WebNational Center for Biotechnology Information WebFeb 7, 2024 · The pale colour of the cup is due to the absence of neuroretinal tissue. The vertical size of the cup can be estimated in relation to the optic disc as a whole, known as the “cup-to-disc ratio”. A cup-to-disc ratio of 0.3 (i.e. the cup occupies one-third of the height of the optic disc) is generally considered normal. An increased cup-to ...
Glaucoma: Disc and RNFL assessment Flashcards Quizlet
WebThe cup-to-disc (CD) ratio evaluated using stereoscopic biomicroscopy was compared with that evaluated by viewing a non-stereo digital image of the optic nerve head. Twenty normal subjects (mean age 26 +/- 4 years) were evaluated by two observers. The average CD ratio was 0.29 with a range of 0-0.80 … WebThe optic disc in a normal human eye carries 1–1.2 million afferent nerve fibers from the eye towards the brain. Structure [ edit] The optic disc is placed 3 to 4 mm to the nasal side of the fovea. It is a vertical oval, with average dimensions of 1.76mm horizontally by … cultural attraction theory
Cup-to-Disc Ratio - an overview ScienceDirect Topics
WebJan 20, 2024 · The left side of this slide shows a cup-todisc ratio of 0.9 and the right side shows a cup-to-disc ratio of 0.7. Significant asymmetric cupping of the optic discs, as … WebOptic Nerve Anatomy The optic nerve (optic disc, optic disk, optic nerve head [ONH]) area is approximately 2.1-2.8 mm2in whites who are not highly myopic depending on the measurement method utilized. The optic nerve size changes in … WebUsing this equation, the sensitivity and specificity of the CDR to identify glaucomatous discs was 62.3% and 98.9% respectively. This compares with the cut off of the upper 97.5 percentile (0.682) which gives a sensitivity of 56.6% and specificity of 97.7%. The sensitivity and specificity for different cut off values of CDR is shown in Table 2. eastland church of christ louisville ky