WebAs ratio of cup diameter to disc diameter, the cup-to-disc ratios depend on the size of the optic disc and cup. The high inter-individual variability of the optic disc and cup diameters … WebJun 15, 2005 · A C/D ratio between 0.4 and 0.8 can characterize a patient with a normal optic disc (i.e., physiologic cupping), a glaucoma suspect or someone with early to …
Variations of Cup-to-Disc Ratio in Children
WebDec 14, 2024 · Optic nerve cupping or enlargement of the cup-to-disc ratio is widely recognized as a feature of glaucoma, however it may also occur in non-glaucomatous optic neuropathies. The most well-recognized non-glaucomatous optic neuropathies that cause cupping include compressive optic neuropathies, arteritic anterior ischemic optic … WebSTEP ONE: THE OPTIC NERVE EXAM. Clinically measure the size of the optic disc. You may use the 5-degree aperture of a Welch Allyn direct ophthalmoscope, which is approximately 1.5 millimeters in diameter. A normal optic nerve approximates 1.7 to … pictures of place settings
Glaucomatous atrophy [cupping] of optic disc - ICD-9 Data.com
The cup-to-disc ratio (often notated CDR) is a measurement used in ophthalmology and optometry to assess the progression of glaucoma. The optic disc is the anatomical location of the eye's "blind spot", the area where the optic nerve leave and blood vessels enter the retina. The optic disc can be flat or it can have a certain amount of normal cupping. But glaucoma, which is in most cases associated with an increase in intraocular pressure, often produces additional pathological cuppi… WebThe high inter-individual variability of the optic disc and cup diameters determines that the cup-to-disc ratios range in a normal population between 0.0 and almost 0.9. Due to the correlation between disc area and cup area, they are low in small optic nerve heads, and they are high in large optic discs. An unusually high cup-to-disc ratio ... http://www.icd9data.com/2012/Volume1/320-389/360-379/377/377.14.htm top in 60652 dishwasher