PURPOSE The parapapillary gamma zone has been defined as the parapapillary region without Bruch's membrane. We examined which morphologic parameters are associated with the presence and size of the parapapillary gamma zone. METHODS Using fundus photographs and spectral-domain optical coherence tomographic images of the optic nerve head in the population-based Beijing Eye Study, we determined ...

PURPOSE To investigate the effect of systemic nitric oxide synthase (NOS) inhibition on optic disc oxygen partial pressure (PO(2)) in normoxia and hypercapnia. METHODS Intervascular optic disc PO(2) was measured in 12 anesthetized minipigs by using oxygen-sensitive microelectrodes placed <50 microm from the optic disc. PO(2) was measured continuously during 10 minutes under normoxia, hyperoxi...

In recent days, detecting Optic Disc (OD) in retinal images has been challenging and very important to the early diagnosis of eye diseases. The process OD is due diversity color, intensity, brightness shape OD. Moreover, color similarities neighboring organs create difficulties during detection. proposed Fuzzy K‒Means Threshold (FKMT) Morphological Operation with Pixel Density Feature (MOPDF), ...

AIMS Progressive loss of neuroretinal rim tissue is known to occur early in glaucoma and measurement of the neuroretinal rim area is possible by magnification corrected analysis of optic disc photographs (planimetry). This study was performed to determine whether the facility to distinguish between glaucomatous and normal optic discs could be improved upon by: (a) taking into account the known ...

Optic disk detection on retina image has become one of many initial steps in evaluation Diabetic Macular Edema (DME) severity. As much as early the step is, result is extremely essential. This article discusses optic based color histogram value. The done by using value which taken from window sliding process with size 50x50 pixels. First, candidates disc were detected Extreme Learning Machine t...

PURPOSE To document and explain the presence, inferior to the optic disc, of a distinct vertical boundary between two retinal areas of different short-wavelength autofluorescence (SW-AF) intensities. METHODS SW-AF images of the inferonasal region were acquired from 32 healthy subjects. Additionally, color, 488-nm reflectance (488-R), near-infrared reflectance (NIR-R), NIR autofluorescence (NI...

we evaluated the ability of spectral-domain optic coherence tomography (sd-oct) to differentiate large physiological optic disc cupping (lpc) from glaucomatous cupping in eyes with intraocular pressure (iop) within the normal range.â  we prospectively enrolled patients with glaucoma or presumed lpc. participants â had optic discs with confirmed or suspected glaucomatous damage (defined as a ver...