What is physiologic Cup?
A depression in the center of the optic nerve through which the blood vessels pass; normal cup to disc ratios range from 0.3 to 0.5 of the disk diameter.
What is the normal physiologic Cup optic disc ratio?
The normal cup-to-disc ratio is less than 0.5. A large cup-to-disc ratio may imply glaucoma or other pathology.
Where is the physiological cup located?
the optic disc
The optic cup is the white, cup-like area in the center of the optic disc.
What does cupping mean in an eye exam?
The term cupping of the optic nerve describes the appearance of the optic nerve to the examining eye doctor. When the nerve is viewed through the pupil, it looks like a cup seen from above. The cup is really an empty space in the middle of the optic nerve surrounded by optic nerve fibers.
What causes physiological cupping?
Physiological cupping is a congenital disorder of optic cupping, which is caused by the scleral optic canal and pronounced glial atrophy of Bergmeister’s papilla. GODC is a type of ascending optic nerve atrophy that is associated with the loss of retinal ganglion cell axons.
Does cupping always mean glaucoma?
Up to 20% of nonglaucomatous cupping has been misdiagnosed and treated as glaucoma. Young age, pallor of the disc, loss of visual acuity and color vision, and a poor correlation between optic nerve and visual field findings are suggestive of a condition other than glaucoma.
What is the average optic cup size?
Measuring optic disk size is an essential part of the optic nerve head for evaluation for glaucoma. The average human optic disc dimensions are 1.88mm vertically by 1.77mm horizontally, and can be grouped by vertical diameter into small (1.2-1.7mm), average (1.87-1.96mm), and large (2.03-2.27mm) disc sizes [1].
What does a small cup-to-disc ratio mean?
Background: A small cup-to-disc (C:D) ratio is an established risk factor for nonarteritic anterior ischemic optic neuropathy. We sought to determine if a small C:D. ratio was present in patients with idiopathic intracranial hypertension (IIH) as a potential risk factor for visual loss in that disorder.
What is normal optic disc size?
What is cup-to-disc ratio in glaucoma?
The C/D ratio represents the depression in the optic disc in which neural tissue is absent and is compared to the overall optic disc size. Eyes that have glaucoma may have a small or large C/D ratio. Also, a larger C/D ratio has a greater risk for developing glaucoma. Large disc: This disc obeys the ISNT rule.
Can you be born with large optic nerves?
Some people have the appearance of glaucomatous cupping, but in reality have perfectly normal eyes. This is because some people are born with larger optic nerves … their “pipe” is very large with a lot of excess room inside of it that gives the illusion of nerve loss, but in reality they are perfectly healthy.
What disorder would cause cupping of the optic disc?
OPTIC DISC CUPPING. A hallmark of glaucoma is excavation or enlargement of the optic disc, referred to as cupping. The vast majority of pathologic cupping is caused by glaucoma. Disc cupping in the absence of elevated IOP may be caused by normal-tension glaucoma, which accounts for 20% to 30% of open-angle glaucoma.
What is the physiological Cup in anatomy?
physiological cup. Also found in: Dictionary, Thesaurus, Legal, Financial, Encyclopedia. A depression in the center of the optic nerve through which the blood vessels pass; normal cup to disc ratios range from 0.3 to 0.5 of the disk diameter.
What is the normal Cup to disc ratio?
A depression in the center of the optic nerve through which the blood vessels pass; normal cup to disc ratios range from 0.3 to 0.5 of the disk diameter.
What is the cup of the optic disc?
cup, physiological A funnel-shaped depression at or near the centre of the optic disc through which pass the central retinal vessels. Syn. optic cup (although it would be preferable not to use this synonym since this term has another meaning); physiological excavation. See cupped disc; neuroretinal rim.
What is a Cup in the optic nerve?
A depression in the center of the optic nerve through which the blood vessels pass; normal cup to disc ratios range from 0.3 to 0.5 of the disk diameter. cup, physiological. A funnel-shaped depression at or near the centre of the optic disc through which pass the central retinal vessels.