal Detachment
… space, a “potential space” between the sclera and choroid, creating a “bleb” of fluid underneath the tear that pushes the choroid towards the retina and allows it to reattach. However, difficulty in safely injecting into this space at the location of the retinal tear currently limits the …
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Quantification of collagen fiber organization in biological tissues at cellular and molecular scales using second-harmonic generation imaging
… for three tissue types: porcine tendon, sclera, and ear cartilage. We find that both signal types yield consistent information on the preferred orientation of collagen fibers and several overlapping peaks in the magnitude spectrum for these tissues. This strengthens the application of …
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Segmentation and Feature Extraction Methods for Ocular Modalities
… unique texture pattern from Iris, Retina and Sclera. Based on uniqueness, universality and availability, ocular modalities can be potentially be used as biometric token. Iris biometrics is considered as the optimal solution with given image acquisition in near infrared environment. Iris …
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Design and construction of a novel transpalpebral ophthalmic tonometer
… consisting of concavation of the cornea or sclera through the palpebra superior by the spherical tip of an optoelectronic photodetector suspended in a force sensing probe. Three subjects participated in an experiment in which a prototype device was tested alongside traditional measurement …
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IN-VIVO SCLERAL AND CORNEAL BIOMECHANICS AS BIOMARKERS IN OPHTHALMIC PRACTICE
… determine material properties of the cornea and sclera.
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Quantifying collagen-based biological tissues using Fourier-transform-second-harmonic generation imaging
… biological tissues: porcine tendon, porcine sclera, and rat cervix.
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NONLOCAL AND NONLINEAR EFFECTS ON SOLAR OSCILLATIONS (RADIATIVE DAMPING, LIMB DARKENING).
… the solar limb darkening function undertaken at SCLERA (Santa Catalina Laboratory for Experimental Relativity). The coupling between the thermal and mechanical modes occur mainly due to the nonlocal nature of the radiation field. Previous theoretical calculations that used approximations for the …
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Gorilla Life-Stage Comparison of Head Orientation
… Due to the shape of the eye and the pigmented sclera in some primates, eye gaze can be difficult to determine, whereas, head orientation may be a more salient cue. The current study documents developmental differences among age-sex classes of captive western lowland gorillas (<em>Gorilla …
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Vascular changes in Alzheimer’s disease and other types of dementia in the retina of human and animal
… spherical structures within drusen, choroid and sclera and an intracellular labelling was detected in the inner layers of the human retina. Where Aβ accumulations were detected extracellularly in the human retina, these were in few areas. No increase in Aβ accumulations was seen in the retina of …
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Assessment of Ocular Accommodation in Humans
… was improved when using reference points on the sclera to align the AS-OCT scan. The use of a ciliary muscle area metric demonstrated poor repeatability and reliability when compared to the traditional assessment of muscle morphology via thickness measurements. Physiological ageing in the …
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Sutured posterior chamber intraocular lenses for traumatic cataract in Africa
… is contained. lntraocular lenses sutured to the sclera in the posterior chamber of the eye (SL TC - Sutured lenses for traumatic cataract) - in the natural position of the crystalline lens - is standard practice at Groote Schuur Hospital in selected patients. It is a difficult and intricate …
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The Multifunctional Melanocortin System in the Human Choroid
… in the eye located between the outer collagenous sclera and inner neural retina. The choroid stroma includes extracellular matrix, blood vessels, immune cells, nerves, fibroblasts, and melanocytes. As one of the most abundant cells within the choroid, melanocytes contribute significantly to the …
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Investigation of the role of Glil+ cells in retinal angiogenesis and fibrosis.
… days in the eye, predominantly in the choroid, sclera, cornea, and ciliary body, although the RPE layer appeared to be Gli1-tomato negative. Immunofluorescent staining displayed co-expression of Gli1-tomato with CD31+, NG2+, and Collagen 4+ retinal microvasculature. Fundus imaging of CNV lesions …
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The Use of Social Gaze Cues in Real World Scenes
… pupil highly-distinguishable against the white sclera, combined with our foveated vision, mean that gaze cues are both a means of understanding where attention is being allocated and a method for non-verbal communication. Previous attention research using gaze cues has focused on Posner-type …
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