نتایج جستجو برای: optic disc center detection
تعداد نتایج: 916926 فیلتر نتایج به سال:
ABSTRACT: Glaucoma is a chronic eye disease that leads to vision loss. Detecting glaucoma in time is critical. The symptoms of the glaucoma disease occur when it is in advanced stage. Hence, glaucoma is called the silent thief of sight. Detecting the disease in time is very important. In this project, an optic disc and optic cup segmentation is used to identify the glaucoma disease in time. In ...
Pathological optic disc cupping (ODC) is predominantly referred to as glaucoma; however, it is not only glaucoma that leads to pathological optic disc excavation. A number of other nonglaucomatous diseases also result in optic atrophy and excavation of the optic disc. Therefore, in the present study, the etiology of nonglaucomatous optic disc cupping (NGODC) was analyzed and differentiated from...
Damage to the optic nerve (e.g. from glaucoma) has an adverse and often irreversible impact on vision. Earlier studies have suggested that the size of the optic nerve head could be governed by hereditary factors. We conducted a genome-wide association study (GWAS) on 4445 Singaporean individuals (n = 2132 of Indian and n = 2313 of Malay ancestry, respectively), with replication in Rotterdam, th...
The association between post-traumatic optic disc pallor and traumatic choroidal rupture is poorly understood. To further define this relationship, nine cases of indirect traumatic choroidal rupture and post-traumatic optic disc pallor were compared with cases of indirect choroidal rupture without disc pallor in terms of severity of ocular injury, fundus findings, and visual outcome. The type a...
purpose: to evaluate the relationship between central corneal thickness (cct) and optic disc area in patients with primary open angle glaucoma (poag). methods: the study was performed on patients with poag who were being followed at johns hopkins hospital. all patients underwent thorough eye examination, optic disc imaging with the heidelberg retina tomograph ii (hrt ii), and ultrasound corneal...
Non-arteritic anterior ischaemic optic neuropathy (NAION) is a widespread visually disabling disease in the middleaged and elderly population. Based on clinical observations by Hayreh, Beck, Savino and others, a low cup/disc diameter ratio and a small optic disc have been described to be structural factors associated with the disease. The physiological correlation between disc size and cup/disc...
PURPOSE To evaluate which optic disc parameters are predictive factors for the development of disc hemorrhages in chronic open-angle glaucoma. METHODS The prospective comparative clinical observational study included 432 eyes of 281 white patients with chronic open-angle glaucoma. Mean follow-up time was 38.8 months (median, 31.5). Eyes in the whole study group were divided into those with an...
To recognize and to assess glaucomatous changes at the optic nerve, it is important to know the characteristics of the normal optic disc. As in the other biological variables, the appearance of the optic disc varies widely among healthy individuals. This fact is complicate the recognition of the pathological changes. ‘Optic Disc’ is frequently used to describe the portion of the optic nerve cli...
We describe a complete pipeline for the detection and accurate automatic segmentation of the optic disc in digital fundus images. This procedure provides separation of vascular information and accurate inpainting of vessel-removed images, symmetry-based optic disc localization, and fitting of incrementally complex contour models at increasing resolutions using information related to inpainted i...
PURPOSE To report the unknown coexistence of bilateral optic disc pit and keratoconus. METHODS A 23-year-old man with bilateral keratoconus underwent complete ophthalmology screening, with an unexpected detection of undiagnosed optic disc pit in both eyes. Computerized corneal topography (CT), Orbscan, corneal pachometry, endothelial microscopy, and optical coherence tomography (OCT) examinat...
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