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 102 for “"Ophthalmic"”.
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Transillumination techniques in ophthalmic imaging
… This thesis describes a pair of alternative ophthalmic imaging techniques based instead on transmitted light, which inherently avoids these artifacts. For retinal (i.e. fundus) imaging, we describe a mesoscopic transmission imaging method, which we call transcranial fundus imaging. The method …
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Synthetic polymers for ophthalmic applications
… and hitherto unexplored group of materials for ophthalmic applications. Consideration was similarly given to surface modification techniques that would produce materials having the ability to sustain coherent tear film in the eye without markedly impairing oxygen transport properties. Particular …
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Ophthalmic complications of spina bifida and hydrocephalus
… an attempt to further our knowledge of the ophthalmic complications of spina bifida and hydrocephalus by means of literature review and a long term clinical study, and to determine whether regular ophthalmic supervision can assist in the general management of affected children. The …
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Biocompatibility of an implantable ophthalmic drug delivery device
Diseases of the posterior eye present clinicians with a treatment challenge mainly due to the region's inaccessible location. Several drugs, including those available for the treatment of exudative age-related macular degeneration, are currently delivered by periodic injection into the eyeball. To …
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Extending the reach of anterior segment ophthalmic imaging
Eye exams via a slit lamp are critical in screening for conditions such as cataracts, corneal opacities and pterygia early on to avert vision loss. The slit lamp, however, is a purely qualitative optical device that is bulky, expensive, can cause eye discomfort due to light sensitivity. It also …
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Design and construction of a novel transpalpebral ophthalmic tonometer
… applanation tonometry which requires the use of ophthalmic anesthetics and complex diagnostic equipment- describes a novel lOP measurement method consisting of concavation of the cornea or sclera through the palpebra superior by the spherical tip of an optoelectronic photodetector suspended in a …
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Ultrahigh speed optical coherence tomography for ophthalmic imaging applications
… laser. Current standard commercial ophthalmic clinical systems based on SD-OCT technology have imaging speeds of 20,000 - 40,000 axial scans per second and axial resolutions of 5 - 7 ptm. In this thesis, ultrahigh speed OCT for ophthalmic imaging applications are presented. SD-OCT …
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High speed handheld instrument for ophthalmic optical coherence tomography
Optical coherence tomography (OCT) is a non-contact, high resolution biomedical imaging technique that uses low coherence interferometry to generate cross-sectional images of tissue. OCT has become a standard tool in ophthalmology for imaging the retina to detect or monitor pathologies. Recent …
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Advanced functional and intraoperative ophthalmic optical coherence tomography imaging
Optical coherence tomography (OCT) is a non-contact, non-invasive imaging technique that uses optical interferometry to generate high-resolution, depth-resolved images of tissue in vivo. Ophthalmologists now use commercial OCT systems as a standard diagnostic instrument for imaging the retina to …
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IN-VIVO SCLERAL AND CORNEAL BIOMECHANICS AS BIOMARKERS IN OPHTHALMIC PRACTICE
As the relationship between biomechanical properties and abnormal tissue mechanics become more and more apparent in the field of ophthalmology, demand for in-vivo determination of biomechanical properties have also increased. While devices like the Ocular Response Analyser (ORA) have made the …
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Development of Optical Coherence Tomography Systems for Ophthalmic Imaging and Intrasurgical Guidance
<p>Ophthalmic microsurgery is one of the most commonly performed surgical procedures in the world and it necessitates precise three-dimensional manipulation of tissue at sub-millimeter spatial scales. As a result, ophthalmic surgeons require an operating microscope to perform surgery and to asses …
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Photosensitizer Loaded Contact Lenses As An Externally Stimulated Ophthalmic Drug Delivery System
Ophthalmic administration of drugs is primarily associated with the treatment of ocular diseases. 90% of the ophthalmic dosage forms are given topically. However, following the topical route, only 5% ocular bioavailability is achieved. The aim of my work is to address the problems associated with …
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The Role of Wnt Signaling in Development of the Ophthalmic Trigeminal Placode.
… nervous system. The development of the ophthalmic trigeminal (opV) placode, which gives rise only to sensory neurons of the ophthalmic lobe of the trigeminal ganglion, is a well-studied model of sensory neuron development. While key differentiation processes have been characterized at …
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Pentablock copolymers based controlled release formulations of small and macromolecules for ophthalmic applications
Pentablock copolymers comprised of multi-polymer blocks such as polyethylene glycol (PEG), polycaprolactone (PCL) and poly-lactide (PLA) were developed for fabrication of nanoparticles and thermosensitive hydrogel formulations for long term delivery of small and macromolecules. Different pentablock …
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Graph Theory and Dynamic Programming Framework for Automated Segmentation of Ophthalmic Imaging Biomarkers
… diseases. Earlier and faster detection of ophthalmic imaging biomarkers also leads to optimal treatment and improved vision recovery. While modern optical imaging technologies such as optical coherence tomography (OCT) and adaptive optics (AO) have facilitated in vivo visualization of the …
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Robotics and Virtual Reality for Optical Coherence Tomography-Guided Ophthalmic Surgery and Diagnostics
… coherence tomography (OCT). Consequently, ophthalmic surgeons routinely face challenges in visualization and manipulation of small ocular tissues or in interpreting intraoperative imaging to guide their actions. This dissertation therefore seeks to advance the state-of-the-art in ophthalmic …
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Botulism and Its Ophthalmic Lesions as Determined by Research With the Toxin of Clostridium Botulinum
… extent or detail that has appeared in American ophthalmic literature. A brief resumé of the history and present status of the subject will serve as a prelude to the findings as discussed in this paper.
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Knowledge and practices of primary eye care among non-ophthalmic nurses working in Kweneng East District Clinics, Botswana.
… primary eye care knowledge and practices of non-ophthalmic nurses in Kweneng East District clinics, Botswana. Methodology: A descriptive cross-sectional study design, with quantitative methods of analysis was used. The study sample was selected using both systematic and convenience sampling …
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