Glaucoma is the second leading cause of loss of vision in the world. Examining the head of optic nerve (cup-to-disc ratio) is very important for diagnosing glaucoma and for patient monitoring after diagnosis. Images of optic disc and optic cup are acquired by fundus camera as well as Optical Coherence Tomography. The optic disc and optic cup segmentation techniques are used to isolate the relev...

We report a case of bilateral uveitis and optic disc swelling with Chiari I malformation. A 16-year-old girl was admitted to our clinic due to conjunctival hyperaemia and blurred vision in her right eye. Ophthalmologic and systemic examinations were performed. Visual acuity was 0.7 (OD) and 1.0 (OS). Bilateral optic disc swelling was observed. Fluorescein angiography demonstrated bilateral reti...

Glaucoma is a chronic eye disease that leads to vision loss. As it cannot be cured, detecting the disease in time is important. This research proposes optic disc and optic cup segmentation using superpixel classification for glaucoma screening. It uses the 2D fundus images. In optic disc segmentation, clustering algorithms are used to classify each superpixel as disc or nondisc. For optic cup s...

AIM To evaluate and compare four different mathematical formulas for the early detection of morphometric optic nerve head changes in chronic open angle glaucoma. METHODS The optic nerve heads of 161 patients with perimetrically defined glaucomatous optic nerve damage and of 194 normal subjects were examined by confocal laser scanning tomography. Using four formulas of linear discriminant anal...

The location of the optic disc is of critical importance in retinal image analysis. We improve on past approaches on optic disc detection by working in colour space and also by localising accurately the optic disc boundary using an automatically initialised snake. The key issue presented is a comparison of colour spaces for performing colour morphology to remove blood vessels and prepare the im...

ANTERIOR ISCHEMIC OPTIC NEUROPATHY (AION) Perioperative Arteritic Anterior Ischemic Optic Neuropathy (AAION) Hypotension Nonarteritic Anterior Ischemic Optic Neuropathy (NAION) RADIATION OPTIC NEUROPATHY POSTERIOR ISCHEMIC OPTIC NEUROPATHY ISCHEMIC OPTIC DISC EDEMA WITH MINIMAL ISCHEMIC OPTIC NEUROPATHY IN SETTINGS OF DYSFUNCTION HEMODYNAMIC COMPROMISE Pre-AION Optic Disc Edema Spontaneous or T...

EDITOR,—Doubling of the optic disc is rare and can manifest as true or pseudo doubling. A 64 year old man was referred by his physician who noted “a clear area between each optic disc on both sides” during a routine check. Visual acuities and anterior segments were normal. Funduscopy revealed an appearance simulating double optic discs on each side. The right eye showed a 2 disc diameter (DD) s...

BACKGROUND Recent reports indicate that eyes with normal pressure glaucoma have larger optic discs than eyes with primary open angle glaucoma or normal eyes. This study was performed to find whether, in normal pressure glaucoma, a large disc is associated with more optic nerve damage than a small disc. METHODS Colour optic disc photographs of 74 patients with normal pressure glaucoma were ass...

We cross-sectionally examined the relationship between age, optic disc area, refraction, and gender and optic disc topography and retinal nerve fiber layer (RNFL) measurements, using optical imaging techniques. One eye from each of 155 Caucasian subjects (age range 23.0-80.8 y) without ocular pathology was included. Measurements were obtained by using the Heidelberg Retina Tomography (HRT), the...

Presented are the methods proposed by authors to identify and model the optic disc in colour retinal images. The first three our approaches localized the optic disc in two steps: a) in the green component of RGB image the optic disc area is detected based on texture indicators and pixel intensity variance analysis; b) on the segmented area the optic disc edges are extracted and the resulted bou...