b) There is significant thinning of the neuroretinal rim
, particularly supero-temporally
The glaucoma module of the Spectralis SD-OCT device (software version 6.0; Heidelberg Engineering GmbH, Heidelberg, Germany) evaluates the neuroretinal rim
by automatically determining the shortest distance from the inner rim of the BMO to the internal limiting membrane as a reference and measuring RNFL thickness (Figure 5).
This cell loss leads to structural damage that includes a progressive regional or diffuse thinning of both the retinal nerve fiber layer (RNFL) and the neuroretinal rim
within the optic nerve head (ONH), followed by functional loss, as shown by progressive visual field defects .
Optic disc morphology differed significantly between the eyes with POAG and NAION by a higher rate of neuroretinal rim
thinning and higher mean cup depth in the POAG group.
He walks readers through optic disk size and shape; optic cup shape and depth; optic cup size in relation to the optic disc size; neuroretinal rim
size, shape and perfusion; central retinal vessel trunk location; optic disc hemorrhages; parapapillary chorioretinal atrophy; retinal arteriole diameter; and retinal nerve fiber layer defects.
Visual fields on the Humphrey 24-2 automated analyser were normal and cup-to-disc ratios were 0.5 each, with healthy neuroretinal rim
Optic neuropathy was defined as a vertical cup-to-disc ratio (CDR) [greater than or equal to] 0.7 or asymmetry [greater than or equal to] 0.2 or neuroretinal rim
width reduced to [less than or equal to] 0.1 CDR.
In 2-D fundus image the optic disc region was divided into two regions the centre bright region called optic cup and the outer peripheral region called the neuroretinal rim
Optic Nerve Head Neuroretinal Rim
Blood Flow Differences In: Monkeys with Laser Induced Glaucoma.
Optical coherence tomography (OCT; Cirrus HD-OCT, Zeiss, Meditec, CA; retinal nerve fiber layer (RNFL) and optic nerve head test) showed an asymmetry in findings of the right and left eye, with the preservation of RNFL thickness, the neuroretinal rim
thickened on the right eye due to extravasation and accumulation of fluid (Right eye Avg.
Frequencies and percentages of the contour of neuroretinal rim
, appearance of nerve fiber layer, presence of optic disc hemorrhages, colour of optic nerve head was noted.
* bayonetting sign (characterised by double angulation of a blood vessel over the edge of the disc): with neuroretinal rim
loss between the outer edge of the cup and the optic disc margin, a vessel entering the disc from the retina may angle sharply backwards into the disc and then turn towards the original direction